<gallery>优化裁剪功能：更新颜色拾取逻辑、同步工具栏图标、调整布局文件

- 添加信息按钮和对话框，显示画布、颜色、裁剪信息
- 显示裁剪结果预览图和拾取坐标
- 松开手指时重置拾取按钮状态

gallery/build.gradle

@@ -109,7 +109,7 @@ dependencies {
 	*/
 	// WinBoLL库 nexus.winboll.cc 地址
 	api 'cc.winboll.studio:libaes:15.15.9'
-    api 'cc.winboll.studio:libappbase:15.15.19'
+    api 'cc.winboll.studio:libappbase:15.15.21'
 	
 	// WinBoLL备用库 jitpack.io 地址
 	//api 'com.github.ZhanGSKen:AES:aes-v15.15.7'

gallery/build.properties

@@ -1,8 +1,8 @@
 #Created by .winboll/winboll_app_build.gradle
-#Sun Apr 26 11:32:37 HKT 2026
+#Tue Apr 28 19:41:44 CST 2026
-stageCount=6
+stageCount=10
 libraryProject=
 baseVersion=15.0
-publishVersion=15.0.5
+publishVersion=15.0.9
-buildCount=0
+buildCount=11
-baseBetaVersion=15.0.6
+baseBetaVersion=15.0.10

gallery/src/main/AndroidManifest.xml

@@ -46,6 +46,14 @@
         <activity
             android:name=".TrashActivity"
             android:label="@string/trash"/>
+            
+        <activity
+            android:name=".CropActivity"
+            android:label="调整封面"/>
+        
+        <activity
+            android:name=".AboutActivity"
+            android:label="@string/about"/>
 
         <meta-data
             android:name="android.max_aspect"

gallery/src/main/java/cc/winboll/studio/gallery/AboutActivity.java

@@ -0,0 +1,51 @@
+package cc.winboll.studio.gallery;
+
+import android.os.Bundle;
+import android.view.View;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.appcompat.widget.Toolbar;
+import cc.winboll.studio.libappbase.LogUtils;
+import cc.winboll.studio.libappbase.models.APPInfo;
+import cc.winboll.studio.libappbase.views.AboutView;
+
+public class AboutActivity extends AppCompatActivity {
+
+    public static final String TAG = "AboutActivity";
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_about);
+
+        Toolbar toolbar = findViewById(R.id.toolbar);
+        setSupportActionBar(toolbar);
+        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
+        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                finish();
+            }
+        });
+
+        AboutView aboutView = findViewById(R.id.aboutview);
+        aboutView.setAPPInfo(genDefaultAppInfo());
+    }
+
+    private APPInfo genDefaultAppInfo() {
+        LogUtils.d(TAG, "genDefaultAppInfo() 调用");
+        String branchName = "gallery";
+        APPInfo appInfo = new APPInfo();
+        appInfo.setAppName("Gallery");
+        appInfo.setAppIcon(R.drawable.ic_winboll);
+        appInfo.setAppDescription(getString(R.string.app_description));
+        appInfo.setAppGitName("WinBoLL");
+        appInfo.setAppGitOwner("Studio");
+        appInfo.setAppGitAPPBranch(branchName);
+        appInfo.setAppGitAPPSubProjectFolder(branchName);
+        appInfo.setAppHomePage("https://www.winboll.cc/apks/index.php?project=Gallery");
+        appInfo.setAppAPKName("Gallery");
+        appInfo.setAppAPKFolderName("Gallery");
+        LogUtils.d(TAG, "genDefaultAppInfo: 应用信息已生成");
+        return appInfo;
+    }
+}

gallery/src/main/java/cc/winboll/studio/gallery/AlbumActivity.java

@@ -240,4 +240,12 @@ private String getSortOrder(int sortMode) {
             adapter.refreshBg();
         }
     }
+    
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
+        super.onActivityResult(requestCode, resultCode, data);
+        if (requestCode == 100 && resultCode == RESULT_OK) {
+            loadImages();
+        }
+    }
 }

gallery/src/main/java/cc/winboll/studio/gallery/AlbumAdapter.java

@@ -26,6 +26,8 @@ public class AlbumAdapter extends RecyclerView.Adapter<AlbumAdapter.ViewHolder>
     private Preferences prefs;
     private int bgType = 0;
     private PinnedAlbumDbHelper pinnedDbHelper;
+    private OnCoverSizeListener coverSizeListener;
+    private boolean coverSizeReported = false;
     
     private int getBgRes() {
         switch (bgType) {
@@ -43,10 +45,21 @@ public class AlbumAdapter extends RecyclerView.Adapter<AlbumAdapter.ViewHolder>
     public interface OnAlbumClickListener {
         void onAlbumClick(Album album);
     }
-
+    
+    public interface OnCoverSizeListener {
+        void onCoverSize(int width, int height);
+    }
+    
+    public static final int DEFAULT_COVER_WIDTH = 240;
+    public static final int DEFAULT_COVER_HEIGHT = 120;
+    
     public void setOnAlbumClickListener(OnAlbumClickListener listener) {
         this.listener = listener;
     }
+    
+    public void setOnCoverSizeListener(OnCoverSizeListener listener) {
+        this.coverSizeListener = listener;
+    }
 
     public void setData(ArrayList<Album> albums) {
         this.albums = sortAlbums(albums);
@@ -84,6 +97,10 @@ public class AlbumAdapter extends RecyclerView.Adapter<AlbumAdapter.ViewHolder>
         notifyDataSetChanged();
     }
     
+    public void refreshCover() {
+        notifyDataSetChanged();
+    }
+    
     public void refreshPinned() {
         if (pinnedDbHelper != null && albums != null && !albums.isEmpty()) {
             ArrayList<Album> pinned = new ArrayList<>();
@@ -162,6 +179,29 @@ private void showContextMenu(View view, final Album album) {
         holder.albumName.setText(album.getName());
         holder.imageCount.setText(album.getImageCount() + " photos");
         
+        holder.itemView.post(new Runnable() {
+            @Override
+            public void run() {
+                if (!coverSizeReported && prefs != null) {
+                    int savedWidth = prefs.getCoverWidth();
+                    if (savedWidth == AlbumAdapter.DEFAULT_COVER_WIDTH) {
+                        int width = holder.coverImage.getWidth();
+                        int height = holder.coverImage.getHeight();
+                        if (width > 0 && height > 0) {
+                            prefs.setCoverWidth(width);
+                            prefs.setCoverHeight(height);
+                            float ratio = (float) width / height;
+                            prefs.setCoverRatio(ratio);
+                            coverSizeReported = true;
+                            if (coverSizeListener != null) {
+                                coverSizeListener.onCoverSize(width, height);
+                            }
+                        }
+                    }
+                }
+            }
+        });
+        
         holder.itemView.setOnClickListener(new OnClickListener() {
             @Override
             public void onClick(View v) {
@@ -176,37 +216,22 @@ private void showContextMenu(View view, final Album album) {
             String uriString = coverUri.toString();
             LogUtils.d(TAG, "uri scheme: " + coverUri.getScheme() + ", path: " + uriString);
             
-            // For content:// URIs, try to get the actual file path
+            if ("file".equals(coverUri.getScheme())) {
-            if ("content".equals(coverUri.getScheme())) {
+                File coverFile = new File(coverUri.getPath());
-                try {
+                if (coverFile.exists()) {
-                    android.database.Cursor cursor = holder.coverImage.getContext().getContentResolver()
+                    Glide.with(holder.coverImage.getContext())
-                        .query(coverUri, new String[]{MediaStore.Images.Media.DATA}, null, null, null);
+                        .load(coverFile)
-                    if (cursor != null && cursor.moveToFirst()) {
+                        .fitCenter()
-                        int dataColumn = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
+                        .into(holder.coverImage);
-                        String filePath = cursor.getString(dataColumn);
+                    return;
-                        cursor.close();
-                        if (filePath != null) {
-                            File actualFile = new File(filePath);
-                            LogUtils.d(TAG, "actual file: " + actualFile.getAbsolutePath() + ", exists=" + actualFile.exists());
-                            // Use file path instead of content URI for better compatibility
-                            Glide.with(holder.coverImage.getContext())
-                                .load(actualFile)
-                                .centerCrop()
-                                .into(holder.coverImage);
-                            return;
-                        }
-                    }
-                } catch (Exception e) {
-                    LogUtils.e(TAG, "query error: " + e.getMessage());
                 }
             }
+            
+            Glide.with(holder.coverImage.getContext())
+                .load(coverUri)
+                .fitCenter()
+                .into(holder.coverImage);
         }
-        
-        // Fallback to content URI
-        Glide.with(holder.coverImage.getContext())
-            .load(coverUri)
-            .centerCrop()
-            .into(holder.coverImage);
     }
 
     @Override

gallery/src/main/java/cc/winboll/studio/gallery/AlbumCoverDbHelper.java

@@ -10,14 +10,16 @@ import cc.winboll.studio.libappbase.LogUtils;
 public class AlbumCoverDbHelper extends SQLiteOpenHelper {
     public static final String TAG = "AlbumCoverDbHelper";
     private static final String DB_NAME = "album_cover.db";
-    private static final int DB_VERSION = 1;
+    private static final int DB_VERSION = 2;
     private static final String TABLE_NAME = "album_covers";
     private static final String COLUMN_ALBUM_PATH = "album_path";
     private static final String COLUMN_IMAGE_PATH = "image_path";
+    private static final String COLUMN_CROP_PATH = "crop_path";
     
     private static final String SQL_CREATE = "CREATE TABLE " + TABLE_NAME + " (" 
         + COLUMN_ALBUM_PATH + " TEXT PRIMARY KEY, "
-        + COLUMN_IMAGE_PATH + " TEXT)";
+        + COLUMN_IMAGE_PATH + " TEXT, "
+        + COLUMN_CROP_PATH + " TEXT)";
     
     private static AlbumCoverDbHelper dbHelper;
     
@@ -39,8 +41,24 @@ public class AlbumCoverDbHelper extends SQLiteOpenHelper {
     
     @Override
     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
-        db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
+        if (oldVersion < 2) {
-        onCreate(db);
+            try {
+                db.execSQL("ALTER TABLE " + TABLE_NAME + " ADD COLUMN " + COLUMN_CROP_PATH + " TEXT");
+            } catch (Exception e) {
+                db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
+                onCreate(db);
+            }
+        }
+    }
+    
+    public void setCoverWithCrop(String albumPath, String imagePath, String cropPath) {
+        SQLiteDatabase db = getWritableDatabase();
+        ContentValues values = new ContentValues();
+        values.put(COLUMN_ALBUM_PATH, albumPath);
+        values.put(COLUMN_IMAGE_PATH, imagePath);
+        values.put(COLUMN_CROP_PATH, cropPath);
+        db.insertWithOnConflict(TABLE_NAME, null, values, SQLiteDatabase.CONFLICT_REPLACE);
+        LogUtils.d(TAG, "setCoverWithCrop: album=" + albumPath + ", image=" + imagePath + ", crop=" + cropPath);
     }
     
     public void setCover(String albumPath, String imagePath) {
@@ -54,21 +72,60 @@ public class AlbumCoverDbHelper extends SQLiteOpenHelper {
     
     public String getCover(String albumPath) {
         SQLiteDatabase db = getReadableDatabase();
-        Cursor cursor = db.query(TABLE_NAME, new String[]{COLUMN_IMAGE_PATH}, 
+        Cursor cursor = db.query(TABLE_NAME, new String[]{COLUMN_CROP_PATH, COLUMN_IMAGE_PATH}, 
             COLUMN_ALBUM_PATH + " = ?", new String[]{albumPath}, null, null, null);
         String coverPath = null;
         if (cursor != null) {
             if (cursor.moveToFirst()) {
                 coverPath = cursor.getString(0);
+                if (coverPath == null) {
+                    coverPath = cursor.getString(1);
+                }
             }
             cursor.close();
         }
         return coverPath;
     }
     
+    public String getCropPath(String albumPath) {
+        SQLiteDatabase db = getReadableDatabase();
+        Cursor cursor = db.query(TABLE_NAME, new String[]{COLUMN_CROP_PATH}, 
+            COLUMN_ALBUM_PATH + " = ?", new String[]{albumPath}, null, null, null);
+        String cropPath = null;
+        if (cursor != null) {
+            if (cursor.moveToFirst()) {
+                cropPath = cursor.getString(0);
+            }
+            cursor.close();
+        }
+        return cropPath;
+    }
+    
+    public String getOriginalImagePath(String albumPath) {
+        SQLiteDatabase db = getReadableDatabase();
+        Cursor cursor = db.query(TABLE_NAME, new String[]{COLUMN_IMAGE_PATH}, 
+            COLUMN_ALBUM_PATH + " = ?", new String[]{albumPath}, null, null, null);
+        String imagePath = null;
+        if (cursor != null) {
+            if (cursor.moveToFirst()) {
+                imagePath = cursor.getString(0);
+            }
+            cursor.close();
+        }
+        return imagePath;
+    }
+    
     public void clearCover(String albumPath) {
         SQLiteDatabase db = getWritableDatabase();
-        db.delete(TABLE_NAME, COLUMN_ALBUM_PATH + " = ?", new String[]{albumPath});
+        ContentValues values = new ContentValues();
+        values.putNull(COLUMN_CROP_PATH);
+        db.update(TABLE_NAME, values, COLUMN_ALBUM_PATH + " = ?", new String[]{albumPath});
         LogUtils.d(TAG, "clearCover: " + albumPath);
     }
+    
+    public void deleteCover(String albumPath) {
+        SQLiteDatabase db = getWritableDatabase();
+        db.delete(TABLE_NAME, COLUMN_ALBUM_PATH + " = ?", new String[]{albumPath});
+        LogUtils.d(TAG, "deleteCover: " + albumPath);
+    }
 }

gallery/src/main/java/cc/winboll/studio/gallery/CropActivity.java

@@ -0,0 +1,327 @@
+package cc.winboll.studio.gallery;
+
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.RectF;
+import android.graphics.drawable.GradientDrawable;
+import android.net.Uri;
+import android.os.Bundle;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.RectF;
+import android.net.Uri;
+import android.os.Bundle;
+import android.provider.MediaStore;
+import android.view.View;
+import android.widget.ImageView;
+import android.widget.ScrollView;
+import android.widget.SeekBar;
+import android.widget.TextView;
+import android.widget.Toast;
+import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.app.AppCompatActivity;
+import cc.winboll.studio.libappbase.LogUtils;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+
+public class CropActivity extends AppCompatActivity {
+    public static final String TAG = "CropActivity";
+    public static final String EXTRA_IMAGE_URI = "image_uri";
+    public static final String EXTRA_IMAGE_PATH = "image_path";
+    public static final String EXTRA_ALBUM_PATH = "album_path";
+    public static final String EXTRA_CROP_WIDTH = "crop_width";
+    public static final String EXTRA_CROP_HEIGHT = "crop_height";
+    
+    private CropCanvasView cropCanvasView;
+    private ZoomContainerView zoomContainer;
+    private Bitmap originalBitmap;
+    private String imagePath;
+    private String albumPath;
+    private int cropWidth = 240;
+    private int cropHeight = 120;
+    private float cropRatio = 2.0f;
+    
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_crop);
+        
+        imagePath = getIntent().getStringExtra(EXTRA_IMAGE_PATH);
+        albumPath = getIntent().getStringExtra(EXTRA_ALBUM_PATH);
+        cropWidth = getIntent().getIntExtra(EXTRA_CROP_WIDTH, 240);
+        cropHeight = getIntent().getIntExtra(EXTRA_CROP_HEIGHT, 120);
+        
+        Preferences prefs = new Preferences(this);
+        if (cropWidth > 0 && cropHeight > 0) {
+            cropRatio = (float) cropWidth / cropHeight;
+        } else {
+            cropRatio = prefs.getCoverRatio();
+            cropWidth = (int) (120 * cropRatio);
+            cropHeight = 120;
+        }
+        
+        findViewById(R.id.btn_close).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                finish();
+            }
+        });
+        
+        final ImageView btnColorPick = findViewById(R.id.btn_color_pick);
+        btnColorPick.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                boolean pickMode = !cropCanvasView.isColorPickMode();
+                cropCanvasView.setColorPickMode(pickMode);
+                btnColorPick.setAlpha(pickMode ? 0.5f : 1.0f);
+            }
+        });
+        
+        findViewById(R.id.btn_done).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                saveCroppedCover();
+            }
+        });
+        
+        findViewById(R.id.btn_info).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                showCropInfoDialog();
+            }
+        });
+        
+        zoomContainer = findViewById(R.id.zoom_container);
+        
+        SeekBar seekBarZoom = findViewById(R.id.seekbar_zoom);
+        seekBarZoom.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
+            @Override
+            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
+                if (zoomContainer != null && fromUser) {
+                    float scale = 0.1f + (progress / 100f) * 4.9f;
+                    zoomContainer.setScaleFactor(scale);
+                }
+            }
+            
+            @Override
+            public void onStartTrackingTouch(SeekBar seekBar) {}
+            
+            @Override
+            public void onStopTrackingTouch(SeekBar seekBar) {}
+        });
+        
+        cropCanvasView = findViewById(R.id.crop_canvas_view);
+        
+        final View colorView = findViewById(R.id.color_view);
+        final GradientDrawable colorDrawable = (GradientDrawable) colorView.getBackground();
+        cropCanvasView.setOnBackgroundColorChangedListener(new CropCanvasView.OnBackgroundColorChangedListener() {
+            @Override
+            public void onBackgroundColorChanged(int color) {
+                colorDrawable.setColor(color);
+            }
+        });
+        
+        cropCanvasView.setOnColorPickedListener(new CropCanvasView.OnColorPickedListener() {
+            @Override
+            public void onColorPicked(int color) {
+                int pickX = cropCanvasView.getLastPickImageX();
+                int pickY = cropCanvasView.getLastPickImageY();
+                colorDrawable.setColor(color);
+                Toast.makeText(CropActivity.this, 
+                    "颜色已拾取: #" + String.format("%06X", color & 0xFFFFFF) + 
+                    " (" + pickX + "," + pickY + ")", 
+                    Toast.LENGTH_SHORT).show();
+            }
+        });
+        
+        cropCanvasView.setOnColorPickEndListener(new CropCanvasView.OnColorPickEndListener() {
+            @Override
+            public void onColorPickEnd() {
+                cropCanvasView.setColorPickMode(false);
+                btnColorPick.setAlpha(1.0f);
+            }
+        });
+        
+        colorDrawable.setColor(cropCanvasView.getBackgroundColor());
+        
+        loadImage();
+    }
+    
+    private void loadImage() {
+        try {
+            if (imagePath != null && new File(imagePath).exists()) {
+                originalBitmap = BitmapFactory.decodeFile(imagePath);
+            } else {
+                Uri imageUri = getIntent().getParcelableExtra(EXTRA_IMAGE_URI);
+                if (imageUri != null) {
+                    originalBitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), imageUri);
+                }
+            }
+            
+            if (originalBitmap != null) {
+                cropCanvasView.setImageBitmap(originalBitmap);
+                cropCanvasView.post(new Runnable() {
+                    @Override
+                    public void run() {
+                        initCrop();
+                    }
+                });
+            } else {
+                Toast.makeText(this, "Failed to load image", Toast.LENGTH_SHORT).show();
+                finish();
+            }
+        } catch (Exception e) {
+            LogUtils.e(TAG, "loadImage error: " + e.getMessage());
+            Toast.makeText(this, "Failed to load image", Toast.LENGTH_SHORT).show();
+            finish();
+        }
+    }
+    
+    private void initCrop() {
+        cropCanvasView.initCanvas(originalBitmap.getWidth(), originalBitmap.getHeight(), cropRatio);
+        
+        int viewW = cropCanvasView.getWidth();
+        int viewH = cropCanvasView.getHeight();
+        if (viewW > 0 && viewH > 0) {
+            cropCanvasView.scaleToView(viewW, viewH);
+        }
+    }
+    
+    private void saveCroppedCover() {
+        if (originalBitmap == null || originalBitmap.isRecycled()) {
+            Toast.makeText(this, "Failed to get image", Toast.LENGTH_SHORT).show();
+            return;
+        }
+        
+        try {
+            Bitmap canvasBitmap = cropCanvasView.getCanvasBitmap();
+            if (canvasBitmap == null || canvasBitmap.isRecycled()) {
+                Toast.makeText(this, "Failed to get canvas bitmap", Toast.LENGTH_SHORT).show();
+                return;
+            }
+            
+            RectF cropRect = cropCanvasView.getCropRect();
+            
+            int bmpX = (int) cropRect.left;
+            int bmpY = (int) cropRect.top;
+            int bmpW = (int) cropRect.width();
+            int bmpH = (int) cropRect.height();
+            
+            bmpX = Math.max(0, Math.min(bmpX, canvasBitmap.getWidth() - 1));
+            bmpY = Math.max(0, Math.min(bmpY, canvasBitmap.getHeight() - 1));
+            bmpW = Math.max(1, Math.min(bmpW, canvasBitmap.getWidth() - bmpX));
+            bmpH = Math.max(1, Math.min(bmpH, canvasBitmap.getHeight() - bmpY));
+            
+            LogUtils.d(TAG, "saveCroppedCover: cropRect=" + cropRect);
+            LogUtils.d(TAG, "saveCroppedCover: crop=(" + bmpX + "," + bmpY + "," + bmpW + "," + bmpH + ")");
+            LogUtils.d(TAG, "saveCroppedCover: canvas size=" + canvasBitmap.getWidth() + "x" + canvasBitmap.getHeight());
+            
+            Bitmap cropped = Bitmap.createBitmap(canvasBitmap, bmpX, bmpY, bmpW, bmpH);
+            canvasBitmap.recycle();
+            
+            LogUtils.d(TAG, "saveCroppedCover: cropped size=" + cropped.getWidth() + "x" + cropped.getHeight());
+            
+            File coverDir = new File(getFilesDir(), "covers");
+            if (!coverDir.exists()) {
+                coverDir.mkdirs();
+            }
+            File coverFile = new File(coverDir, "cover_" + System.currentTimeMillis() + ".png");
+            LogUtils.d(TAG, "saveCroppedCover: cover file=" + coverFile.getAbsolutePath());
+            
+            FileOutputStream fos = new FileOutputStream(coverFile);
+            cropped.compress(Bitmap.CompressFormat.PNG, 100, fos);
+            fos.close();
+            
+            LogUtils.d(TAG, "saveCroppedCover: file exists=" + coverFile.exists() + ", length=" + coverFile.length());
+            
+            cropped.recycle();
+            
+            AlbumCoverDbHelper coverDbHelper = AlbumCoverDbHelper.getInstance(this);
+            coverDbHelper.setCoverWithCrop(albumPath, imagePath, coverFile.getAbsolutePath());
+            LogUtils.d(TAG, "saveCroppedCover: cover saved to db, albumPath=" + albumPath);
+            
+            Intent broadcastIntent = new Intent(Preferences.ACTION_COVER_UPDATED);
+            sendBroadcast(broadcastIntent);
+            
+            Toast.makeText(this, "封面已保存", Toast.LENGTH_SHORT).show();
+            setResult(RESULT_OK);
+            finish();
+        } catch (Exception e) {
+            LogUtils.e(TAG, "saveCroppedCover error: " + e.getMessage());
+            Toast.makeText(this, "Failed to save cover", Toast.LENGTH_SHORT).show();
+        }
+    }
+    
+    private void showCropInfoDialog() {
+        StringBuilder info = new StringBuilder();
+        info.append("=== 画布信息 ===\n");
+        info.append("画布宽度: ").append(cropCanvasView.getCanvasWidth()).append("px\n");
+        info.append("画布高度: ").append(cropCanvasView.getCanvasHeight()).append("px\n");
+        
+        info.append("\n=== 拾取颜色 ===\n");
+        int bgColor = cropCanvasView.getBackgroundColor();
+        info.append("背景颜色: #").append(String.format("%06X", bgColor & 0xFFFFFF)).append("\n");
+        info.append("拾取坐标: ").append(cropCanvasView.getLastPickImageX()).append(",")
+            .append(cropCanvasView.getLastPickImageY()).append("\n");
+        
+        info.append("\n=== 裁剪结果 ===\n");
+        RectF cropRect = cropCanvasView.getCropRect();
+        if (cropRect != null) {
+            info.append("裁剪区域: ").append((int)cropRect.left).append(",")
+                .append((int)cropRect.top).append(",")
+                .append((int)cropRect.right).append(",")
+                .append((int)cropRect.bottom).append("\n");
+            info.append("裁剪宽度: ").append((int)cropRect.width()).append("px\n");
+            info.append("裁剪高度: ").append((int)cropRect.height()).append("px\n");
+        }
+        
+        Bitmap canvasBitmap = cropCanvasView.getCanvasBitmap();
+        final Bitmap[] previewHolder = new Bitmap[1];
+        if (canvasBitmap != null && !canvasBitmap.isRecycled() && cropRect != null) {
+            int bmpX = Math.max(0, (int) cropRect.left);
+            int bmpY = Math.max(0, (int) cropRect.top);
+            int bmpW = Math.min((int) cropRect.width(), canvasBitmap.getWidth() - bmpX);
+            int bmpH = Math.min((int) cropRect.height(), canvasBitmap.getHeight() - bmpY);
+            if (bmpW > 0 && bmpH > 0) {
+                previewHolder[0] = Bitmap.createBitmap(canvasBitmap, bmpX, bmpY, bmpW, bmpH);
+            }
+        }
+        
+        final Bitmap previewBitmap = previewHolder[0];
+        
+        View dialogView = getLayoutInflater().inflate(R.layout.dialog_crop_info, null);
+        TextView infoText = dialogView.findViewById(R.id.info_text);
+        ImageView previewImage = dialogView.findViewById(R.id.preview_image);
+        infoText.setText(info.toString());
+        if (previewBitmap != null) {
+            previewImage.setImageBitmap(previewBitmap);
+        }
+        
+        AlertDialog dialog = new AlertDialog.Builder(this)
+            .setTitle("裁剪信息")
+            .setView(dialogView)
+            .setPositiveButton("确定", null)
+            .create();
+        dialog.setOnDismissListener(new DialogInterface.OnDismissListener() {
+            @Override
+            public void onDismiss(DialogInterface dialog) {
+                if (previewBitmap != null && !previewBitmap.isRecycled()) {
+                    previewBitmap.recycle();
+                }
+            }
+        });
+        dialog.show();
+    }
+    
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+        if (originalBitmap != null) {
+            originalBitmap.recycle();
+            originalBitmap = null;
+        }
+    }
+}

gallery/src/main/java/cc/winboll/studio/gallery/CropCanvasView.java

@@ -0,0 +1,689 @@
+package cc.winboll.studio.gallery;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Matrix;
+import android.graphics.Paint;
+import android.graphics.RectF;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+import android.view.View;
+
+public class CropCanvasView extends View {
+    public interface OnBackgroundColorChangedListener {
+        void onBackgroundColorChanged(int color);
+    }
+    
+    public interface OnColorPickedListener {
+        void onColorPicked(int color);
+    }
+    
+    public interface OnColorPickEndListener {
+        void onColorPickEnd();
+    }
+    
+    private OnBackgroundColorChangedListener backgroundColorChangedListener;
+    private OnColorPickedListener colorPickedListener;
+    private OnColorPickEndListener colorPickEndListener;
+    
+    public void setOnBackgroundColorChangedListener(OnBackgroundColorChangedListener listener) {
+        this.backgroundColorChangedListener = listener;
+    }
+    
+    public void setOnColorPickedListener(OnColorPickedListener listener) {
+        this.colorPickedListener = listener;
+    }
+    
+    public void setOnColorPickEndListener(OnColorPickEndListener listener) {
+        this.colorPickEndListener = listener;
+    }
+    private Paint imagePaint;
+    private Paint borderPaint;
+    private Paint cornerPaint;
+    private RectF cropRect;
+    private int touchArea = 50;
+    
+    private float lastX, lastY;
+    private int activeCorner = -1;
+    private static final int CORNER_TOP_LEFT = 0;
+    private static final int CORNER_TOP_RIGHT = 1;
+    private static final int CORNER_BOTTOM_LEFT = 2;
+    private static final int CORNER_BOTTOM_RIGHT = 3;
+    private static final int CORNER_CENTER = 4;
+    
+    private int imageWidth;
+    private int imageHeight;
+    private float coverRatio = 2.0f;
+    
+    private int extendHeight;
+    private int extendWidth;
+    private int canvasWidth;
+    private int canvasHeight;
+    private float minSize = 50;
+    
+    private RectF imageBounds = new RectF();
+    private RectF canvasBounds = new RectF();
+    private Bitmap originalBitmap;
+    private Bitmap canvasBitmap;
+    private float bitmapScale = 1.0f;
+    private Bitmap displayBitmap;
+    private RectF initialSpanRect;
+    private float initialSpan;
+    private int backgroundColor = Color.BLUE;
+    private boolean colorPickMode = false;
+    private int previewColor = 0;
+    private float lastPickX = 0;
+    private float lastPickY = 0;
+    private float pickX, pickY;
+    
+    private float displayScale = 1.0f;
+    private float displayOffsetX = 0f;
+    private float displayOffsetY = 0f;
+    private static final int MAX_DISPLAY_SIZE = 2048;
+    private float containerScale = 1.0f;
+    
+    public CropCanvasView(Context context) {
+        super(context);
+        init();
+    }
+    
+    public CropCanvasView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init();
+    }
+    
+    public CropCanvasView(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        init();
+    }
+    
+    private void init() {
+        imagePaint = new Paint();
+        imagePaint.setFilterBitmap(true);
+        
+        borderPaint = new Paint();
+        borderPaint.setColor(Color.parseColor("#CCAA00"));
+        borderPaint.setStyle(Paint.Style.STROKE);
+        borderPaint.setStrokeWidth(3);
+        
+        cornerPaint = new Paint();
+        cornerPaint.setColor(Color.WHITE);
+        cornerPaint.setStyle(Paint.Style.FILL);
+    }
+    
+    public void setImageBitmap(Bitmap bitmap) {
+        if (displayBitmap != null && displayBitmap != originalBitmap) {
+            displayBitmap.recycle();
+        }
+        this.originalBitmap = bitmap;
+        createDisplayBitmap();
+    }
+    
+    private void createDisplayBitmap() {
+        if (displayBitmap != null && displayBitmap != originalBitmap) {
+            displayBitmap.recycle();
+            displayBitmap = null;
+        }
+        if (originalBitmap == null || originalBitmap.isRecycled()) {
+            return;
+        }
+        int w = originalBitmap.getWidth();
+        int h = originalBitmap.getHeight();
+        float scale = 1.0f;
+        if (w > MAX_DISPLAY_SIZE || h > MAX_DISPLAY_SIZE) {
+            scale = Math.min((float) MAX_DISPLAY_SIZE / w, (float) MAX_DISPLAY_SIZE / h);
+            int newW = (int) (w * scale);
+            int newH = (int) (h * scale);
+            displayBitmap = Bitmap.createScaledBitmap(originalBitmap, newW, newH, true);
+        } else {
+            displayBitmap = originalBitmap;
+        }
+        displayBitmapScale = scale;
+    }
+    
+    private float displayBitmapScale = 1.0f;
+    
+    public Bitmap getOriginalBitmap() {
+        return originalBitmap;
+    }
+    
+    public float getDisplayBitmapScale() {
+        return displayBitmapScale;
+    }
+    
+    public void onContainerScaled() {
+        containerScale = 1.0f;
+        invalidate();
+    }
+    
+    public void setContainerScale(float scale) {
+        if (scale > 0 && scale != containerScale) {
+            containerScale = scale;
+            invalidate();
+        }
+    }
+    
+    public float getContainerScale() {
+        return containerScale;
+    }
+    
+    public Bitmap getCanvasBitmap() {
+        if (canvasWidth <= 0 || canvasHeight <= 0) {
+            return null;
+        }
+        Bitmap canvasBmp = Bitmap.createBitmap(canvasWidth, canvasHeight, Bitmap.Config.ARGB_8888);
+        Canvas canvas = new Canvas(canvasBmp);
+        canvas.drawColor(backgroundColor);
+        if (displayBitmap != null && !displayBitmap.isRecycled()) {
+            if (displayBitmap == originalBitmap) {
+                canvas.drawBitmap(displayBitmap, imageBounds.left, imageBounds.top, imagePaint);
+            } else {
+                float invScale = 1f / displayBitmapScale;
+                canvas.save();
+                canvas.scale(invScale, invScale);
+                canvas.drawBitmap(displayBitmap, imageBounds.left * displayBitmapScale, 
+                                  imageBounds.top * displayBitmapScale, imagePaint);
+                canvas.restore();
+            }
+        }
+        return canvasBmp;
+    }
+    
+    public void initCanvas(int imgWidth, int imgHeight, float ratio) {
+        this.imageWidth = imgWidth;
+        this.imageHeight = imgHeight;
+        this.coverRatio = ratio;
+        
+        float imgRatio = (float) imgWidth / imgHeight;
+        
+        if (coverRatio >= imgRatio) {
+            extendHeight = imgHeight;
+            extendWidth = (int) (imgHeight * coverRatio);
+        } else {
+            extendWidth = imgWidth;
+            extendHeight = (int) (imgWidth / coverRatio);
+        }
+        
+        canvasHeight = Math.max(imageHeight, extendHeight);
+        canvasWidth = Math.max(imageWidth, extendWidth);
+        
+        float left = (canvasWidth - imageWidth) / 2f;
+        float top = (canvasHeight - imageHeight) / 2f;
+        imageBounds.set(left, top, left + imageWidth, top + imageHeight);
+        canvasBounds.set(0, 0, canvasWidth, canvasHeight);
+        
+        cropRect = new RectF(canvasBounds);
+        
+        requestLayout();
+        invalidate();
+    }
+    
+    public void getDisplayMatrix(Matrix matrix) {
+        if (canvasWidth <= 0 || canvasHeight <= 0 || getWidth() <= 0 || getHeight() <= 0) {
+            return;
+        }
+        matrix.reset();
+        
+        float displayScaleX = (float) getWidth() / canvasWidth;
+        float displayScaleY = (float) getHeight() / canvasHeight;
+        displayScale = Math.min(displayScaleX, displayScaleY);
+        
+        displayOffsetX = (getWidth() - canvasWidth * displayScale) / 2f;
+        displayOffsetY = (getHeight() - canvasHeight * displayScale) / 2f;
+        
+        matrix.postTranslate(displayOffsetX, displayOffsetY);
+        matrix.postScale(displayScale, displayScale);
+    }
+    
+    public float screenToImageX(float screenX) {
+        return (screenX - displayOffsetX) / displayScale;
+    }
+    
+    public float screenToImageY(float screenY) {
+        return (screenY - displayOffsetY) / displayScale;
+    }
+    
+    public float imageToScreenX(float imageX) {
+        return imageX * displayScale + displayOffsetX;
+    }
+    
+    public float imageToScreenY(float imageY) {
+        return imageY * displayScale + displayOffsetY;
+    }
+    
+    public int getImageColorAt(float screenX, float screenY) {
+        Bitmap bmp = (displayBitmap != null) ? displayBitmap : originalBitmap;
+        if (bmp == null || bmp.isRecycled()) {
+            return Color.TRANSPARENT;
+        }
+        float imgX = screenToImageX(screenX);
+        float imgY = screenToImageY(screenY);
+        int bmpX = (int) ((imgX - imageBounds.left) * displayBitmapScale);
+        int bmpY = (int) ((imgY - imageBounds.top) * displayBitmapScale);
+        if (bmpX >= 0 && bmpX < bmp.getWidth() && 
+            bmpY >= 0 && bmpY < bmp.getHeight()) {
+            return bmp.getPixel(bmpX, bmpY);
+        }
+        return Color.TRANSPARENT;
+    }
+    
+    public void setBackgroundColor(int color) {
+        this.backgroundColor = color;
+        if (backgroundColorChangedListener != null) {
+            backgroundColorChangedListener.onBackgroundColorChanged(color);
+        }
+        invalidate();
+    }
+    
+    public int getBackgroundColor() {
+        return backgroundColor;
+    }
+    
+    public int getPreviewColor() {
+        return previewColor;
+    }
+    
+    public float getLastPickX() {
+        return lastPickX;
+    }
+    
+    public float getLastPickY() {
+        return lastPickY;
+    }
+    
+    public int getLastPickImageX() {
+        if (originalBitmap == null || originalBitmap.isRecycled()) {
+            return 0;
+        }
+        float imgX = screenToImageX(lastPickX);
+        float imgY = screenToImageY(lastPickY);
+        int bmpX = (int) ((imgX - imageBounds.left) * displayBitmapScale);
+        int bmpY = (int) ((imgY - imageBounds.top) * displayBitmapScale);
+        return Math.max(0, Math.min(bmpX, originalBitmap.getWidth() - 1));
+    }
+    
+    public int getLastPickImageY() {
+        if (originalBitmap == null || originalBitmap.isRecycled()) {
+            return 0;
+        }
+        float imgX = screenToImageX(lastPickX);
+        float imgY = screenToImageY(lastPickY);
+        int bmpX = (int) ((imgX - imageBounds.left) * displayBitmapScale);
+        int bmpY = (int) ((imgY - imageBounds.top) * displayBitmapScale);
+        return Math.max(0, Math.min(bmpY, originalBitmap.getHeight() - 1));
+    }
+    
+    public void setColorPickMode(boolean enable) {
+        this.colorPickMode = enable;
+        if (enable) {
+            pickX = -1;
+            pickY = -1;
+        }
+        invalidate();
+    }
+    
+    public boolean isColorPickMode() {
+        return colorPickMode;
+    }
+    
+    public void scaleToView(int viewWidth, int viewHeight) {
+        if (viewWidth > 0 && viewHeight > 0 && canvasWidth > 0 && canvasHeight > 0) {
+            float scale = Math.max((float) viewWidth / canvasWidth, (float) viewHeight / canvasHeight);
+            int oldCanvasW = canvasWidth;
+            int oldCanvasH = canvasHeight;
+            canvasWidth = (int) (canvasWidth * scale);
+            canvasHeight = (int) (canvasHeight * scale);
+            
+            float left = (canvasWidth - imageWidth) / 2f;
+            float top = (canvasHeight - imageHeight) / 2f;
+            imageBounds.set(left, top, left + imageWidth, top + imageHeight);
+            canvasBounds.set(0, 0, canvasWidth, canvasHeight);
+            
+            if (cropRect != null) {
+                float scaleX = (float) canvasWidth / oldCanvasW;
+                float scaleY = (float) canvasHeight / oldCanvasH;
+                cropRect.left *= scaleX;
+                cropRect.top *= scaleY;
+                cropRect.right *= scaleX;
+                cropRect.bottom *= scaleY;
+            }
+            
+            requestLayout();
+            invalidate();
+        }
+    }
+    
+    public RectF getCropRect() {
+        return new RectF(cropRect);
+    }
+    
+    public int getCanvasWidth() {
+        return canvasWidth;
+    }
+    
+    public int getCanvasHeight() {
+        return canvasHeight;
+    }
+    
+    public RectF getCanvasBounds() {
+        return new RectF(canvasBounds);
+    }
+    
+    public RectF getImageBounds() {
+        return new RectF(imageBounds);
+    }
+    
+    public float getBitmapScale() {
+        return displayScale;
+    }
+    
+    public float getDisplayScale() {
+        return displayScale;
+    }
+    
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        int w = canvasWidth > 0 ? canvasWidth : 0;
+        int h = canvasHeight > 0 ? canvasHeight : 0;
+        setMeasuredDimension(w, h);
+    }
+    
+    @Override
+    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
+        super.onSizeChanged(w, h, oldw, oldh);
+        getDisplayMatrix(new Matrix());
+    }
+    
+    @Override
+    protected void onDraw(Canvas canvas) {
+        super.onDraw(canvas);
+        
+        if (cropRect == null) return;
+        
+        if (displayBitmap != null && !displayBitmap.isRecycled()) {
+            canvas.save();
+            
+            Matrix matrix = new Matrix();
+            getDisplayMatrix(matrix);
+            canvas.concat(matrix);
+            
+            canvas.drawColor(backgroundColor);
+            
+            if (displayBitmap == originalBitmap) {
+                canvas.drawBitmap(displayBitmap, imageBounds.left, imageBounds.top, imagePaint);
+            } else {
+                float invScale = 1f / displayBitmapScale;
+                canvas.save();
+                canvas.scale(invScale, invScale);
+                canvas.drawBitmap(displayBitmap, imageBounds.left * displayBitmapScale, 
+                                  imageBounds.top * displayBitmapScale, imagePaint);
+                canvas.restore();
+            }
+            
+            canvas.restore();
+            
+            if (containerScale != 1.0f) {
+                canvas.save();
+                canvas.scale(containerScale, containerScale);
+                canvas.drawRect(cropRect, borderPaint);
+                float cornerRadius = 12f / containerScale;
+                canvas.drawCircle(cropRect.left, cropRect.top, cornerRadius, cornerPaint);
+                canvas.drawCircle(cropRect.right, cropRect.top, cornerRadius, cornerPaint);
+                canvas.drawCircle(cropRect.left, cropRect.bottom, cornerRadius, cornerPaint);
+                canvas.drawCircle(cropRect.right, cropRect.bottom, cornerRadius, cornerPaint);
+                canvas.restore();
+            } else {
+                canvas.drawRect(cropRect, borderPaint);
+                canvas.drawCircle(cropRect.left, cropRect.top, 12, cornerPaint);
+                canvas.drawCircle(cropRect.right, cropRect.top, 12, cornerPaint);
+                canvas.drawCircle(cropRect.left, cropRect.bottom, 12, cornerPaint);
+                canvas.drawCircle(cropRect.right, cropRect.bottom, 12, cornerPaint);
+            }
+        } else {
+            if (containerScale != 1.0f) {
+                canvas.save();
+                canvas.scale(containerScale, containerScale);
+                canvas.drawRect(cropRect, borderPaint);
+                float cornerRadius = 12f / containerScale;
+                canvas.drawCircle(cropRect.left, cropRect.top, cornerRadius, cornerPaint);
+                canvas.drawCircle(cropRect.right, cropRect.top, cornerRadius, cornerPaint);
+                canvas.drawCircle(cropRect.left, cropRect.bottom, cornerRadius, cornerPaint);
+                canvas.drawCircle(cropRect.right, cropRect.bottom, cornerRadius, cornerPaint);
+                canvas.restore();
+            } else {
+                canvas.drawRect(cropRect, borderPaint);
+                canvas.drawCircle(cropRect.left, cropRect.top, 12, cornerPaint);
+                canvas.drawCircle(cropRect.right, cropRect.top, 12, cornerPaint);
+                canvas.drawCircle(cropRect.left, cropRect.bottom, 12, cornerPaint);
+                canvas.drawCircle(cropRect.right, cropRect.bottom, 12, cornerPaint);
+            }
+        }
+    }
+    
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+        if (cropRect == null || canvasBounds.isEmpty()) return super.onTouchEvent(event);
+        
+        if (event.getPointerCount() == 2) {
+            int action = event.getActionMasked();
+            if (action == MotionEvent.ACTION_POINTER_DOWN) {
+                initialSpan = getSpan(event);
+                return true;
+            } else if (action == MotionEvent.ACTION_MOVE) {
+                float span = getSpan(event);
+                if (initialSpan > 0) {
+                    float scale = span / initialSpan;
+                    float centerX = cropRect.centerX();
+                    float centerY = cropRect.centerY();
+                    float newWidth = cropRect.width() * scale;
+                    float newHeight = newWidth / coverRatio;
+                    
+                    newWidth = Math.max(minSize, Math.min(newWidth, canvasBounds.width()));
+                    newHeight = newWidth / coverRatio;
+                    
+                    float newLeft = centerX - newWidth / 2;
+                    float newTop = centerY - newHeight / 2;
+                    float newRight = centerX + newWidth / 2;
+                    float newBottom = centerY + newHeight / 2;
+                    
+                    if (newLeft >= canvasBounds.left && newRight <= canvasBounds.right &&
+                        newTop >= canvasBounds.top && newBottom <= canvasBounds.bottom) {
+                        cropRect.set(newLeft, newTop, newRight, newBottom);
+                    }
+                    
+                    initialSpan = span;
+                    invalidate();
+                }
+                return true;
+            }
+        }
+        
+        float x = event.getX();
+        float y = event.getY();
+        
+        RectF bounds = canvasBounds;
+        if (containerScale != 1.0f) {
+            x = x / containerScale;
+            y = y / containerScale;
+            bounds = new RectF(
+                canvasBounds.left,
+                canvasBounds.top,
+                canvasBounds.right,
+                canvasBounds.bottom
+            );
+        }
+        
+        if (colorPickMode) {
+            if (event.getAction() == MotionEvent.ACTION_DOWN || event.getAction() == MotionEvent.ACTION_MOVE) {
+                if (originalBitmap != null && !originalBitmap.isRecycled()) {
+                    float imgX = screenToImageX(x);
+                    float imgY = screenToImageY(y);
+                    if (imageBounds.contains(imgX, imgY)) {
+                        previewColor = getImageColorAt(x, y);
+                    } else if (canvasBounds.contains(x, y)) {
+                        previewColor = backgroundColor;
+                    } else {
+                        previewColor = Color.TRANSPARENT;
+                    }
+                    lastPickX = x;
+                    lastPickY = y;
+                    if (backgroundColorChangedListener != null) {
+                        backgroundColorChangedListener.onBackgroundColorChanged(previewColor);
+                    }
+                }
+                return true;
+            }
+            if (event.getAction() == MotionEvent.ACTION_UP) {
+                if (canvasBounds.contains(x, y)) {
+                    int pickedColor;
+                    float imgX = screenToImageX(x);
+                    float imgY = screenToImageY(y);
+                    if (imageBounds.contains(imgX, imgY)) {
+                        int colorAtPoint = getImageColorAt(x, y);
+                        pickedColor = colorAtPoint;
+                        backgroundColor = colorAtPoint;
+                    } else {
+                        pickedColor = backgroundColor;
+                    }
+                    if (colorPickedListener != null) {
+                        colorPickedListener.onColorPicked(pickedColor);
+                    }
+                }
+                if (colorPickEndListener != null) {
+                    colorPickEndListener.onColorPickEnd();
+                }
+                previewColor = 0;
+                invalidate();
+                return true;
+            }
+            return true;
+        }
+        
+        switch (event.getAction()) {
+            case MotionEvent.ACTION_DOWN:
+                lastX = x;
+                lastY = y;
+                activeCorner = getActiveCorner(x, y);
+                return true;
+                
+            case MotionEvent.ACTION_MOVE:
+                float dx = x - lastX;
+                float dy = y - lastY;
+                
+                if (activeCorner == CORNER_CENTER) {
+                    float newLeft = cropRect.left + dx;
+                    float newTop = cropRect.top + dy;
+                    float newRight = cropRect.right + dx;
+                    float newBottom = cropRect.bottom + dy;
+                    
+                    if (newLeft >= bounds.left && newRight <= bounds.right) {
+                        cropRect.left = newLeft;
+                        cropRect.right = newRight;
+                    }
+                    if (newTop >= bounds.top && newBottom <= bounds.bottom) {
+                        cropRect.top = newTop;
+                        cropRect.bottom = newBottom;
+                    }
+                } else if (activeCorner == CORNER_TOP_LEFT) {
+                    adjustCorner(cropRect.left + dx, cropRect.top + dy, true, true);
+                } else if (activeCorner == CORNER_TOP_RIGHT) {
+                    adjustCorner(cropRect.right + dx, cropRect.top + dy, false, true);
+                } else if (activeCorner == CORNER_BOTTOM_LEFT) {
+                    adjustCorner(cropRect.left + dx, cropRect.bottom + dy, true, false);
+                } else if (activeCorner == CORNER_BOTTOM_RIGHT) {
+                    adjustCorner(cropRect.right + dx, cropRect.bottom + dy, false, false);
+                }
+                
+                lastX = x;
+                lastY = y;
+                invalidate();
+                return true;
+                
+            case MotionEvent.ACTION_UP:
+                activeCorner = -1;
+                return true;
+        }
+        return super.onTouchEvent(event);
+    }
+    
+    private void adjustCorner(float nx, float ny, boolean left, boolean top) {
+        float newWidth;
+        float newLeft = cropRect.left;
+        float newTop = cropRect.top;
+        float newRight = cropRect.right;
+        float newBottom = cropRect.bottom;
+        
+        if (left) {
+            newWidth = cropRect.width() - (nx - cropRect.left);
+            newLeft = Math.max(canvasBounds.left, Math.min(nx, cropRect.right - minSize));
+        } else {
+            newWidth = nx - cropRect.left;
+            newRight = Math.min(canvasBounds.right, Math.max(nx, cropRect.left + minSize));
+            newLeft = cropRect.left;
+        }
+        
+        float newHeight = newWidth / coverRatio;
+        
+        if (top) {
+            newTop = Math.max(canvasBounds.top, Math.min(cropRect.bottom - minSize, cropRect.bottom - newHeight));
+            newBottom = newTop + newHeight;
+        } else {
+            newBottom = Math.min(canvasBounds.bottom, Math.max(cropRect.top + minSize, cropRect.top + newHeight));
+            newTop = newBottom - newHeight;
+        }
+        
+        if (left) {
+            cropRect.left = newLeft;
+            cropRect.right = newLeft + newWidth;
+        } else {
+            cropRect.right = newRight;
+            cropRect.left = newRight - newWidth;
+        }
+        
+        if (top) {
+            cropRect.top = newTop;
+            cropRect.bottom = newTop + newHeight;
+        } else {
+            cropRect.bottom = newBottom;
+            cropRect.top = newBottom - newHeight;
+        }
+    }
+    
+    private int getActiveCorner(float x, float y) {
+        float dx = Math.abs(x - cropRect.left);
+        float dy = Math.abs(y - cropRect.top);
+        float dx2 = Math.abs(x - cropRect.right);
+        float dy2 = Math.abs(y - cropRect.bottom);
+        
+        if (dx <= touchArea && dy <= touchArea) {
+            return CORNER_TOP_LEFT;
+        }
+        if (dx2 <= touchArea && dy <= touchArea) {
+            return CORNER_TOP_RIGHT;
+        }
+        if (dx <= touchArea && dy2 <= touchArea) {
+            return CORNER_BOTTOM_LEFT;
+        }
+        if (dx2 <= touchArea && dy2 <= touchArea) {
+            return CORNER_BOTTOM_RIGHT;
+        }
+        if (x > cropRect.left && x < cropRect.right && y > cropRect.top && y < cropRect.bottom) {
+            return CORNER_CENTER;
+        }
+        return -1;
+    }
+    
+    private float getSpan(MotionEvent event) {
+        float x0 = event.getX(0);
+        float y0 = event.getY(0);
+        float x1 = event.getX(1);
+        float y1 = event.getY(1);
+        return (float) Math.sqrt((x1 - x0) * (x1 - x0) + (y1 - y0) * (y1 - y0));
+    }
+    
+    public int getColorAt(float x, float y) {
+        return getImageColorAt(x, y);
+    }
+}

gallery/src/main/java/cc/winboll/studio/gallery/CropOverlayView.java

@@ -0,0 +1,224 @@
+package cc.winboll.studio.gallery;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.RectF;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+import android.view.View;
+
+public class CropOverlayView extends View {
+    public interface OnCanvasSizeChangedListener {
+        void onCanvasSizeChanged(RectF canvasBounds);
+    }
+    
+    private OnCanvasSizeChangedListener canvasSizeChangedListener;
+    
+    private Paint borderPaint;
+    private Paint cornerPaint;
+    private RectF cropRect;
+    private int touchArea = 50;
+    
+    private float lastX, lastY;
+    private int activeCorner = -1;
+    private static final int CORNER_TOP_LEFT = 0;
+    private static final int CORNER_TOP_RIGHT = 1;
+    private static final int CORNER_BOTTOM_LEFT = 2;
+    private static final int CORNER_BOTTOM_RIGHT = 3;
+    private static final int CORNER_CENTER = 4;
+    
+    private float targetRatio = 2.0f;
+    private RectF canvasBounds = new RectF();
+    private float minSize = 50;
+    
+    public CropOverlayView(Context context) {
+        super(context);
+        initPaints();
+    }
+    
+    public CropOverlayView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        initPaints();
+    }
+    
+    public CropOverlayView(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        initPaints();
+    }
+    
+    private void initPaints() {
+        borderPaint = new Paint();
+        borderPaint.setColor(Color.parseColor("#CCAA00"));
+        borderPaint.setStyle(Paint.Style.STROKE);
+        borderPaint.setStrokeWidth(3);
+        
+        cornerPaint = new Paint();
+        cornerPaint.setColor(Color.WHITE);
+        cornerPaint.setStyle(Paint.Style.FILL);
+    }
+    
+    public void setTargetRatio(float ratio) {
+        this.targetRatio = ratio;
+    }
+    
+    public float getTargetRatio() {
+        return targetRatio;
+    }
+    
+    public void setOnCanvasSizeChangedListener(OnCanvasSizeChangedListener listener) {
+        this.canvasSizeChangedListener = listener;
+    }
+    
+    public void initCanvas(int canvasW, int canvasH) {
+        canvasBounds.set(0, 0, canvasW, canvasH);
+        
+        cropRect = new RectF(0, 0, canvasW, canvasH);
+        
+        if (canvasSizeChangedListener != null) {
+            canvasSizeChangedListener.onCanvasSizeChanged(new RectF(canvasBounds));
+        }
+        invalidate();
+    }
+    
+    public RectF getCropRect() {
+        return new RectF(cropRect);
+    }
+    
+    public RectF getCanvasBounds() {
+        return new RectF(canvasBounds);
+    }
+    
+    @Override
+    protected void onDraw(Canvas canvas) {
+        super.onDraw(canvas);
+        
+        canvas.drawColor(Color.TRANSPARENT);
+        
+        if (cropRect != null) {
+            canvas.drawRect(cropRect, borderPaint);
+            
+            canvas.drawCircle(cropRect.left, cropRect.top, 12, cornerPaint);
+            canvas.drawCircle(cropRect.right, cropRect.top, 12, cornerPaint);
+            canvas.drawCircle(cropRect.left, cropRect.bottom, 12, cornerPaint);
+            canvas.drawCircle(cropRect.right, cropRect.bottom, 12, cornerPaint);
+        }
+    }
+    
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+        if (cropRect == null || canvasBounds.isEmpty()) return false;
+        
+        float x = event.getX();
+        float y = event.getY();
+        
+        switch (event.getAction()) {
+            case MotionEvent.ACTION_DOWN:
+                lastX = x;
+                lastY = y;
+                activeCorner = getActiveCorner(x, y);
+                return true;
+                
+            case MotionEvent.ACTION_MOVE:
+                float dx = x - lastX;
+                float dy = y - lastY;
+                
+                if (activeCorner == CORNER_CENTER) {
+                    float newLeft = cropRect.left + dx;
+                    float newTop = cropRect.top + dy;
+                    float newRight = cropRect.right + dx;
+                    float newBottom = cropRect.bottom + dy;
+                    
+                    if (newLeft >= canvasBounds.left && newRight <= canvasBounds.right) {
+                        cropRect.left = newLeft;
+                        cropRect.right = newRight;
+                    }
+                    if (newTop >= canvasBounds.top && newBottom <= canvasBounds.bottom) {
+                        cropRect.top = newTop;
+                        cropRect.bottom = newBottom;
+                    }
+                } else if (activeCorner == CORNER_TOP_LEFT) {
+                    adjustCorner(cropRect.left + dx, cropRect.top + dy, true, true);
+                } else if (activeCorner == CORNER_TOP_RIGHT) {
+                    adjustCorner(cropRect.right + dx, cropRect.top + dy, false, true);
+                } else if (activeCorner == CORNER_BOTTOM_LEFT) {
+                    adjustCorner(cropRect.left + dx, cropRect.bottom + dy, true, false);
+                } else if (activeCorner == CORNER_BOTTOM_RIGHT) {
+                    adjustCorner(cropRect.right + dx, cropRect.bottom + dy, false, false);
+                }
+                
+                lastX = x;
+                lastY = y;
+                invalidate();
+                return true;
+                
+            case MotionEvent.ACTION_UP:
+                activeCorner = -1;
+                return true;
+        }
+        return super.onTouchEvent(event);
+    }
+    
+    private void adjustCorner(float nx, float ny, boolean left, boolean top) {
+        float newWidth;
+        float newLeft = cropRect.left;
+        float newTop = cropRect.top;
+        float newRight = cropRect.right;
+        float newBottom = cropRect.bottom;
+        
+        if (left) {
+            newWidth = cropRect.width() - (nx - cropRect.left);
+            newLeft = Math.max(canvasBounds.left, Math.min(nx, cropRect.right - minSize));
+        } else {
+            newWidth = nx - cropRect.left;
+            newRight = Math.min(canvasBounds.right, Math.max(nx, cropRect.left + minSize));
+            newLeft = cropRect.left;
+        }
+        
+        float newHeight = newWidth / targetRatio;
+        
+        if (top) {
+            newTop = Math.max(canvasBounds.top, Math.min(cropRect.bottom - minSize, cropRect.bottom - newHeight));
+            newBottom = newTop + newHeight;
+        } else {
+            newBottom = Math.min(canvasBounds.bottom, Math.max(cropRect.top + minSize, cropRect.top + newHeight));
+            newTop = newBottom - newHeight;
+        }
+        
+        if (left) {
+            cropRect.left = newLeft;
+            cropRect.right = newLeft + newWidth;
+        } else {
+            cropRect.right = newRight;
+            cropRect.left = newRight - newWidth;
+        }
+        
+        if (top) {
+            cropRect.top = newTop;
+            cropRect.bottom = newTop + newHeight;
+        } else {
+            cropRect.bottom = newBottom;
+            cropRect.top = newBottom - newHeight;
+        }
+    }
+    
+    private int getActiveCorner(float x, float y) {
+        if (Math.abs(x - cropRect.left) <= touchArea && Math.abs(y - cropRect.top) <= touchArea) {
+            return CORNER_TOP_LEFT;
+        }
+        if (Math.abs(x - cropRect.right) <= touchArea && Math.abs(y - cropRect.top) <= touchArea) {
+            return CORNER_TOP_RIGHT;
+        }
+        if (Math.abs(x - cropRect.left) <= touchArea && Math.abs(y - cropRect.bottom) <= touchArea) {
+            return CORNER_BOTTOM_LEFT;
+        }
+        if (Math.abs(x - cropRect.right) <= touchArea && Math.abs(y - cropRect.bottom) <= touchArea) {
+            return CORNER_BOTTOM_RIGHT;
+        }
+        if (cropRect.contains(x, y)) {
+            return CORNER_CENTER;
+        }
+        return -1;
+    }
+}

gallery/src/main/java/cc/winboll/studio/gallery/ImageAdapter.java

@@ -1,6 +1,7 @@
 package cc.winboll.studio.gallery;
 
 import android.content.DialogInterface;
+import android.content.Intent;
 import android.net.Uri;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -94,6 +95,14 @@ public class ImageAdapter extends RecyclerView.Adapter<ImageAdapter.ViewHolder>
         this.albumPath = albumPath;
     }
     
+    public int getCropWidth() {
+        return prefs != null ? prefs.getCoverWidth() : 240;
+    }
+    
+    public int getCropHeight() {
+        return prefs != null ? prefs.getCoverHeight() : 120;
+    }
+    
     public void refreshBg() {
         if (prefs != null) {
             bgType = prefs.getBgType();
@@ -111,16 +120,38 @@ public class ImageAdapter extends RecyclerView.Adapter<ImageAdapter.ViewHolder>
     
     private void showContextMenu(View view, final int position) {
         final String imagePath = imagePaths.get(position);
+        final Uri imageUri = imageUrls.get(position);
+        final boolean[] isPinned = {pinnedDbHelper != null && pinnedDbHelper.isPinned(imagePath)};
+        final boolean[] isCover = {false};
+        if (coverDbHelper != null && albumPath != null) {
+            String originalPath = coverDbHelper.getOriginalImagePath(albumPath);
+            isCover[0] = originalPath != null && originalPath.equals(imagePath);
+        }
+        
         android.app.AlertDialog.Builder builder = new android.app.AlertDialog.Builder(view.getContext());
         builder.setTitle("Image");
-        boolean isPinned = pinnedDbHelper != null && pinnedDbHelper.isPinned(imagePath);
+        
-        String[] items = isPinned ? new String[]{"取消置顶", "设置为封面"} : new String[]{"置顶", "设置为封面"};
+        String[] items;
+        if (isPinned[0]) {
+            if (isCover[0]) {
+                items = new String[]{"取消置顶", "调整封面", "取消封面"};
+            } else {
+                items = new String[]{"取消置顶", "设置为封面"};
+            }
+        } else {
+            if (isCover[0]) {
+                items = new String[]{"置顶", "调整封面", "取消封面"};
+            } else {
+                items = new String[]{"置顶", "设置为封面"};
+            }
+        }
+        
         builder.setItems(items, new android.content.DialogInterface.OnClickListener() {
             @Override
             public void onClick(android.content.DialogInterface dialog, int which) {
                 if (which == 0) {
                     if (pinnedDbHelper != null) {
-                        if (isPinned) {
+                        if (isPinned[0]) {
                             pinnedDbHelper.unpinImage(imagePath);
                         } else {
                             pinnedDbHelper.pinImage(imagePath);
@@ -129,7 +160,17 @@ public class ImageAdapter extends RecyclerView.Adapter<ImageAdapter.ViewHolder>
                     }
                 } else if (which == 1) {
                     if (coverDbHelper != null && albumPath != null) {
-                        coverDbHelper.setCover(albumPath, imagePath);
+                        Intent cropIntent = new Intent(view.getContext(), CropActivity.class);
+                        cropIntent.putExtra(CropActivity.EXTRA_IMAGE_URI, imageUri);
+                        cropIntent.putExtra(CropActivity.EXTRA_IMAGE_PATH, imagePath);
+                        cropIntent.putExtra(CropActivity.EXTRA_ALBUM_PATH, albumPath);
+                        cropIntent.putExtra(CropActivity.EXTRA_CROP_WIDTH, getCropWidth());
+                        cropIntent.putExtra(CropActivity.EXTRA_CROP_HEIGHT, getCropHeight());
+                        ((AlbumActivity) view.getContext()).startActivityForResult(cropIntent, 100);
+                    }
+                } else if (which == 2) {
+                    if (coverDbHelper != null && albumPath != null && isCover[0]) {
+                        coverDbHelper.deleteCover(albumPath);
                         notifyDataSetChanged();
                     }
                 }
@@ -162,7 +203,11 @@ public class ImageAdapter extends RecyclerView.Adapter<ImageAdapter.ViewHolder>
         boolean isPinned = pinnedDbHelper != null && pinnedDbHelper.isPinned(imagePath);
         holder.pinIcon.setVisibility(isPinned ? View.VISIBLE : View.GONE);
         
-        boolean isCover = coverDbHelper != null && albumPath != null && imagePath.equals(coverDbHelper.getCover(albumPath));
+        boolean isCover = false;
+        if (coverDbHelper != null && albumPath != null) {
+            String originalPath = coverDbHelper.getOriginalImagePath(albumPath);
+            isCover = originalPath != null && originalPath.equals(imagePath);
+        }
         holder.coverIcon.setVisibility(isCover ? View.VISIBLE : View.GONE);
         
         holder.itemView.setOnClickListener(new OnClickListener() {

gallery/src/main/java/cc/winboll/studio/gallery/MainActivity.java

@@ -1,8 +1,11 @@
 package cc.winboll.studio.gallery;
 
 import android.Manifest;
+import android.content.BroadcastReceiver;
 import android.content.ContentResolver;
+import android.content.Context;
 import android.content.Intent;
+import android.content.IntentFilter;
 import android.content.pm.PackageManager;
 import android.database.Cursor;
 import android.media.MediaScannerConnection;
@@ -192,9 +195,17 @@ private void loadAlbums() {
                 LogUtils.d(TAG, "scanning folder: " + subfolder.getName());
                 String albumPath = subfolder.getAbsolutePath();
                 String coverPath = coverDbHelper.getCover(albumPath);
+                LogUtils.d(TAG, "loadAlbums: album=" + albumPath + ", coverPath=" + coverPath);
                 Uri coverUri = null;
                 if (coverPath != null) {
-                    coverUri = getUriFromPath(coverPath);
+                    File coverFile = new File(coverPath);
+                    if (coverFile.exists()) {
+                        coverUri = Uri.fromFile(coverFile);
+                        LogUtils.d(TAG, "loadAlbums: cover from file=" + coverFile.getAbsolutePath());
+                    } else {
+                        coverUri = getUriFromPath(coverPath);
+                        LogUtils.d(TAG, "loadAlbums: cover from media store path=" + coverPath);
+                    }
                 }
                 if (coverUri == null) {
                     ArrayList<Uri> images = getImagesInFolder(albumPath);
@@ -281,26 +292,32 @@ private void loadAlbums() {
         if (id == R.id.action_settings) {
             startActivity(new Intent(this, SettingsActivity.class));
             return true;
+        } else if (id == R.id.action_about) {
+            startActivity(new Intent(this, AboutActivity.class));
+            return true;
         } else if (id == R.id.action_trash) {
             startActivity(new Intent(this, TrashActivity.class));
             return true;
-        } else if (id == R.id.action_refresh) {
-            if (checkPermission()) {
-                loadAlbums();
-            }
-            return true;
         } else if (id == R.id.action_debug) {
-			LogActivity.startLogActivity(this);
+            LogActivity.startLogActivity(this);
-//            Log.d("Gallery", "Debug log message");
-//            Toast.makeText(this, R.string.debug_message, Toast.LENGTH_SHORT).show();
             return true;
         }
         return super.onOptionsItemSelected(item);
     }
     
+    private BroadcastReceiver coverUpdatedReceiver = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            if (Preferences.ACTION_COVER_UPDATED.equals(intent.getAction())) {
+                loadAlbums();
+            }
+        }
+    };
+    
     @Override
     protected void onResume() {
         super.onResume();
+        registerReceiver(coverUpdatedReceiver, new IntentFilter(Preferences.ACTION_COVER_UPDATED));
         if (checkPermission()) {
             scanMediaStore();
             loadAlbums();
@@ -308,9 +325,16 @@ private void loadAlbums() {
         if (adapter != null) {
             adapter.refreshBg();
             adapter.refreshPinned();
+            adapter.refreshCover();
         }
     }
     
+    @Override
+    protected void onPause() {
+        super.onPause();
+        unregisterReceiver(coverUpdatedReceiver);
+    }
+    
     private void scanMediaStore() {
         String folderPath = prefs.getFolderPath();
         File baseFolder = new File(folderPath);

gallery/src/main/java/cc/winboll/studio/gallery/Preferences.java

@@ -10,8 +10,17 @@ public class Preferences {
     private static final String KEY_FOLDER_PATH = "folder_path";
     private static final String KEY_BG_TYPE = "bg_type";
     private static final String KEY_ALBUM_SORT_MODE = "album_sort_mode";
+    private static final String KEY_COVER_WIDTH = "cover_width";
+    private static final String KEY_COVER_HEIGHT = "cover_height";
+    private static final String KEY_COVER_RATIO = "cover_ratio";
+
+    public static final String ACTION_COVER_UPDATED = "cc.winboll.studio.gallery.COVER_UPDATED";
+
     private static final int DEFAULT_BG_TYPE = 0;
     private static final int DEFAULT_SORT_MODE = 0;
+    private static final int DEFAULT_COVER_WIDTH = 240;
+    private static final int DEFAULT_COVER_HEIGHT = 120;
+    private static final float DEFAULT_COVER_RATIO = 2.0f;
     private static final String DEFAULT_PATH = "/storage/emulated/0/Pictures/Gallery/owner";
     
     public static final int SORT_TIME_DESC = 0;
@@ -57,4 +66,28 @@ public class Preferences {
         LogUtils.d(TAG, "setAlbumSortMode: " + mode);
         prefs.edit().putInt(KEY_ALBUM_SORT_MODE, mode).apply();
     }
+    
+    public int getCoverWidth() {
+        return prefs.getInt(KEY_COVER_WIDTH, DEFAULT_COVER_WIDTH);
+    }
+    
+    public void setCoverWidth(int width) {
+        prefs.edit().putInt(KEY_COVER_WIDTH, width).apply();
+    }
+    
+    public int getCoverHeight() {
+        return prefs.getInt(KEY_COVER_HEIGHT, DEFAULT_COVER_HEIGHT);
+    }
+    
+    public void setCoverHeight(int height) {
+        prefs.edit().putInt(KEY_COVER_HEIGHT, height).apply();
+    }
+    
+    public float getCoverRatio() {
+        return prefs.getFloat(KEY_COVER_RATIO, DEFAULT_COVER_RATIO);
+    }
+    
+    public void setCoverRatio(float ratio) {
+        prefs.edit().putFloat(KEY_COVER_RATIO, ratio).apply();
+    }
 }

gallery/src/main/java/cc/winboll/studio/gallery/ZoomContainerView.java

@@ -0,0 +1,169 @@
+package cc.winboll.studio.gallery;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.util.AttributeSet;
+import android.view.GestureDetector;
+import android.view.MotionEvent;
+import android.view.ScaleGestureDetector;
+import android.view.View;
+import android.widget.FrameLayout;
+
+public class ZoomContainerView extends FrameLayout {
+    private float scaleFactor = 1.0f;
+    private float minScale = 0.1f;
+    private float maxScale = 5.0f;
+    private static final float ZOOM_STEP = 0.25f;
+    
+    private ScaleGestureDetector scaleGestureDetector;
+    private GestureDetector gestureDetector;
+    private Paint borderPaint;
+    
+    public ZoomContainerView(Context context) {
+        super(context);
+        init();
+    }
+    
+    public ZoomContainerView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init();
+    }
+    
+    public ZoomContainerView(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        init();
+    }
+    
+    private void init() {
+        setWillNotDraw(false);
+        setBackgroundColor(Color.YELLOW);
+        
+        borderPaint = new Paint();
+        borderPaint.setColor(Color.parseColor("#333333"));
+        borderPaint.setStyle(Paint.Style.STROKE);
+        borderPaint.setStrokeWidth(2);
+        
+        scaleGestureDetector = new ScaleGestureDetector(getContext(), new ScaleGestureDetector.SimpleOnScaleGestureListener() {
+            @Override
+            public boolean onScale(ScaleGestureDetector detector) {
+                scaleFactor *= detector.getScaleFactor();
+                scaleFactor = Math.max(minScale, Math.min(scaleFactor, maxScale));
+                invalidate();
+                requestLayout();
+                return true;
+            }
+        });
+        
+        gestureDetector = new GestureDetector(getContext(), new GestureDetector.SimpleOnGestureListener() {
+            @Override
+            public boolean onDoubleTap(MotionEvent e) {
+                if (scaleFactor > 1.5f) {
+                    scaleFactor = 1.0f;
+                } else {
+                    scaleFactor = 2.0f;
+                }
+                invalidate();
+                requestLayout();
+                return true;
+            }
+        });
+    }
+    
+    public void zoomIn() {
+        scaleFactor = Math.min(maxScale, scaleFactor + ZOOM_STEP);
+        requestMeasure();
+    }
+    
+    public void zoomOut() {
+        scaleFactor = Math.max(minScale, scaleFactor - ZOOM_STEP);
+        requestMeasure();
+    }
+    
+    private void requestMeasure() {
+        removeCallbacks(measureRunable);
+        post(measureRunable);
+    }
+    
+    private Runnable measureRunable = new Runnable() {
+        @Override
+        public void run() {
+            requestLayout();
+            invalidate();
+        }
+    };
+    
+    public float getScaleFactor() {
+        return scaleFactor;
+    }
+    
+    public void setScaleFactor(float scale) {
+        scaleFactor = Math.max(minScale, Math.min(scale, maxScale));
+        int childCount = getChildCount();
+        if (childCount > 0) {
+            View child = getChildAt(0);
+            if (child instanceof CropCanvasView) {
+                ((CropCanvasView) child).setContainerScale(scaleFactor);
+            }
+        }
+        requestLayout();
+        invalidate();
+    }
+    
+    public void resetZoom() {
+        scaleFactor = 1.0f;
+        invalidate();
+        requestLayout();
+    }
+    
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        int childCount = getChildCount();
+        if (childCount > 0) {
+            View child = getChildAt(0);
+            child.measure(widthMeasureSpec, heightMeasureSpec);
+            int childW = child.getMeasuredWidth();
+            int childH = child.getMeasuredHeight();
+            int scaledW = (int) (childW * scaleFactor);
+            int scaledH = (int) (childH * scaleFactor);
+            int widthSpec = MeasureSpec.makeMeasureSpec(scaledW, MeasureSpec.EXACTLY);
+            int heightSpec = MeasureSpec.makeMeasureSpec(scaledH, MeasureSpec.EXACTLY);
+            child.measure(widthSpec, heightSpec);
+            setMeasuredDimension(scaledW, scaledH);
+        } else {
+            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+        }
+    }
+    
+    @Override
+    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
+        int childCount = getChildCount();
+        if (childCount > 0) {
+            View child = getChildAt(0);
+            int childW = child.getMeasuredWidth();
+            int childH = child.getMeasuredHeight();
+            int scaledW = (int) (childW * scaleFactor);
+            int scaledH = (int) (childH * scaleFactor);
+            int parentW = right - left;
+            int parentH = bottom - top;
+            int childLeft = (parentW - scaledW) / 2;
+            int childTop = (parentH - scaledH) / 2;
+            child.layout(childLeft, childTop, childLeft + scaledW, childTop + scaledH);
+        }
+    }
+    
+    @Override
+    protected void onDraw(Canvas canvas) {
+        super.onDraw(canvas);
+    }
+    
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+        boolean handled = scaleGestureDetector.onTouchEvent(event);
+        if (!scaleGestureDetector.isInProgress()) {
+            handled = gestureDetector.onTouchEvent(event) || handled;
+        }
+        return handled || super.onTouchEvent(event);
+    }
+}

gallery/src/main/res/drawable/bg_color_circle.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="oval">
+    <solid android:color="@android:color/transparent"/>
+    <stroke android:width="2dp" android:color="@android:color/white"/>
+    <size android:width="32dp" android:height="32dp"/>
+</shape>

gallery/src/main/res/drawable/bg_color_circle_border.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="oval">
+    <stroke android:width="2dp" android:color="@android:color/white"/>
+    <size android:width="36dp" android:height="36dp"/>
+</shape>

gallery/src/main/res/drawable/bg_dialog.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <solid android:color="@android:color/black"/>
+    <stroke android:width="2dp" android:color="@android:color/white"/>
+</shape>

gallery/src/main/res/drawable/ic_close.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M19,6.41L17.59,5 12,10.59 6.41,5 5,6.41 10.59,12 5,17.59 6.41,19 12,13.41 17.59,19 19,17.59 13.41,12z"/>
+</vector>

gallery/src/main/res/drawable/ic_color_pick.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M20.71,5.63l-2.34,-2.34c-0.39,-0.39 -1.02,-0.39 -1.41,0l-3.12,3.12 -1.93,-1.91 -1.41,1.41 1.42,1.42L3,16.25V21h4.75l8.92,-8.92 1.42,1.42 1.41,-1.41 -1.92,-1.92 3.12,-3.12c0.4,-0.4 0.4,-1.03 0.01,-1.42zM6.92,19H5v-1.92l8.06,-8.06 1.92,1.92L6.92,19z"/>
+</vector>

gallery/src/main/res/drawable/ic_done.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M9,16.17L4.83,12l-1.42,1.41L9,19 21,7l-1.41,-1.41z"/>
+</vector>

gallery/src/main/res/drawable/ic_zoom_in.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M19,13h-6v6h-2v-6H5v-2h6V5h2v6h6v2z"/>
+</vector>

gallery/src/main/res/drawable/ic_zoom_out.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M19,13H5v-2h14v2z"/>
+</vector>

gallery/src/main/res/layout/activity_about.xml

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="vertical">
+
+        <com.google.android.material.appbar.AppBarLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
+        
+            <androidx.appcompat.widget.Toolbar
+                android:id="@+id/toolbar"
+                android:layout_width="match_parent"
+                android:layout_height="?attr/actionBarSize"
+                app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>
+
+        </com.google.android.material.appbar.AppBarLayout>
+
+        <cc.winboll.studio.libappbase.views.AboutView
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:id="@+id/aboutview"/>
+
+    </LinearLayout>
+
+</FrameLayout>

gallery/src/main/res/layout/activity_crop.xml

@@ -0,0 +1,131 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@color/black">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="56dp"
+        android:orientation="horizontal"
+        android:gravity="center_vertical"
+        android:background="@color/colorPrimary"
+        android:paddingHorizontal="16dp">
+
+        <ImageView
+            android:id="@+id/btn_close"
+            android:layout_width="48dp"
+            android:layout_height="48dp"
+            android:padding="12dp"
+            android:src="@drawable/ic_close"
+            android:background="?attr/selectableItemBackgroundBorderless"/>
+
+        <FrameLayout
+            android:id="@+id/color_icon_container"
+            android:layout_width="40dp"
+            android:layout_height="40dp"
+            android:layout_marginStart="8dp"
+            android:background="@android:color/transparent">
+
+            <View
+                android:id="@+id/color_view"
+                android:layout_width="32dp"
+                android:layout_height="32dp"
+                android:layout_gravity="center"
+                android:background="@drawable/bg_color_circle"/>
+
+        </FrameLayout>
+
+        <ImageView
+            android:id="@+id/btn_color_pick"
+            android:layout_width="48dp"
+            android:layout_height="48dp"
+            android:padding="12dp"
+            android:src="@drawable/ic_color_pick"
+            android:background="?attr/selectableItemBackgroundBorderless"/>
+
+        <View
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:layout_weight="1"/>
+
+        <ImageView
+            android:id="@+id/btn_info"
+            android:layout_width="48dp"
+            android:layout_height="48dp"
+            android:padding="12dp"
+            android:src="@drawable/ic_info"
+            android:background="?attr/selectableItemBackgroundBorderless"/>
+
+        <ImageView
+            android:id="@+id/btn_done"
+            android:layout_width="48dp"
+            android:layout_height="48dp"
+            android:padding="12dp"
+            android:src="@drawable/ic_done"
+            android:background="?attr/selectableItemBackgroundBorderless"/>
+
+    </LinearLayout>
+
+    <ScrollView
+        android:id="@+id/scroll_view"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_marginTop="56dp"
+        android:layout_marginBottom="56dp"
+        android:fillViewport="true">
+
+        <cc.winboll.studio.gallery.ZoomContainerView
+            android:id="@+id/zoom_container"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:layout_gravity="center">
+
+            <cc.winboll.studio.gallery.CropCanvasView
+                android:id="@+id/crop_canvas_view"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"/>
+
+        </cc.winboll.studio.gallery.ZoomContainerView>
+
+    </ScrollView>
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="56dp"
+        android:layout_gravity="bottom"
+        android:orientation="horizontal"
+        android:gravity="center_vertical"
+        android:background="@color/colorPrimary"
+        android:paddingHorizontal="16dp"
+        android:layout_marginBottom="0dp">
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="缩小"
+            android:textColor="@android:color/white"
+            android:textSize="12sp"/>
+
+        <SeekBar
+            android:id="@+id/seekbar_zoom"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:min="0"
+            android:max="100"
+            android:progress="50"
+            android:layout_marginHorizontal="8dp"/>
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="放大"
+            android:textColor="@android:color/white"
+            android:textSize="12sp"/>
+
+    </LinearLayout>
+
+</FrameLayout>

gallery/src/main/res/layout/dialog_crop_info.xml

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical"
+    android:padding="16dp"
+    android:background="@drawable/bg_dialog">
+
+    <TextView
+        android:id="@+id/info_text"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:textSize="14sp"
+        android:fontFamily="monospace"
+        android:textColor="@android:color/white"/>
+
+    <ImageView
+        android:id="@+id/preview_image"
+        android:layout_width="match_parent"
+        android:layout_height="200dp"
+        android:layout_marginTop="16dp"
+        android:scaleType="fitCenter"
+        android:background="@android:color/black"/>
+
+</LinearLayout>

gallery/src/main/res/layout/item_color_icon.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="40dp"
+    android:layout_height="40dp">
+
+    <View
+        android:id="@+id/color_view"
+        android:layout_width="32dp"
+        android:layout_height="32dp"
+        android:layout_gravity="center"
+        android:background="@drawable/bg_color_circle"/>
+
+    <View
+        android:layout_width="36dp"
+        android:layout_height="36dp"
+        android:layout_gravity="center"
+        android:background="@drawable/bg_color_circle_border"/>
+
+</FrameLayout>

gallery/src/main/res/menu/menu_crop.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+    <item
+        android:id="@+id/action_done"
+        android:title="完成"
+        app:showAsAction="always"/>
+</menu>

gallery/src/main/res/menu/menu_main.xml

@@ -13,8 +13,8 @@
         app:showAsAction="never"/>
     
     <item
-        android:id="@+id/action_refresh"
+        android:id="@+id/action_about"
-        android:title="@string/refresh"
+        android:title="@string/about"
         app:showAsAction="never"/>
     
     <item

gallery/src/main/res/values/strings.xml

@@ -1,8 +1,10 @@
 <resources>
     <string name="app_name">Gallery</string>
+    <string name="app_description">WinBoLL Album App</string>
     <string name="refresh">Refresh</string>
     <string name="settings">Settings</string>
     <string name="settings_title">Settings</string>
+    <string name="about">About</string>
     <string name="folder_path">Folder Path</string>
     <string name="enter_folder_path">Enter folder path</string>
     <string name="save">Save</string>
@@ -16,4 +18,4 @@
     <string name="no">No</string>
     <string name="debug_log">Debug Log</string>
     <string name="debug_message">Debug log message</string>
-</resources>
+</resources>