<gallery>APK 15.0.7 release Publish.

- 双指缩放裁剪框时添加边界检测
- 裁剪框超出边界时停止放大，保持在画布内

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:15.15.20'
 	
 	// 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 23:52:51 HKT 2026
+#Tue Apr 28 10:57:44 HKT 2026
-stageCount=7
+stageCount=8
 libraryProject=
 baseVersion=15.0
-publishVersion=15.0.6
+publishVersion=15.0.7
 buildCount=0
-baseBetaVersion=15.0.7
+baseBetaVersion=15.0.8

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

@@ -5,14 +5,18 @@ import android.graphics.BitmapFactory;
 import android.graphics.RectF;
 import android.net.Uri;
 import android.os.Bundle;
+import android.content.Intent;
 import android.provider.MediaStore;
 import android.view.View;
 import android.widget.ImageView;
+import android.widget.ScrollView;
+import android.widget.SeekBar;
 import android.widget.Toast;
 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";
@@ -23,6 +27,7 @@ public class CropActivity extends AppCompatActivity {
     public static final String EXTRA_CROP_HEIGHT = "crop_height";
     
     private CropCanvasView cropCanvasView;
+    private ZoomContainerView zoomContainer;
     private Bitmap originalBitmap;
     private String imagePath;
     private String albumPath;
@@ -73,6 +78,25 @@ public class CropActivity extends AppCompatActivity {
             }
         });
         
+        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);
         loadImage();
     }
@@ -118,37 +142,60 @@ public class CropActivity extends AppCompatActivity {
     }
     
     private void saveCroppedCover() {
-        Bitmap canvasBitmap = cropCanvasView.getCanvasBitmap();
+        if (originalBitmap == null || originalBitmap.isRecycled()) {
-        if (canvasBitmap == null) {
             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 cropX = (int) cropRect.left;
+            int bmpX = (int) cropRect.left;
-            int cropY = (int) cropRect.top;
+            int bmpY = (int) cropRect.top;
-            int cropW = (int) cropRect.width();
+            int bmpW = (int) cropRect.width();
-            int cropH = (int) cropRect.height();
+            int bmpH = (int) cropRect.height();
             
-            cropX = Math.max(0, Math.min(cropX, canvasBitmap.getWidth() - 1));
+            bmpX = Math.max(0, Math.min(bmpX, canvasBitmap.getWidth() - 1));
-            cropY = Math.max(0, Math.min(cropY, canvasBitmap.getHeight() - 1));
+            bmpY = Math.max(0, Math.min(bmpY, canvasBitmap.getHeight() - 1));
-            cropW = Math.max(1, Math.min(cropW, canvasBitmap.getWidth() - cropX));
+            bmpW = Math.max(1, Math.min(bmpW, canvasBitmap.getWidth() - bmpX));
-            cropH = Math.max(1, Math.min(cropH, canvasBitmap.getHeight() - cropY));
+            bmpH = Math.max(1, Math.min(bmpH, canvasBitmap.getHeight() - bmpY));
             
-            Bitmap cropped = Bitmap.createBitmap(canvasBitmap, cropX, cropY, cropW, cropH);
+            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());
             
-            File cacheDir = getCacheDir();
-            File coverFile = new File(cacheDir, "cover_" + System.currentTimeMillis() + ".png");
             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);

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

@@ -4,6 +4,7 @@ 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;
@@ -38,12 +39,19 @@ public class CropCanvasView extends View {
     private RectF imageBounds = new RectF();
     private RectF canvasBounds = new RectF();
     private Bitmap originalBitmap;
-    private Bitmap canvasBitmap;
+    private Bitmap displayBitmap;
+    private RectF initialSpanRect;
     private float initialSpan;
-    private int backgroundColor = Color.GREEN;
+    private int backgroundColor = Color.BLUE;
     private boolean colorPickMode = false;
     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();
@@ -74,7 +82,81 @@ public class CropCanvasView extends View {
     }
     
     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) {
@@ -100,33 +182,63 @@ public class CropCanvasView extends View {
         imageBounds.set(left, top, left + imageWidth, top + imageHeight);
         canvasBounds.set(0, 0, canvasWidth, canvasHeight);
         
-        cropRect = new RectF(0, 0, canvasWidth, canvasHeight);
+        cropRect = new RectF(canvasBounds);
-        
-        createCanvasBitmap();
         
         requestLayout();
         invalidate();
     }
     
-    private void createCanvasBitmap() {
+    public void getDisplayMatrix(Matrix matrix) {
-        if (canvasBitmap != null) {
+        if (canvasWidth <= 0 || canvasHeight <= 0 || getWidth() <= 0 || getHeight() <= 0) {
-            canvasBitmap.recycle();
+            return;
-        }
-        canvasBitmap = Bitmap.createBitmap(canvasWidth, canvasHeight, Bitmap.Config.ARGB_8888);
-        android.graphics.Canvas canvas = new android.graphics.Canvas(canvasBitmap);
-        canvas.drawColor(backgroundColor);
-        if (originalBitmap != null && !originalBitmap.isRecycled()) {
-            canvas.drawBitmap(originalBitmap, imageBounds.left, imageBounds.top, imagePaint);
         }
+        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 Bitmap getCanvasBitmap() {
+    public float screenToImageX(float screenX) {
-        return canvasBitmap;
+        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;
-        createCanvasBitmap();
         invalidate();
     }
     
@@ -194,6 +306,14 @@ public class CropCanvasView extends View {
         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;
@@ -201,22 +321,76 @@ public class CropCanvasView extends View {
         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 (canvasBitmap != null && !canvasBitmap.isRecycled()) {
+        if (cropRect == null) return;
-            canvas.drawBitmap(canvasBitmap, 0, 0, null);
+        
+        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();
             }
             
-        if (cropRect != null) {
+            canvas.restore();
-            canvas.drawRect(cropRect, borderPaint);
             
+            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
@@ -240,8 +414,15 @@ public class CropCanvasView extends View {
                     newWidth = Math.max(minSize, Math.min(newWidth, canvasBounds.width()));
                     newHeight = newWidth / coverRatio;
                     
-                    cropRect.set(centerX - newWidth / 2, centerY - newHeight / 2,
+                    float newLeft = centerX - newWidth / 2;
-                               centerX + newWidth / 2, centerY + newHeight / 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();
@@ -253,6 +434,18 @@ public class CropCanvasView extends View {
         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) {
                 pickX = x;
@@ -281,11 +474,11 @@ public class CropCanvasView extends View {
                     float newRight = cropRect.right + dx;
                     float newBottom = cropRect.bottom + dy;
                     
-                    if (newLeft >= canvasBounds.left && newRight <= canvasBounds.right) {
+                    if (newLeft >= bounds.left && newRight <= bounds.right) {
                         cropRect.left = newLeft;
                         cropRect.right = newRight;
                     }
-                    if (newTop >= canvasBounds.top && newBottom <= canvasBounds.bottom) {
+                    if (newTop >= bounds.top && newBottom <= bounds.bottom) {
                         cropRect.top = newTop;
                         cropRect.bottom = newBottom;
                     }
@@ -387,14 +580,6 @@ public class CropCanvasView extends View {
     }
     
     public int getColorAt(float x, float y) {
-        if (canvasBitmap != null && !canvasBitmap.isRecycled()) {
+        return getImageColorAt(x, y);
-            int bitmapX = (int) x;
-            int bitmapY = (int) y;
-            if (bitmapX >= 0 && bitmapX < canvasBitmap.getWidth() && 
-                bitmapY >= 0 && bitmapY < canvasBitmap.getHeight()) {
-                return canvasBitmap.getPixel(bitmapX, bitmapY);
-            }
-        }
-        return Color.TRANSPARENT;
     }
 }

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;
@@ -192,13 +195,16 @@ 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) {
                     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) {
@@ -299,9 +305,19 @@ private void loadAlbums() {
         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();
@@ -313,6 +329,12 @@ private void loadAlbums() {
         }
     }
     
+    @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

@@ -13,6 +13,9 @@ public class Preferences {
     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;

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/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_crop.xml

@@ -34,23 +34,74 @@
             android:layout_height="0dp"
             android:layout_weight="1"/>
 
-        <TextView
+        <ImageView
             android:id="@+id/btn_done"
-            android:layout_width="wrap_content"
+            android:layout_width="48dp"
             android:layout_height="48dp"
-            android:text="完成"
+            android:padding="12dp"
-            android:textColor="@android:color/white"
+            android:src="@drawable/ic_done"
-            android:textSize="16sp"
-            android:gravity="center"
-            android:paddingHorizontal="16dp"
             android:background="?attr/selectableItemBackgroundBorderless"/>
 
     </LinearLayout>
 
-    <cc.winboll.studio.gallery.CropCanvasView
+    <ScrollView
-        android:id="@+id/crop_canvas_view"
+        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>