<gallery>APK 15.0.13 release Publish.

- CropCanvasView: 将画布背景从固定的 Color.BLUE 改为支持 3 种背景类型
  (灰白棋盘格 / 全白 / 全黑)，与 ImageViewerActivity 保持一致
  - 新增 bgType 字段、setBackgroundType() / getBackgroundType() 方法
  - 新增 drawBackground() 统一绘制方法，用于 onDraw() 和 getCanvasBitmap()
  - 棋盘格使用 Drawable.draw() 渲染 Vector 到 Bitmap，再通过 BitmapShader 平铺

- CropActivity: 从 Preferences 读取保存的 bgType 并应用到画布
  - 将颜色拾取按钮替换为背景选择按钮 (ic_bg)，弹出单选对话框切换背景
  - 切换时调用 prefs.setBgType() 保存，与图片浏览窗口共享同一数据源
  - 工具栏颜色指示器随背景类型更新
  - 剪裁信息对话框改为显示背景类型名称

gallery/build.properties

@@ -1,8 +1,8 @@
 #Created by .winboll/winboll_app_build.gradle
-#Tue Apr 28 17:21:55 HKT 2026
-stageCount=10
+#Fri May 01 09:21:07 HKT 2026
+stageCount=14
 libraryProject=
 baseVersion=15.0
-publishVersion=15.0.9
+publishVersion=15.0.13
 buildCount=0
-baseBetaVersion=15.0.10
+baseBetaVersion=15.0.14

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

@@ -130,7 +130,7 @@ public class AlbumAdapter extends RecyclerView.Adapter<AlbumAdapter.ViewHolder>
 private void showContextMenu(View view, final Album album) {
         android.app.AlertDialog.Builder builder = new android.app.AlertDialog.Builder(view.getContext());
         builder.setTitle(album.getName());
-        boolean isPinned = pinnedDbHelper != null && pinnedDbHelper.isPinned(album.getPath());
+        final boolean isPinned = pinnedDbHelper != null && pinnedDbHelper.isPinned(album.getPath());
         String[] items = isPinned ? new String[]{"取消置顶"} : new String[]{"置顶"};
         builder.setItems(items, new android.content.DialogInterface.OnClickListener() {
             @Override
@@ -252,4 +252,4 @@ private void showContextMenu(View view, final Album album) {
             imageCount = itemView.findViewById(R.id.image_count);
         }
     }
-}
+}

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

@@ -3,6 +3,7 @@ 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;
@@ -42,6 +43,7 @@ public class CropActivity extends AppCompatActivity {
     private int cropWidth = 240;
     private int cropHeight = 120;
     private float cropRatio = 2.0f;
+    private Preferences prefs;
     
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -53,7 +55,8 @@ public class CropActivity extends AppCompatActivity {
         cropWidth = getIntent().getIntExtra(EXTRA_CROP_WIDTH, 240);
         cropHeight = getIntent().getIntExtra(EXTRA_CROP_HEIGHT, 120);
         
-        Preferences prefs = new Preferences(this);
+        prefs = new Preferences(this);
+        int bgType = prefs.getBgType();
         if (cropWidth > 0 && cropHeight > 0) {
             cropRatio = (float) cropWidth / cropHeight;
         } else {
@@ -69,13 +72,12 @@ public class CropActivity extends AppCompatActivity {
             }
         });
         
-        final ImageView btnColorPick = findViewById(R.id.btn_color_pick);
-        btnColorPick.setOnClickListener(new View.OnClickListener() {
+        final ImageView btnBg = findViewById(R.id.btn_color_pick);
+        btnBg.setImageResource(R.drawable.ic_bg);
+        btnBg.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-                boolean pickMode = !cropCanvasView.isColorPickMode();
-                cropCanvasView.setColorPickMode(pickMode);
-                btnColorPick.setAlpha(pickMode ? 0.5f : 1.0f);
+                showBgDialog();
             }
         });
         
@@ -115,38 +117,57 @@ public class CropActivity extends AppCompatActivity {
         cropCanvasView = findViewById(R.id.crop_canvas_view);
         
         final View colorView = findViewById(R.id.color_view);
+        final GradientDrawable colorDrawable = (GradientDrawable) colorView.getBackground();
+        
+        cropCanvasView.setBackgroundType(bgType);
+        updateColorView(colorDrawable, bgType);
+        
         cropCanvasView.setOnBackgroundColorChangedListener(new CropCanvasView.OnBackgroundColorChangedListener() {
             @Override
             public void onBackgroundColorChanged(int color) {
-                colorView.setBackgroundColor(color);
             }
         });
         
-        cropCanvasView.setOnColorPickedListener(new CropCanvasView.OnColorPickedListener() {
-            @Override
-            public void onColorPicked(int color) {
-                int pickX = cropCanvasView.getLastPickImageX();
-                int pickY = cropCanvasView.getLastPickImageY();
-                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);
-            }
-        });
-        
-        colorView.setBackgroundColor(cropCanvasView.getBackgroundColor());
-        
         loadImage();
     }
     
+    private void updateColorView(GradientDrawable drawable, int bgType) {
+        switch (bgType) {
+            case 0:
+                drawable.setColor(0xFF808080);
+                break;
+            case 1:
+                drawable.setColor(0xFFFFFFFF);
+                break;
+            case 2:
+            default:
+                drawable.setColor(0xFF000000);
+                break;
+        }
+    }
+    
+    private void showBgDialog() {
+        final String[] bgNames = {"灰白相间", "全白", "全黑"};
+        final int[] bgDrawables = {R.drawable.bg_checkerboard, R.drawable.bg_white, R.drawable.bg_black};
+        final View colorView = findViewById(R.id.color_view);
+        final GradientDrawable colorDrawable = (GradientDrawable) colorView.getBackground();
+        final int currentBgType = cropCanvasView.getBackgroundType();
+        
+        new AlertDialog.Builder(this)
+            .setTitle("选择背景")
+            .setSingleChoiceItems(bgNames, currentBgType, new android.content.DialogInterface.OnClickListener() {
+                @Override
+                public void onClick(android.content.DialogInterface dialog, int which) {
+                    cropCanvasView.setBackgroundType(which);
+                    prefs.setBgType(which);
+                    updateColorView(colorDrawable, which);
+                    dialog.dismiss();
+                }
+            })
+            .setNegativeButton("取消", null)
+            .show();
+    }
+    
     private void loadImage() {
         try {
             if (imagePath != null && new File(imagePath).exists()) {
@@ -258,7 +279,9 @@ public class CropActivity extends AppCompatActivity {
         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");
+        info.append("\n=== 背景类型 ===\n");
+        String[] bgNames = {"灰白相间", "全白", "全黑"};
+        info.append("背景: ").append(bgNames[cropCanvasView.getBackgroundType()]).append("\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(",")

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

@@ -2,11 +2,14 @@ package cc.winboll.studio.gallery;
 
 import android.content.Context;
 import android.graphics.Bitmap;
+import android.graphics.BitmapShader;
 import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Matrix;
 import android.graphics.Paint;
 import android.graphics.RectF;
+import android.graphics.Shader;
+import android.graphics.drawable.Drawable;
 import android.util.AttributeSet;
 import android.view.MotionEvent;
 import android.view.View;
@@ -71,6 +74,10 @@ public class CropCanvasView extends View {
     private Bitmap displayBitmap;
     private RectF initialSpanRect;
     private float initialSpan;
+    private int bgType = 2;
+    private Bitmap tileBitmap;
+    private BitmapShader tileShader;
+    private Paint bgPaint;
     private int backgroundColor = Color.BLUE;
     private boolean colorPickMode = false;
     private int previewColor = 0;
@@ -111,6 +118,60 @@ public class CropCanvasView extends View {
         cornerPaint = new Paint();
         cornerPaint.setColor(Color.WHITE);
         cornerPaint.setStyle(Paint.Style.FILL);
+        
+        bgType = 2;
+        bgPaint = new Paint();
+        initTileBitmap();
+    }
+    
+    private void initTileBitmap() {
+        if (tileBitmap != null && !tileBitmap.isRecycled()) {
+            tileBitmap.recycle();
+            tileBitmap = null;
+        }
+        tileShader = null;
+        
+        if (bgType == 0) {
+            Drawable drawable = getContext().getDrawable(R.drawable.bg_checkerboard);
+            if (drawable != null) {
+                int w = drawable.getIntrinsicWidth();
+                int h = drawable.getIntrinsicHeight();
+                if (w <= 0) w = 10;
+                if (h <= 0) h = 10;
+                tileBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
+                Canvas c = new Canvas(tileBitmap);
+                drawable.setBounds(0, 0, w, h);
+                drawable.draw(c);
+                tileShader = new BitmapShader(tileBitmap, Shader.TileMode.REPEAT, Shader.TileMode.REPEAT);
+            }
+        }
+    }
+    
+    public void setBackgroundType(int type) {
+        if (bgType != type) {
+            bgType = type;
+            initTileBitmap();
+            invalidate();
+        }
+    }
+    
+    public int getBackgroundType() {
+        return bgType;
+    }
+    
+    private void drawBackground(Canvas canvas) {
+        if (bgType == 0 && tileShader != null) {
+            bgPaint.setShader(tileShader);
+            canvas.drawRect(canvasBounds, bgPaint);
+        } else if (bgType == 1) {
+            bgPaint.setShader(null);
+            bgPaint.setColor(Color.WHITE);
+            canvas.drawRect(canvasBounds, bgPaint);
+        } else {
+            bgPaint.setShader(null);
+            bgPaint.setColor(Color.BLACK);
+            canvas.drawRect(canvasBounds, bgPaint);
+        }
     }
     
     public void setImageBitmap(Bitmap bitmap) {
@@ -175,7 +236,7 @@ public class CropCanvasView extends View {
         }
         Bitmap canvasBmp = Bitmap.createBitmap(canvasWidth, canvasHeight, Bitmap.Config.ARGB_8888);
         Canvas canvas = new Canvas(canvasBmp);
-        canvas.drawColor(backgroundColor);
+        drawBackground(canvas);
         if (displayBitmap != null && !displayBitmap.isRecycled()) {
             if (displayBitmap == originalBitmap) {
                 canvas.drawBitmap(displayBitmap, imageBounds.left, imageBounds.top, imagePaint);
@@ -409,7 +470,7 @@ public class CropCanvasView extends View {
             getDisplayMatrix(matrix);
             canvas.concat(matrix);
             
-            canvas.drawColor(backgroundColor);
+            drawBackground(canvas);
             
             if (displayBitmap == originalBitmap) {
                 canvas.drawBitmap(displayBitmap, imageBounds.left, imageBounds.top, imagePaint);
@@ -518,7 +579,15 @@ public class CropCanvasView extends View {
         if (colorPickMode) {
             if (event.getAction() == MotionEvent.ACTION_DOWN || event.getAction() == MotionEvent.ACTION_MOVE) {
                 if (originalBitmap != null && !originalBitmap.isRecycled()) {
-                    previewColor = getImageColorAt(x, y);
+                    float imgX = screenToImageX(x);
+                    float imgY = screenToImageY(y);
+                    if (imageBounds.contains(imgX, imgY)) {
+                        previewColor = getImageColorAt(x, y);
+                    } else if (canvasBounds.contains(x, y)) {
+                        previewColor = (bgType == 1) ? Color.WHITE : Color.BLACK;
+                    } else {
+                        previewColor = Color.TRANSPARENT;
+                    }
                     lastPickX = x;
                     lastPickY = y;
                     if (backgroundColorChangedListener != null) {
@@ -528,10 +597,19 @@ public class CropCanvasView extends View {
                 return true;
             }
             if (event.getAction() == MotionEvent.ACTION_UP) {
-                if (previewColor != 0 && previewColor != Color.TRANSPARENT) {
-                    backgroundColor = previewColor;
+                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 = (bgType == 1) ? Color.WHITE : Color.BLACK;
+                    }
                     if (colorPickedListener != null) {
-                        colorPickedListener.onColorPicked(backgroundColor);
+                        colorPickedListener.onColorPicked(pickedColor);
                     }
                 }
                 if (colorPickEndListener != null) {

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

@@ -118,7 +118,7 @@ public class ImageAdapter extends RecyclerView.Adapter<ImageAdapter.ViewHolder>
         notifyDataSetChanged();
     }
     
-    private void showContextMenu(View view, final int position) {
+    private void showContextMenu(final 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)};
@@ -244,4 +244,4 @@ public class ImageAdapter extends RecyclerView.Adapter<ImageAdapter.ViewHolder>
             coverIcon = itemView.findViewById(R.id.cover_icon);
         }
     }
-}
+}

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

@@ -12,6 +12,7 @@ import android.view.View;
 import android.view.View.OnTouchListener;
 import android.view.WindowManager;
 import android.widget.ImageButton;
+import android.widget.Toast;
 import androidx.viewpager.widget.ViewPager;
 import java.io.File;
 import java.util.ArrayList;
@@ -34,6 +35,7 @@ public class ImageViewerActivity extends Activity implements ViewPager.OnPageCha
     private ImageButton btnShare;
     private ImageButton btnInfo;
     private ImageButton btnBg;
+    private ImageButton btnGallery;
     private int bgType = 0;
     private GestureDetector gestureDetector;
     private TrashManager trashManager;
@@ -63,6 +65,8 @@ public class ImageViewerActivity extends Activity implements ViewPager.OnPageCha
         btnInfo = findViewById(R.id.btn_info);
         btnBg = findViewById(R.id.btn_bg);
         
+        btnGallery = findViewById(R.id.btn_gallery);
+        
         applyBg();
         
         ImagePagerAdapter adapter = new ImagePagerAdapter(imageUrls, bgType);
@@ -119,6 +123,20 @@ public class ImageViewerActivity extends Activity implements ViewPager.OnPageCha
                 switchBg();
             }
         });
+        
+        btnGallery.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Toast.makeText(ImageViewerActivity.this, "Gallery", Toast.LENGTH_SHORT).show();
+                if (imageUrls != null && currentPosition >= 0 && currentPosition < imageUrls.size()) {
+                    Uri imageUri = imageUrls.get(currentPosition);
+                    Intent intent = new Intent(Intent.ACTION_VIEW);
+                    intent.setDataAndType(imageUri, "image/*");
+                    intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
+                    startActivity(Intent.createChooser(intent, "打开相册"));
+                }
+            }
+        });
     }
     
     private void toggleToolbar() {

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

@@ -289,7 +289,13 @@ private void loadAlbums() {
     @Override
     public boolean onOptionsItemSelected(@NonNull MenuItem item) {
         int id = item.getItemId();
-        if (id == R.id.action_settings) {
+        if (id == R.id.action_mi_gallery) {
+            Toast.makeText(this, "Gallery clicked", Toast.LENGTH_SHORT).show();
+            Intent intent = new Intent(Intent.ACTION_MAIN);
+            intent.addCategory(Intent.CATEGORY_APP_GALLERY);
+            startActivity(intent);
+            return true;
+        } else if (id == R.id.action_settings) {
             startActivity(new Intent(this, SettingsActivity.class));
             return true;
         } else if (id == R.id.action_about) {

gallery/src/main/java/cc/winboll/studio/gallery/dialog/ColorPaletteDialog.java

@@ -0,0 +1,44 @@
+package cc.winboll.studio.gallery.dialog;
+
+import android.app.Dialog;
+import android.content.Context;
+import android.os.Bundle;
+import android.view.WindowManager;
+import android.widget.TextView;
+import androidx.annotation.NonNull;
+import cc.winboll.studio.gallery.R;
+
+/**
+ * 颜色表对话框
+ * 继承于普通对话框类，使用视图文件
+ */
+public class ColorPaletteDialog extends Dialog {
+
+    public ColorPaletteDialog(@NonNull Context context) {
+        super(context, R.style.ColorPaletteDialog);
+    }
+
+    public ColorPaletteDialog(@NonNull Context context, int themeResId) {
+        super(context, themeResId);
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        // super.onCreate(savedInstanceState);
+        setContentView(R.layout.dialog_color_palette);
+        
+        TextView titleText = findViewById(R.id.title_text);
+        
+        WindowManager.LayoutParams params = getWindow().getAttributes();
+        params.width = WindowManager.LayoutParams.MATCH_PARENT;
+        getWindow().setAttributes(params);
+    }
+
+    public void setTitle(String title) {
+        
+    }
+
+    public interface OnColorItemClick {
+        void onColorClick(int color);
+    }
+}

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

@@ -1,6 +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/holo_green_dark"/>
+    <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/ic_cover.xml

@@ -5,9 +5,9 @@
     android:viewportWidth="24"
     android:viewportHeight="24">
     <path
-        android:fillColor="#000000"
+        android:fillColor="#FFFFFF"
         android:pathData="M21,3H3C1.9,3 1,3.9 1,5v14c0,1.1 0.9,2 2,2h18c1.1,0 2,-0.9 2,-2V5C23,3.9 22.1,3 21,3zM21,19H3V5h18V19z"/>
     <path
-        android:fillColor="#000000"
+        android:fillColor="#FFFFFF"
         android:pathData="M9,12l2,2l4,-4l1.5,1.5L11,17l-3,-3z"/>
 </vector>

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

@@ -0,0 +1,16 @@
+<?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="#000000"
+        android:pathData="M12,2C6.48,2 2,6.48 2,12s4.48,10 10,10s10,-4.48 10,-10S17.52,2 12,2zM12,20c-4.41,0 -8,-3.59 -8,-8s3.59,-8 8,-8s8,3.59 8,8s-3.59,8 -8,8z"/>
+    <path
+        android:fillColor="#000000"
+        android:pathData="M12,7c-2.76,0 -5,2.24 -5,5s2.24,5 5,5s5,-2.24 5,-5s-2.24,-5 -5,-5zM12,15c-1.66,0 -3,-1.34 -3,-3s1.34,-3 3,-3s3,1.34 3,3s-1.34,3 -3,3z"/>
+    <path
+        android:fillColor="#000000"
+        android:pathData="M8,12l1.5,-2l2,2.5l2.5,-3l2,2.5"/>
+</vector>

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

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportHeight="24"
+    android:viewportWidth="24">
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M1,3V21H23V3H1M21,5V14H3V5H21M11,16V19H8V16H11M3,16H6V19H3V16M13,19V16H16V19H13M18,19V16H21V19H18Z"/>
+
+</vector>

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

@@ -15,17 +15,30 @@
 
         <ImageView
             android:id="@+id/btn_close"
-            android:layout_width="48dp"
-            android:layout_height="48dp"
-            android:padding="12dp"
+            android:layout_width="40dp"
+            android:layout_height="40dp"
+            android:padding="5dp"
             android:src="@drawable/ic_close"
             android:background="?attr/selectableItemBackgroundBorderless"/>
 
+        <TextView
+            android:id="@+id/textview_window_name"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="封面剪裁"
+            android:textColor="@android:color/white"
+            android:textSize="18sp"
+            android:layout_gravity="center_vertical"
+            android:layout_weight="1"
+            android:gravity="center"
+            android:layout_marginEnd="8dp"/>
+
         <FrameLayout
             android:id="@+id/color_icon_container"
             android:layout_width="40dp"
             android:layout_height="40dp"
-            android:layout_marginStart="8dp">
+            android:layout_marginStart="8dp"
+            android:background="@android:color/transparent">
 
             <View
                 android:id="@+id/color_view"
@@ -34,19 +47,13 @@
                 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>
 
         <ImageView
             android:id="@+id/btn_color_pick"
-            android:layout_width="48dp"
-            android:layout_height="48dp"
-            android:padding="12dp"
+            android:layout_width="40dp"
+            android:layout_height="40dp"
+            android:padding="5dp"
             android:src="@drawable/ic_color_pick"
             android:background="?attr/selectableItemBackgroundBorderless"/>
 
@@ -57,17 +64,17 @@
 
         <ImageView
             android:id="@+id/btn_info"
-            android:layout_width="48dp"
-            android:layout_height="48dp"
-            android:padding="12dp"
+            android:layout_width="40dp"
+            android:layout_height="40dp"
+            android:padding="5dp"
             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:layout_width="40dp"
+            android:layout_height="40dp"
+            android:padding="5dp"
             android:src="@drawable/ic_done"
             android:background="?attr/selectableItemBackgroundBorderless"/>
 

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

@@ -36,6 +36,14 @@
             android:layout_height="0dp"
             android:layout_weight="1"/>
 
+        <ImageButton
+            android:id="@+id/btn_gallery"
+            android:layout_width="48dp"
+            android:layout_height="48dp"
+            android:background="?attr/selectableItemBackgroundBorderless"
+            android:src="@drawable/ic_view_gallery_outline"
+            android:contentDescription="Gallery"/>
+
         <ImageButton
             android:id="@+id/btn_share"
             android:layout_width="48dp"

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

@@ -0,0 +1,16 @@
+<?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="wrap_content"
+    android:background="@drawable/bg_dialog"
+    android:padding="16dp">
+
+    <TextView
+        android:id="@+id/title_text"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:textSize="16sp"
+        android:textColor="@android:color/white"
+        android:textStyle="bold"/>
+
+</FrameLayout>

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

@@ -2,6 +2,12 @@
 <menu xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto">
     
+    <item
+        android:id="@+id/action_mi_gallery"
+        android:title="@string/mi_gallery"
+        android:icon="@drawable/ic_mi_gallery"
+        app:showAsAction="ifRoom"/>
+    
     <item
         android:id="@+id/action_trash"
         android:title="@string/trash"

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

@@ -18,4 +18,7 @@
     <string name="no">No</string>
     <string name="debug_log">Debug Log</string>
     <string name="debug_message">Debug log message</string>
+    <string name="system_gallery">系统相册</string>
+    <string name="mi_gallery">小米相册</string>
+    <string name="reset_gallery">重置</string>
 </resources>

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

@@ -8,4 +8,9 @@
         <item name="colorAccent">@color/colorAccent</item>
     </style>
 
+    <style name="ColorPaletteDialog" parent="Theme.AppCompat.Light.NoActionBar">
+        <item name="android:windowBackground">@android:color/transparent</item>
+        <item name="android:windowIsFloating">false</item>
+    </style>
+
 </resources>