<gallery>APK 15.0.3 release Publish.

- 主界面相册集预览封面使用背景设置
- 相册浏览界面图片预览使用背景设置
- 返回界面时自动刷新背景设置

gallery/build.properties

@@ -1,8 +1,8 @@
 #Created by .winboll/winboll_app_build.gradle
-#Sat Apr 25 05:49:42 HKT 2026
-stageCount=1
+#Sat Apr 25 20:05:35 HKT 2026
+stageCount=4
 libraryProject=
 baseVersion=15.0
-publishVersion=15.0.0
+publishVersion=15.0.3
 buildCount=0
-baseBetaVersion=15.0.1
+baseBetaVersion=15.0.4

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

@@ -48,6 +48,7 @@ public class AlbumActivity extends AppCompatActivity {
         recyclerView = findViewById(R.id.recycler_view);
         recyclerView.setLayoutManager(new GridLayoutManager(this, 3));
         adapter = new ImageAdapter();
+        adapter.setContext(this);
         recyclerView.setAdapter(adapter);
         
         adapter.setOnImageClickListener(new OnImageClickListener() {
@@ -149,5 +150,8 @@ public class AlbumActivity extends AppCompatActivity {
         if (checkPermission()) {
             loadImages();
         }
+        if (adapter != null) {
+            adapter.refreshBg();
+        }
     }
 }

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

@@ -20,6 +20,21 @@ public class AlbumAdapter extends RecyclerView.Adapter<AlbumAdapter.ViewHolder>
     public static final String TAG = "AlbumAdapter";
     private ArrayList<Album> albums = new ArrayList<>();
     private OnAlbumClickListener listener;
+    private Preferences prefs;
+    private int bgType = 0;
+    
+    private int getBgRes() {
+        switch (bgType) {
+            case 0:
+                return R.drawable.bg_checkerboard;
+            case 1:
+                return R.drawable.bg_white;
+            case 2:
+                return R.drawable.bg_black;
+            default:
+                return R.drawable.bg_checkerboard;
+        }
+    }
 
     public interface OnAlbumClickListener {
         void onAlbumClick(Album album);
@@ -34,6 +49,18 @@ public class AlbumAdapter extends RecyclerView.Adapter<AlbumAdapter.ViewHolder>
         LogUtils.d(TAG, "setData: " + albums.size() + " albums");
         notifyDataSetChanged();
     }
+    
+    public void setContext(android.content.Context context) {
+        prefs = new Preferences(context);
+        bgType = prefs.getBgType();
+    }
+    
+    public void refreshBg() {
+        if (prefs != null) {
+            bgType = prefs.getBgType();
+            notifyDataSetChanged();
+        }
+    }
 
     @NonNull
     @Override
@@ -48,6 +75,8 @@ public class AlbumAdapter extends RecyclerView.Adapter<AlbumAdapter.ViewHolder>
         final Album album = albums.get(position);
         LogUtils.d(TAG, "bind: " + album.getName() + ", cover=" + album.getCoverUri());
         
+        holder.coverImage.setBackgroundResource(getBgRes());
+        
         holder.albumName.setText(album.getName());
         holder.imageCount.setText(album.getImageCount() + " photos");
         

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

@@ -18,6 +18,21 @@ public class ImageAdapter extends RecyclerView.Adapter<ImageAdapter.ViewHolder>
     private ArrayList<Uri> imageUrls = new ArrayList<>();
     private ArrayList<String> imagePaths = new ArrayList<>();
     private OnImageClickListener listener;
+    private int bgType = 0;
+    private Preferences prefs;
+    
+    private int getBgRes() {
+        switch (bgType) {
+            case 0:
+                return R.drawable.bg_checkerboard;
+            case 1:
+                return R.drawable.bg_white;
+            case 2:
+                return R.drawable.bg_black;
+            default:
+                return R.drawable.bg_checkerboard;
+        }
+    }
 
     public interface OnImageClickListener {
         void onImageClick(int position, ArrayList<Uri> urls, ArrayList<String> paths);
@@ -33,6 +48,18 @@ public class ImageAdapter extends RecyclerView.Adapter<ImageAdapter.ViewHolder>
         LogUtils.d(TAG, "setData: " + urls.size() + " images");
         notifyDataSetChanged();
     }
+    
+    public void setContext(android.content.Context context) {
+        prefs = new Preferences(context);
+        bgType = prefs.getBgType();
+    }
+    
+    public void refreshBg() {
+        if (prefs != null) {
+            bgType = prefs.getBgType();
+            notifyDataSetChanged();
+        }
+    }
 
     @NonNull
     @Override
@@ -44,6 +71,8 @@ public class ImageAdapter extends RecyclerView.Adapter<ImageAdapter.ViewHolder>
 
     @Override
     public void onBindViewHolder(@NonNull ViewHolder holder, final int position) {
+        holder.imageView.setBackgroundResource(getBgRes());
+        
         Glide.with(holder.imageView.getContext())
             .load(imageUrls.get(position))
             .centerCrop()

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

@@ -16,10 +16,25 @@ import cc.winboll.studio.libappbase.LogUtils;
 public class ImagePagerAdapter extends PagerAdapter {
     public static final String TAG = "ImagePagerAdapter";
     private ArrayList<Uri> imageUrls;
+    private int bgType;
 
-    public ImagePagerAdapter(ArrayList<Uri> imageUrls) {
+    public ImagePagerAdapter(ArrayList<Uri> imageUrls, int bgType) {
         this.imageUrls = imageUrls;
-        LogUtils.d(TAG, "ImagePagerAdapter created with " + imageUrls.size() + " images");
+        this.bgType = bgType;
+        LogUtils.d(TAG, "ImagePagerAdapter created with " + imageUrls.size() + " images, bgType=" + bgType);
+    }
+    
+    private int getBgRes() {
+        switch (bgType) {
+            case 0:
+                return R.drawable.bg_checkerboard;
+            case 1:
+                return R.drawable.bg_white;
+            case 2:
+                return R.drawable.bg_black;
+            default:
+                return R.drawable.bg_checkerboard;
+        }
     }
 
     @Override
@@ -32,6 +47,7 @@ public class ImagePagerAdapter extends PagerAdapter {
     public Object instantiateItem(@NonNull ViewGroup container, int position) {
         View view = LayoutInflater.from(container.getContext())
             .inflate(R.layout.item_image_pager, container, false);
+        view.setBackgroundResource(getBgRes());
         ImageView imageView = view.findViewById(R.id.image);
         
         Glide.with(imageView.getContext())

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

@@ -32,8 +32,12 @@ public class ImageViewerActivity extends Activity implements ViewPager.OnPageCha
     private ImageButton btnBack;
     private ImageButton btnDelete;
     private ImageButton btnShare;
+    private ImageButton btnInfo;
+    private ImageButton btnBg;
+    private int bgType = 0;
     private GestureDetector gestureDetector;
     private TrashManager trashManager;
+    private Preferences prefs;
     
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -48,14 +52,20 @@ public class ImageViewerActivity extends Activity implements ViewPager.OnPageCha
         currentPosition = getIntent().getIntExtra(EXTRA_POSITION, 0);
         
         trashManager = new TrashManager(this);
+        prefs = new Preferences(this);
+        bgType = prefs.getBgType();
         
         viewPager = findViewById(R.id.view_pager);
         toolbar = findViewById(R.id.toolbar);
         btnBack = findViewById(R.id.btn_back);
         btnDelete = findViewById(R.id.btn_delete);
         btnShare = findViewById(R.id.btn_share);
+        btnInfo = findViewById(R.id.btn_info);
+        btnBg = findViewById(R.id.btn_bg);
         
-        ImagePagerAdapter adapter = new ImagePagerAdapter(imageUrls);
+        applyBg();
+        
+        ImagePagerAdapter adapter = new ImagePagerAdapter(imageUrls, bgType);
         viewPager.setAdapter(adapter);
         viewPager.setCurrentItem(currentPosition);
         viewPager.addOnPageChangeListener(this);
@@ -95,6 +105,20 @@ public class ImageViewerActivity extends Activity implements ViewPager.OnPageCha
                 shareCurrentImage();
             }
         });
+        
+        btnInfo.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                showImageInfo();
+            }
+        });
+        
+        btnBg.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                switchBg();
+            }
+        });
     }
     
     private void toggleToolbar() {
@@ -105,6 +129,52 @@ public class ImageViewerActivity extends Activity implements ViewPager.OnPageCha
         }
     }
     
+    private void applyBg() {
+        int bgRes;
+        switch (bgType) {
+            case 0:
+                bgRes = R.drawable.bg_checkerboard;
+                break;
+            case 1:
+                bgRes = R.drawable.bg_white;
+                break;
+            case 2:
+                bgRes = R.drawable.bg_black;
+                break;
+            default:
+                bgRes = R.drawable.bg_checkerboard;
+        }
+        View container = findViewById(R.id.container);
+        if (container != null) {
+            container.setBackgroundResource(bgRes);
+        }
+    }
+    
+    private void switchBg() {
+        final String[] bgNames = {"灰白相间", "全白", "全黑"};
+        final int[] bgResources = {R.drawable.bg_checkerboard, R.drawable.bg_white, R.drawable.bg_black};
+        
+        new AlertDialog.Builder(this)
+            .setTitle("选择背景")
+            .setSingleChoiceItems(bgNames, bgType, new android.content.DialogInterface.OnClickListener() {
+                @Override
+                public void onClick(android.content.DialogInterface dialog, int which) {
+                    bgType = which;
+                    prefs.setBgType(which);
+                    int currentItem = viewPager.getCurrentItem();
+                    View container = findViewById(R.id.container);
+                    if (container != null) {
+                        container.setBackgroundResource(bgResources[which]);
+                    }
+                    viewPager.setAdapter(new ImagePagerAdapter(imageUrls, bgType));
+                    viewPager.setCurrentItem(currentItem);
+                    dialog.dismiss();
+                }
+            })
+            .setNegativeButton("取消", null)
+            .show();
+    }
+    
     private void showDeleteDialog() {
         new AlertDialog.Builder(this)
             .setMessage("Delete to trash?")
@@ -169,7 +239,7 @@ public class ImageViewerActivity extends Activity implements ViewPager.OnPageCha
             if (currentPosition >= imageUrls.size()) {
                 currentPosition = imageUrls.size() - 1;
             }
-            viewPager.setAdapter(new ImagePagerAdapter(imageUrls));
+            viewPager.setAdapter(new ImagePagerAdapter(imageUrls, bgType));
             viewPager.setCurrentItem(currentPosition);
         }
     }
@@ -201,6 +271,155 @@ public class ImageViewerActivity extends Activity implements ViewPager.OnPageCha
         }
     }
     
+    private void showImageInfo() {
+        if (currentPosition < 0 || currentPosition >= imageUrls.size()) {
+            return;
+        }
+        
+        String imagePath = "";
+        if (imagePaths != null && currentPosition < imagePaths.size()) {
+            imagePath = imagePaths.get(currentPosition);
+        } else {
+            imagePath = getPathFromUri(imageUrls.get(currentPosition));
+        }
+        
+        File imageFile = new File(imagePath);
+        if (!imageFile.exists()) {
+            imageFile = new File(imagePath);
+        }
+        
+        android.widget.LinearLayout layout = new android.widget.LinearLayout(this);
+        layout.setOrientation(android.widget.LinearLayout.VERTICAL);
+        layout.setPadding(48, 32, 48, 32);
+        
+        android.widget.TextView labelPath = new android.widget.TextView(this);
+        labelPath.setText("Path:");
+        labelPath.setTextColor(getColor(android.R.color.darker_gray));
+        labelPath.setTextSize(14);
+        labelPath.setTypeface(null, android.graphics.Typeface.BOLD);
+        layout.addView(labelPath);
+        
+        android.widget.TextView valuePath = new android.widget.TextView(this);
+        valuePath.setText(imagePath);
+        valuePath.setTextColor(getColor(android.R.color.black));
+        valuePath.setTextSize(14);
+        valuePath.setTextIsSelectable(true);
+        layout.addView(valuePath);
+        
+        if (imageFile.exists()) {
+            long sizeBytes = imageFile.length();
+            String size;
+            if (sizeBytes < 1024) {
+                size = sizeBytes + " B";
+            } else if (sizeBytes < 1024 * 1024) {
+                size = String.format("%.2f KB", sizeBytes / 1024.0);
+            } else {
+                size = String.format("%.2f MB", sizeBytes / (1024.0 * 1024.0));
+            }
+            
+            android.widget.TextView labelSize = new android.widget.TextView(this);
+            labelSize.setText("Size:");
+            labelSize.setTextColor(getColor(android.R.color.darker_gray));
+            labelSize.setTextSize(14);
+            labelSize.setTypeface(null, android.graphics.Typeface.BOLD);
+            layout.addView(labelSize);
+            
+            android.widget.TextView valueSize = new android.widget.TextView(this);
+            valueSize.setText(size);
+            valueSize.setTextColor(getColor(android.R.color.black));
+            valueSize.setTextSize(14);
+            valueSize.setTextIsSelectable(true);
+            layout.addView(valueSize);
+        }
+        
+        try {
+            android.graphics.BitmapFactory.Options options = new android.graphics.BitmapFactory.Options();
+            options.inJustDecodeBounds = true;
+            android.graphics.BitmapFactory.decodeFile(imagePath, options);
+            if (options.outWidth > 0 && options.outHeight > 0) {
+                android.widget.TextView labelPixels = new android.widget.TextView(this);
+                labelPixels.setText("Pixels:");
+                labelPixels.setTextColor(getColor(android.R.color.darker_gray));
+                labelPixels.setTextSize(14);
+                labelPixels.setTypeface(null, android.graphics.Typeface.BOLD);
+                layout.addView(labelPixels);
+                
+                android.widget.TextView valuePixels = new android.widget.TextView(this);
+                valuePixels.setText(options.outWidth + " x " + options.outHeight);
+                valuePixels.setTextColor(getColor(android.R.color.black));
+                valuePixels.setTextSize(14);
+                valuePixels.setTextIsSelectable(true);
+                layout.addView(valuePixels);
+            }
+        } catch (Exception e) {
+            LogUtils.e(TAG, "get pixels error: " + e.getMessage());
+        }
+        
+        try {
+            String[] projection = {
+                MediaStore.Images.Media.DATE_ADDED,
+                MediaStore.Images.Media.DATE_MODIFIED,
+                MediaStore.Images.Media.DATE_TAKEN
+            };
+            android.database.Cursor cursor = getContentResolver().query(
+                imageUrls.get(currentPosition), projection, null, null, null);
+            if (cursor != null) {
+                if (cursor.moveToFirst()) {
+                    int dateAddedCol = cursor.getColumnIndex(MediaStore.Images.Media.DATE_ADDED);
+                    int dateTakenCol = cursor.getColumnIndex(MediaStore.Images.Media.DATE_TAKEN);
+                    
+                    java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+                    
+                    if (dateTakenCol >= 0) {
+                        long dateTaken = cursor.getLong(dateTakenCol);
+                        if (dateTaken > 0) {
+                            android.widget.TextView labelTaken = new android.widget.TextView(this);
+                            labelTaken.setText("Date Taken:");
+                            labelTaken.setTextColor(getColor(android.R.color.darker_gray));
+                            labelTaken.setTextSize(14);
+                            labelTaken.setTypeface(null, android.graphics.Typeface.BOLD);
+                            layout.addView(labelTaken);
+                            
+                            android.widget.TextView valueTaken = new android.widget.TextView(this);
+                            valueTaken.setText(sdf.format(new java.util.Date(dateTaken)));
+                            valueTaken.setTextColor(getColor(android.R.color.black));
+                            valueTaken.setTextSize(14);
+                            valueTaken.setTextIsSelectable(true);
+                            layout.addView(valueTaken);
+                        }
+                    }
+                    if (dateAddedCol >= 0) {
+                        long dateAdded = cursor.getLong(dateAddedCol);
+                        if (dateAdded > 0) {
+                            android.widget.TextView labelAdded = new android.widget.TextView(this);
+                            labelAdded.setText("Date Added:");
+                            labelAdded.setTextColor(getColor(android.R.color.darker_gray));
+                            labelAdded.setTextSize(14);
+                            labelAdded.setTypeface(null, android.graphics.Typeface.BOLD);
+                            layout.addView(labelAdded);
+                            
+                            android.widget.TextView valueAdded = new android.widget.TextView(this);
+                            valueAdded.setText(sdf.format(new java.util.Date(dateAdded * 1000)));
+                            valueAdded.setTextColor(getColor(android.R.color.black));
+                            valueAdded.setTextSize(14);
+                            valueAdded.setTextIsSelectable(true);
+                            layout.addView(valueAdded);
+                        }
+                    }
+                }
+                cursor.close();
+            }
+        } catch (Exception e) {
+            LogUtils.e(TAG, "get date error: " + e.getMessage());
+        }
+        
+        new AlertDialog.Builder(this)
+            .setTitle("Image Info")
+            .setView(layout)
+            .setPositiveButton("OK", null)
+            .show();
+    }
+    
     @Override
     public void onPageSelected(int position) {
         currentPosition = position;

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

@@ -52,6 +52,7 @@ public class MainActivity extends AppCompatActivity {
         recyclerView = findViewById(R.id.recycler_view);
         recyclerView.setLayoutManager(new GridLayoutManager(this, 2));
         adapter = new AlbumAdapter();
+        adapter.setContext(this);
         recyclerView.setAdapter(adapter);
         
         adapter.setOnAlbumClickListener(new OnAlbumClickListener() {
@@ -138,9 +139,9 @@ public class MainActivity extends AppCompatActivity {
         LogUtils.d(TAG, "baseFolder: " + baseFolder.getAbsolutePath() + ", exists=" + baseFolder.exists());
         
         if (!baseFolder.exists() || !baseFolder.isDirectory()) {
-            folderPath = Environment.getExternalStorageDirectory() + "/DCIM";
+            folderPath = Preferences.getDefaultPath();
             baseFolder = new File(folderPath);
-            LogUtils.d(TAG, "try DCIM: " + baseFolder.getAbsolutePath() + ", exists=" + baseFolder.exists());
+            LogUtils.d(TAG, "try default: " + baseFolder.getAbsolutePath() + ", exists=" + baseFolder.exists());
             if (!baseFolder.exists()) {
                 folderPath = Environment.getExternalStorageDirectory() + "/Pictures";
                 baseFolder = new File(folderPath);
@@ -244,6 +245,9 @@ public class MainActivity extends AppCompatActivity {
             scanMediaStore();
             loadAlbums();
         }
+        if (adapter != null) {
+            adapter.refreshBg();
+        }
     }
     
     private void scanMediaStore() {

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

@@ -8,7 +8,9 @@ public class Preferences {
     public static final String TAG = "Preferences";
     private static final String PREF_NAME = "gallery_prefs";
     private static final String KEY_FOLDER_PATH = "folder_path";
-    private static final String DEFAULT_PATH = "/storage/emulated/0/DCIM";
+    private static final String KEY_BG_TYPE = "bg_type";
+    private static final int DEFAULT_BG_TYPE = 0;
+    private static final String DEFAULT_PATH = "/storage/emulated/0/Pictures/Gallery/owner";
     
     public static String getDefaultPath() {
         return DEFAULT_PATH;
@@ -30,4 +32,13 @@ public class Preferences {
         LogUtils.d(TAG, "setFolderPath: " + path);
         prefs.edit().putString(KEY_FOLDER_PATH, path).apply();
     }
+    
+    public int getBgType() {
+        return prefs.getInt(KEY_BG_TYPE, DEFAULT_BG_TYPE);
+    }
+    
+    public void setBgType(int type) {
+        LogUtils.d(TAG, "setBgType: " + type);
+        prefs.edit().putInt(KEY_BG_TYPE, type).apply();
+    }
 }

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

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <solid android:color="#000000"/>
+</shape>

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

@@ -0,0 +1,30 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="10dp"
+    android:height="10dp"
+    android:viewportWidth="10"
+    android:viewportHeight="10">
+    <path
+        android:fillColor="#808080"
+        android:pathData="M0,0h1v1h-1z M2,0h1v1h-1z M4,0h1v1h-1z M6,0h1v1h-1z M8,0h1v1h-1z
+                             M1,1h1v1h-1z M3,1h1v1h-1z M5,1h1v1h-1z M7,1h1v1h-1z M9,1h1v1h-1z
+                             M0,2h1v1h-1z M2,2h1v1h-1z M4,2h1v1h-1z M6,2h1v1h-1z M8,2h1v1h-1z
+                             M1,3h1v1h-1z M3,3h1v1h-1z M5,3h1v1h-1z M7,3h1v1h-1z M9,3h1v1h-1z
+                             M0,4h1v1h-1z M2,4h1v1h-1z M4,4h1v1h-1z M6,4h1v1h-1z M8,4h1v1h-1z
+                             M1,5h1v1h-1z M3,5h1v1h-1z M5,5h1v1h-1z M7,5h1v1h-1z M9,5h1v1h-1z
+                             M0,6h1v1h-1z M2,6h1v1h-1z M4,6h1v1h-1z M6,6h1v1h-1z M8,6h1v1h-1z
+                             M1,7h1v1h-1z M3,7h1v1h-1z M5,7h1v1h-1z M7,7h1v1h-1z M9,7h1v1h-1z
+                             M0,8h1v1h-1z M2,8h1v1h-1z M4,8h1v1h-1z M6,8h1v1h-1z M8,8h1v1h-1z
+                             M1,9h1v1h-1z M3,9h1v1h-1z M5,9h1v1h-1z M7,9h1v1h-1z M9,9h1v1h-1z"/>
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M1,0h1v1h-1z M3,0h1v1h-1z M5,0h1v1h-1z M7,0h1v1h-1z M9,0h1v1h-1z
+                             M0,1h1v1h-1z M2,1h1v1h-1z M4,1h1v1h-1z M6,1h1v1h-1z M8,1h1v1h-1z
+                             M1,2h1v1h-1z M3,2h1v1h-1z M5,2h1v1h-1z M7,2h1v1h-1z M9,2h1v1h-1z
+                             M0,3h1v1h-1z M2,3h1v1h-1z M4,3h1v1h-1z M6,3h1v1h-1z M8,3h1v1h-1z
+                             M1,4h1v1h-1z M3,4h1v1h-1z M5,4h1v1h-1z M7,4h1v1h-1z M9,4h1v1h-1z
+                             M0,5h1v1h-1z M2,5h1v1h-1z M4,5h1v1h-1z M6,5h1v1h-1z M8,5h1v1h-1z
+                             M1,6h1v1h-1z M3,6h1v1h-1z M5,6h1v1h-1z M7,6h1v1h-1z M9,6h1v1h-1z
+                             M0,7h1v1h-1z M2,7h1v1h-1z M4,7h1v1h-1z M6,7h1v1h-1z M8,7h1v1h-1z
+                             M1,8h1v1h-1z M3,8h1v1h-1z M5,8h1v1h-1z M7,8h1v1h-1z M9,8h1v1h-1z
+                             M0,9h1v1h-1z M2,9h1v1h-1z M4,9h1v1h-1z M6,9h1v1h-1z M8,9h1v1h-1z"/>
+</vector>

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

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <solid android:color="#FFFFFF"/>
+</shape>

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

@@ -0,0 +1,12 @@
+<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="M4,4h7v7h-7z M13,4h7v7h-7z M4,13h7v7h-7z M13,13h7v7h-7z"/>
+    <path
+        android:fillColor="#808080"
+        android:pathData="M11,4h2v7h-2z M4,11h7v2h-7z M13,11h7v2h-7z M11,13h2v7h-2z M13,4h2v7h-2z M4,13h7v2h-7z"/>
+</vector>

gallery/src/main/res/drawable/ic_info.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="M12,2C6.48,2 2,6.48 2,12s4.48,10 10,10 10,-4.48 10,-10S17.52,2 12,2zM13,17h-2v-6h2v6zM13,9h-2L11,7h2v2z"/>
+</vector>

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

@@ -44,6 +44,22 @@
             android:src="@drawable/ic_share"
             android:contentDescription="Share"/>
 
+        <ImageButton
+            android:id="@+id/btn_info"
+            android:layout_width="48dp"
+            android:layout_height="48dp"
+            android:background="?attr/selectableItemBackgroundBorderless"
+            android:src="@drawable/ic_info"
+            android:contentDescription="Info"/>
+
+        <ImageButton
+            android:id="@+id/btn_bg"
+            android:layout_width="48dp"
+            android:layout_height="48dp"
+            android:background="?attr/selectableItemBackgroundBorderless"
+            android:src="@drawable/ic_bg"
+            android:contentDescription="Background"/>
+
         <ImageButton
             android:id="@+id/btn_delete"
             android:layout_width="48dp"

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

@@ -2,8 +2,7 @@
 <FrameLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:background="@color/black">
+    android:layout_height="match_parent">
 
     <ImageView
         android:id="@+id/image"