Reuse existing temporary wallpaper tiles when selecting same photo.

Previously, if you selected a photo to set as the wallpaper multiple times, it
kept adding temporary wallpaper tiles that were all identical. Now it reuses the
same tile, updating the thumbnail and wallpaper if the Uri happens to point to a
new image (such as if a photo is renamed).

Change-Id: Ib05c9db4e1fd17226b503174f25add3368158b11
(cherry picked from commit f970ee5cdc0185fa5003ded178ef680813d8a259)

diff --git a/WallpaperPicker/src/com/android/launcher3/WallpaperPickerActivity.java b/WallpaperPicker/src/com/android/launcher3/WallpaperPickerActivity.java
index 5985850..b957754 100644 (file)
--- a/WallpaperPicker/src/com/android/launcher3/WallpaperPickerActivity.java
+++ b/WallpaperPicker/src/com/android/launcher3/WallpaperPickerActivity.java
@@ -842,12 +842,31 @@ public class WallpaperPickerActivity extends WallpaperCropActivity {
     }
 
     private void addTemporaryWallpaperTile(final Uri uri, boolean fromRestore) {
-        mTempWallpaperTiles.add(uri);
-        // Add a tile for the image picked from Gallery
-        final FrameLayout pickedImageThumbnail = (FrameLayout) getLayoutInflater().
-                inflate(R.layout.wallpaper_picker_item, mWallpapersView, false);
-        pickedImageThumbnail.setVisibility(View.GONE);
-        mWallpapersView.addView(pickedImageThumbnail, 0);
+        // Add a tile for the image picked from Gallery, reusing the existing tile if there is one.
+        FrameLayout existingImageThumbnail = null;
+        int indexOfExistingTile = 0;
+        for (; indexOfExistingTile < mWallpapersView.getChildCount(); indexOfExistingTile++) {
+            FrameLayout thumbnail = (FrameLayout) mWallpapersView.getChildAt(indexOfExistingTile);
+            Object tag = thumbNail.getTag();
+            if (tag instanceof UriWallpaperInfo && ((UriWallpaperInfo) tag).mUri.equals(uri)) {
+                existingImageThumbnail = thumbNail;
+                break;
+            }
+        }
+        final FrameLayout pickedImageThumbnail;
+        if (existingImageThumbnail != null) {
+            pickedImageThumbnail = existingImageThumbnail;
+            // Always move the existing wallpaper to the front so user can see it without scrolling.
+            mWallpapersView.removeViewAt(indexOfExistingTile);
+            mWallpapersView.addView(existingImageThumbnail, 0);
+        } else {
+            // This is the first time this temporary wallpaper has been added
+            pickedImageThumbnail = (FrameLayout) getLayoutInflater()
+                    .inflate(R.layout.wallpaper_picker_item, mWallpapersView, false);
+            pickedImageThumbnail.setVisibility(View.GONE);
+            mWallpapersView.addView(pickedImageThumbnail, 0);
+            mTempWallpaperTiles.add(uri);
+        }
 
         // Load the thumbnail
         final ImageView image = (ImageView) pickedImageThumbnail.findViewById(R.id.wallpaper_image);
@@ -857,7 +876,8 @@ public class WallpaperPickerActivity extends WallpaperCropActivity {
             protected Bitmap doInBackground(Void...args) {
                 try {
                     int rotation = BitmapUtils.getRotationFromExif(context, uri);
-                    return createThumbnail(defaultSize, context, uri, null, null, 0, rotation, false);
+                    return createThumbnail(defaultSize, context, uri, null, null, 0, rotation,
+                            false);
                 } catch (SecurityException securityException) {
                     if (isActivityDestroyed()) {
                         // Temporarily granted permissions are revoked when the activity