android2.3 system native Gallery3D of the source code, it is not the same as ordinary application, it does not use the android UI system, but drawn with opengl. Read this source may be more in-depth understanding of opengl and android interface

Gallery3D\src\com\cooliris\cache\CacheService.java
.........\...\...\........\.....\ImageList.java
.........\...\...\........\.....\BootReceiver.java
.........\...\...\........\app\App.java
.........\...\...\........\...\Res.java
.........\...\...\........\picasa\PhotoEntry.java
.........\...\...\........\......\UserEntry.java
.........\...\...\........\......\AlbumEntry.java
.........\...\...\........\......\PicasaReceiver.java
.........\...\...\........\......\GDataParser.java
.........\...\...\........\......\PicasaSyncAdapter.java
.........\...\...\........\......\EntrySchema.java
.........\...\...\........\......\GDataClient.java
.........\...\...\........\......\PicasaApi.java
.........\...\...\........\......\PicasaContentProvider.java
.........\...\...\........\......\TableContentProvider.java
.........\...\...\........\......\Entry.java
.........\...\...\........\......\PicasaService.java
.........\...\...\........\wallpaper\RandomDataSource.java
.........\...\...\........\.........\Slideshow.java
.........\...\...\........\media\Photographs.java
.........\...\...\........\.....\DirectLinkedList.java
.........\...\...\........\.....\TimeBar.java
.........\...\...\........\.....\LocationMediaFilter.java
.........\...\...\........\.....\Utils.java
.........\...\...\........\.....\DiskCacheStorage.java
.........\...\...\........\.....\MediaFeed.java
.........\...\...\........\.....\PhotoAppWidgetConfigure.java
.........\...\...\........\.....\Wallpaper.java
.........\...\...\........\.....\BackgroundLayer.java
.........\...\...\........\.....\Vector3f.java
.........\...\...\........\.....\Util.java
.........\...\...\........\.....\IndexRange.java
.........\...\...\........\.....\GridQuad.java
.........\...\...\........\.....\Cancelable.java
.........\...\...\........\.....\MediaItemTexture.java
.........\...\...\........\.....\Shared.java
.........\...\...\........\.....\DisplaySlot.java
.........\...\...\........\.....\GridCamera.java
.........\...\...\........\.....\MediaBucketList.java
.........\...\...\........\.....\FloatAnim.java
.........\...\...\........\.....\BitmapTexture.java
.........\...\...\........\.....\DetailMode.java
.........\...\...\........\.....\ActiveWallpaper.java
.........\...\...\........\.....\RotateBitmap.java
.........\...\...\........\.....\MonitoredActivity.java
.........\...\...\........\.....\ImageManager.java
.........\...\...\........\.....\VirtualFeed.java
.........\...\...\........\.....\MediaSet.java
.........\...\...\........\.....\LongSparseArray.java
.........\...\...\........\.....\MediaBucket.java
.........\...\...\........\.....\PathBarLayer.java
.........\...\...\........\.....\LocalDataSource.java
.........\...\...\........\.....\HighlightView.java
.........\...\...\........\.....\MediaClustering.java
.........\...\...\........\.....\Layer.java
.........\...\...\........\.....\RootLayer.java
.........\...\...\........\.....\IconTitleDrawable.java
.........\...\...\........\.....\GridDrawManager.java
.........\...\...\........\.....\CanvasTexture.java
.........\...\...\........\.....\GridLayoutInterface.java
.........\...\...\........\.....\StringTexture.java
.........\...\...\........\.....\ReverseGeocoder.java
.........\...\...\........\.....\Gallery.java
.........\...\...\........\.....\MatrixStack.java
.........\...\...\........\.....\DisplayItem.java
.........\...\...\........\.....\UriTexture.java
.........\...\...\........\.....\BaseCancelable.java
.........\...\...\........\.....\ImageButton.java
.........\...\...\........\.....\Deque.java
.........\...\...\........\.....\ArrayUtils.java
.........\...\...\........\.....\Pair.java
.........\...\...\........\.....\MediaItem.java
.........\...\...\........\.....\HudLayer.java
.........\...\...\........\.....\PhotoAppWidgetProvider.java
.........\...\...\........\.....\DiskCache.java
.........\...\...\........\.....\SimpleStringTexture.java
.........\...\...\........\.....\GridLayer.java
.........\...\...\........\.....\GridInputProcessor.java
.........\...\...\........\.....\ImageViewTouchBase.java
.........\...

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