Add static preview images to gesture settings.

Set the animation preview image view to the newly added preview image
instead of loading it from animation video.

Test: manual - launch gesture settings and visually check the animation
preview images.

Bug: 31636637

Change-Id: If25a0e3501bea0c6343326a143d665ec79e3d7c7

src/com/android/settings/gestures/GesturePreference.java

@@ -14,18 +14,12 @@
 
 package com.android.settings.gestures;
 
-import android.app.LoaderManager;
 import android.content.ContentResolver;
 import android.content.Context;
-import android.content.Loader;
 import android.content.res.TypedArray;
-import android.graphics.Bitmap;
-import android.graphics.drawable.BitmapDrawable;
 import android.graphics.SurfaceTexture;
-import android.media.MediaMetadataRetriever;
 import android.media.MediaPlayer;
 import android.net.Uri;
-import android.os.Bundle;
 import android.support.v14.preference.SwitchPreference;
 import android.support.v7.preference.PreferenceViewHolder;
 import android.view.View;
@@ -36,15 +30,13 @@ import android.util.AttributeSet;
 import android.util.Log;
 
 import com.android.settings.R;
-import com.android.settings.utils.AsyncLoader;
 
 /**
  * Preference item for a gesture with a switch to signify if it should be enabled.
  * This shows the title and description of the gesture along with an animation showing how to do
  * the gesture
  */
-public final class GesturePreference extends SwitchPreference implements
-        LoaderManager.LoaderCallbacks<Bitmap> {
+public final class GesturePreference extends SwitchPreference {
     private static final String TAG = "GesturePreference";
     private final Context mContext;
 
@@ -53,7 +45,7 @@ public final class GesturePreference extends SwitchPreference implements
     private boolean mAnimationAvailable;
     private boolean mVideoReady;
     private boolean mScrolling;
-    private BitmapDrawable mPreviewImage;
+    private int mPreviewResource;
 
     public GesturePreference(Context context, AttributeSet attrs) {
         super(context, attrs);
@@ -71,6 +63,10 @@ public final class GesturePreference extends SwitchPreference implements
             mMediaPlayer = MediaPlayer.create(mContext, mVideoPath);
             if (mMediaPlayer != null && mMediaPlayer.getDuration() > 0) {
                 setLayoutResource(R.layout.gesture_preference);
+
+                mPreviewResource = attributes.getResourceId(
+                        R.styleable.GesturePreference_preview, 0);
+
                 mMediaPlayer.setOnSeekCompleteListener(new MediaPlayer.OnSeekCompleteListener() {
                     @Override
                     public void onSeekComplete(MediaPlayer mp) {
@@ -103,6 +99,7 @@ public final class GesturePreference extends SwitchPreference implements
 
         final TextureView video = (TextureView) holder.findViewById(R.id.gesture_video);
         final ImageView imageView = (ImageView) holder.findViewById(R.id.gesture_image);
+        imageView.setImageResource(mPreviewResource);
         final ImageView playButton = (ImageView) holder.findViewById(R.id.gesture_play_button);
 
         video.setOnClickListener(new View.OnClickListener() {
@@ -138,9 +135,6 @@ public final class GesturePreference extends SwitchPreference implements
 
             @Override
             public boolean onSurfaceTextureDestroyed(SurfaceTexture surfaceTexture) {
-                if (mPreviewImage != null && imageView.getDrawable() == null) {
-                    imageView.setImageDrawable(mPreviewImage);
-                }
                 imageView.setVisibility(View.VISIBLE);
                 return false;
             }
@@ -159,10 +153,6 @@ public final class GesturePreference extends SwitchPreference implements
             }
         });
 
-        if (mPreviewImage != null) {
-            imageView.setImageDrawable(mPreviewImage);
-        }
-
     }
 
     @Override
@@ -179,63 +169,10 @@ public final class GesturePreference extends SwitchPreference implements
         mScrolling = scrolling;
     }
 
-    void loadPreview(LoaderManager manager, int id) {
-        if (mAnimationAvailable) {
-            Loader<Bitmap> loader = manager.initLoader(id, Bundle.EMPTY, this);
-        }
-    }
-
     void onViewVisible() {
         if (mVideoReady && mMediaPlayer != null && !mMediaPlayer.isPlaying()) {
             mMediaPlayer.seekTo(0);
         }
     }
 
-    private static final class PreviewRetriever extends AsyncLoader<Bitmap> {
-        private Uri mVideoPath;
-
-        public PreviewRetriever(Context context, Uri videoPath) {
-            super(context);
-            mVideoPath = videoPath;
-        }
-
-        @Override
-        public Bitmap loadInBackground() {
-            MediaMetadataRetriever mediaMetadata = new MediaMetadataRetriever();
-            try {
-                mediaMetadata.setDataSource(getContext(), mVideoPath);
-                return mediaMetadata.getFrameAtTime(0);
-            } catch (Exception e) {
-                Log.w(TAG, "Unable to get animation preview.");
-            } finally {
-                mediaMetadata.release();
-            }
-            return null;
-        }
-
-        @Override
-        public void onDiscardResult(final Bitmap result) {
-            if (result != null && !result.isRecycled()) {
-                result.recycle();
-            }
-        }
-
-    }
-
-    @Override
-    public Loader<Bitmap> onCreateLoader(int id, Bundle args) {
-        return new PreviewRetriever(mContext, mVideoPath);
-    }
-
-    @Override
-    public void onLoadFinished(final Loader<Bitmap> loader, final Bitmap bitmap) {
-        if (bitmap != null) {
-            mPreviewImage = new BitmapDrawable(mContext.getResources(), bitmap);
-        }
-    }
-
-    @Override
-    public void onLoaderReset(Loader<Bitmap> loader) {
-    }
-
 }