Fix film init

libs/rs/java/Film/src/com/android/film/FilmView.java

@@ -42,19 +42,29 @@ public class FilmView extends RSSurfaceView {
 
     public FilmView(Context context) {
         super(context);
-
         //setFocusable(true);
     }
 
     private RenderScript mRS;
     private FilmRS mRender;
 
+
     public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
         super.surfaceChanged(holder, format, w, h);
+        if (mRS == null) {
+            mRS = createRenderScript(false);
+            mRS.contextSetSurface(w, h, holder.getSurface());
+            mRender = new FilmRS();
+            mRender.init(mRS, getResources(), w, h);
+        }
+    }
 
-        mRS = createRenderScript(true);
-        mRender = new FilmRS();
-        mRender.init(mRS, getResources(), w, h);
+    @Override
+    protected void onDetachedFromWindow() {
+        if(mRS != null) {
+            mRS = null;
+            destroyRenderScript();
+        }
     }
 
     @Override