Merge "Cache Scene objects by layout ID on the scene root" into klp-dev

    private ViewGroup mSceneRoot;

    private ViewGroup mLayout; // alternative to layoutId

    Runnable mEnterAction, mExitAction;

    private static ThreadLocal<SparseArray<Scene>> sScenes = new ThreadLocal<SparseArray<Scene>>();

    /**

     * Returns a Scene described by the resource file associated with the given

     * <code>layoutId</code> parameter. If such a Scene has already been created,

     * that same Scene will be returned. This caching of layoutId-based scenes enables

     * sharing of common scenes between those created in code and those referenced

     * by {@link TransitionManager} XML resource files.

     * <code>layoutId</code> parameter. If such a Scene has already been created for

     * the given <code>sceneRoot</code>, that same Scene will be returned.

     * This caching of layoutId-based scenes enables sharing of common scenes

     * between those created in code and those referenced by {@link TransitionManager}

     * XML resource files.

     *

     * @param sceneRoot The root of the hierarchy in which scene changes

     * and transitions will take place.

     * @param layoutId The id of a standard layout resource file.

     * @param context The context used in the process of inflating

     * the layout resource.

     * @return

     * @return The scene for the given root and layout id

     */

    public static Scene getSceneForLayout(ViewGroup sceneRoot, int layoutId, Context context) {

        SparseArray<Scene> scenes = sScenes.get();

        SparseArray<Scene> scenes = (SparseArray<Scene>) sceneRoot.getTag(

                com.android.internal.R.id.scene_layoutid_cache);

        if (scenes == null) {

            scenes = new SparseArray<Scene>();

            sScenes.set(scenes);

            sceneRoot.setTag(com.android.internal.R.id.scene_layoutid_cache, scenes);

        }

        Scene scene = scenes.get(layoutId);

        if (scene != null) {

  <item type="id" name="popup_submenu_presenter" />

  <item type="id" name="action_bar_spinner" />

  <item type="id" name="current_scene" />

  <item type="id" name="scene_layoutid_cache" />

</resources>

  <java-symbol type="id" name="clearDefaultHint" />

  <java-symbol type="id" name="contentPanel" />

  <java-symbol type="id" name="current_scene" />

  <java-symbol type="id" name="scene_layoutid_cache" />

  <java-symbol type="id" name="customPanel" />

  <java-symbol type="id" name="datePicker" />

  <java-symbol type="id" name="day" />