Launcher.java 文件源码

@Override
public void onDestroy() {
    super.onDestroy();

    // Remove all pending runnables
    mHandler.removeMessages(ADVANCE_MSG);
    mHandler.removeMessages(0);
    mWorkspace.removeCallbacks(mBuildLayersRunnable);

    // Stop callbacks from LauncherModel
    LauncherApplication app = ((LauncherApplication) getApplication());
    mModel.stopLoader();
    app.setLauncher(null);

    try {
        mAppWidgetHost.stopListening();
    } catch (NullPointerException ex) {
        Log.w(TAG, "problem while stopping AppWidgetHost during Launcher destruction", ex);
    }
    mAppWidgetHost = null;

    mWidgetsToAdvance.clear();

    TextKeyListener.getInstance().release();


    unbindWorkspaceAndHotseatItems();

    getContentResolver().unregisterContentObserver(mWidgetObserver);
    unregisterReceiver(mCloseSystemDialogsReceiver);

    ((ViewGroup) mWorkspace.getParent()).removeAllViews();
    mWorkspace.removeAllViews();
    mWorkspace = null;
    mDragController = null;

    ValueAnimator.clearAllAnimations();
}