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
    LauncherAppState app = (LauncherAppState.getInstance());
    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();

    // Disconnect any of the callbacks and drawables associated with
    // ItemInfos on the workspace
    // to prevent leaking Launcher activities on orientation change.
    if (mModel != null) {
        mModel.unbindItemInfosAndClearQueuedBindRunnables();
    }

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

    mDragLayer.clearAllResizeFrames();
    ((ViewGroup) mWorkspace.getParent()).removeAllViews();
    mWorkspace.removeAllWorkspaceScreens();
    mWorkspace = null;
    mDragController = null;

    LauncherAnimUtils.onDestroyActivity();

    unregisterReceiver(protectedAppsChangedReceiver);
}