Launcher.java 文件源码

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

    mWorkspace.removeCallbacks(mBuildLayersRunnable);
    mWorkspace.removeFolderListeners();

    // Stop callbacks from LauncherModel
    // It's possible to receive onDestroy after a new Launcher activity has
    // been created. In this case, don't interfere with the new Launcher.
    if (mModel.isCurrentCallbacks(this)) {
        mModel.stopLoader();
        LauncherAppState.getInstance(this).setLauncher(null);
    }

    if (mRotationPrefChangeHandler != null) {
        mSharedPrefs.unregisterOnSharedPreferenceChangeListener(mRotationPrefChangeHandler);
    }

    try {
        mAppWidgetHost.stopListening();
    } catch (NullPointerException ex) {
        ex.printStackTrace();
    }
    mAppWidgetHost = null;

    TextKeyListener.getInstance().release();

    ((AccessibilityManager) getSystemService(ACCESSIBILITY_SERVICE))
            .removeAccessibilityStateChangeListener(this);

    LauncherAnimUtils.onDestroyActivity();

    if (mLauncherCallbacks != null) {
        mLauncherCallbacks.onDestroy();
    }
}