Android 11.0 在闹钟APK，长按进入夜间模式，松开退出夜间模式

路径：packages/apps/DeskClock/src/com/android/deskclock/ScreensaverActivity.java

设置长按事件

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ...
        final Intent intent = getIntent();
        if (intent != null) {
            final int eventLabel = intent.getIntExtra(Events.EXTRA_EVENT_LABEL, 0);
            Events.sendScreensaverEvent(R.string.action_show, eventLabel);
        }
++        mContentView.setOnLongClickListener(new ScreensaverActivity.StopScreenSaverListener());
        ...
    }

新增：长按监听事件，长按销毁屏幕保护

++    private final class StopScreenSaverListener implements View.OnLongClickListener {
++        @Override
++        public boolean onLongClick(View view) {
++            finish();
++            return true;
++        }
++    }

松手不销毁屏幕保护

@Override
    public void onUserInteraction() {
        // We want the screen saver to exit upon user interaction.
++ //        finish();
    }