如何显示屏幕被锁定？

Question

在我的应用程序中,我需要知道设备何时被锁定(在HTC上它看起来像是短按"电源"按钮).所以问题是:当设备被锁定时会触发哪个事件？或设备要睡觉？

Answer 1

您应该扩展BroadcastReceiver和实现onReceive,如下所示:

public class YourBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        if (Intent.ACTION_SCREEN_OFF.equalsIgnoreCase(intent.getAction())) {
            //screen has been switched off!
        }
    }
}

然后你只需要注册它,你将在屏幕关闭时开始接收事件:

IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);
appBroadcastReceiver = new AppBroadcastReceiver(yourActivity);
registerReceiver(appBroadcastReceiver, filter);