Question

几个月前我厌倦了但是失败了我试图做的是计算用户解锁手机并在屏幕上显示的次数，但每次解锁手机时我都会收到模糊的数字。
我的代码如下 我的主要活动是创建

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    startService(new Intent(getApplicationContext(), LockService.class));
    TextView ticker;
    ticker = (TextView) findViewById(R.id.textView);
    ticker.setText(String.valueOf(Tick.tick));
    Log.e("but this is awesome ", String.valueOf(Tick.tick));
}

服务类

public class LockService extends Service {
@Override
public IBinder onBind(Intent intent) {
    return null;
}

@Override
public void onCreate() {
    super.onCreate();
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    final IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
    filter.addAction(Intent.ACTION_SCREEN_OFF);
    filter.addAction(Intent.ACTION_USER_PRESENT);
    final BroadcastReceiver mReceiver = new ScreenReceiver();
    registerReceiver(mReceiver, filter);
    return super.onStartCommand(intent, flags, startId);
}
public class LocalBinder extends Binder {
    LockService getService() {
        return LockService.this;
    }
}

} BroadcastReceiver类

public class ScreenReceiver extends BroadcastReceiver {
public static boolean wasScreenOn = true;


    @Override
    public void onReceive(final Context context, final Intent intent) {
        Log.e("test", "onReceive");
        if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
            wasScreenOn = false;
            Log.e("test", "wasScreenOn" + wasScreenOn);
        } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
            wasScreenOn = true;
            Log.e("test", "wasScreenOn and user present" + wasScreenOn);
        } else if (intent.getAction().equals(Intent.ACTION_USER_PRESENT)) {
            Tick.tick ++;
            Log.e("test", "userpresent" + Tick.tick);
        }
    }

}

请帮助我了解我做错了什么

Answer 1

我相信发生的事情是这样的：每次打开活动时，都会调用启动服务。因此，即使您的服务已在运行，也会调用onStartCommand。这样，您多次注册广播，然后当您解锁设备时，每次重新注册时计数器都会递增。您应该执行以下选项之一： 1.在清单中定义接收方，这样您每次都不必处理注册和取消注册。 2.在服务中注册接收者onCreate而不是onStartCommand。另外，请确保在服务onDestroy中取消注册它们。

试图计算手机解锁的次数

1 个答案: