xamarin - 按下电源按钮后振动器不振动？

Question

我有一个调用振动器的服务。

[Service]
public class MyService : Service
{
    System.Threading.Timer timer;

    public MyService()
    {
    }

    public override StartCommandResult OnStartCommand(Intent intent, StartCommandFlags flags, int startId)
    {

        timer = new System.Threading.Timer( getCurrentPendingObjects, null, 100, Timeout.Infinite );

        return StartCommandResult.Sticky;
    }

    public override bool OnUnbind( Intent intent )
    {
        return base.OnUnbind( intent );
    }

    public override IBinder OnBind(Intent intent)
    {           
        binder = new MyServiceBinder( this );

        return binder;
    }   

    private void getCurrentPendingObjects( Object state )
    {
        Vibrator vibrator = (Vibrator)context.GetSystemService( Context.VibratorService );

        long [] vibrationPatern = new long[ ] { 100, 170 };
         vibrator.Vibrate( vibrationPatern, 1 );
    }
}

一切正常，直到我按下电源按钮导致屏幕关闭，设备进入休眠模式。服务似乎继续工作，但振动器停止振动。

• 如何在设备进入休眠模式的情况下保持振动器振动？

Answer 1

唤醒锁 将使系统保持事件状态，例如:

PowerManager powerManager = (PowerManager)Application.Context.GetSystemService(Application.PowerService);
Android.OS.PowerManager.WakeLock wakeLock = powerManager.NewWakeLock(WakeLockFlags.Partial, "StackOverFlow");
wakeLock.Acquire();

注意:完成后，请释放锁定，因为这会降低电池生命周期:

wakeLock.Release();

注意: list 所需的权限

<uses-permission android:name="android.permission.WAKE_LOCK" />

安卓文档:https://developer.android.com/reference/android/os/PowerManager.html