Question

我必须每120秒发送一次GPS（Lat / Lon）服务。到我的REST后端。

我遇到的问题是，当屏幕关闭时，服务似乎停止工作。

尝试使用StartedService和BroadcastReceiver
尝试使用IntentService和WakefulBroadcastReceiver

1.尝试在SAMSUNG Galaxy X COVER上工作，但在HUAWEI P9 Lite上没有。尽管我已经关闭了HUAWEI手机中的省电模式（Power Apps）。所以我的应用程序在屏幕关闭时继续运行。在例如10分钟之后，我在华为手机上打开了屏幕，看到服务正在运行的运行服务（经过几秒钟），所以我可以验证服务没有关闭。

2.屏幕关闭时，尝试无手机。

当屏幕开启（无睡眠）时，两次尝试都正常工作。

注意：为简洁起见，我删除了不相关方法的代码（获取/传输gps数据）。

以下是1.尝试的代码：

服务

[Service]
public class GpsTrackerService : Service
{
    private static readonly string LogTag = "X:TruckerApp-" + typeof(GpsTrackerService).Name;
    private static readonly int NOTIFICATION_ID = 10000;
    private MobileServiceClient _mobileServiceClient;

    public TelephonyManager GetTelefonyManager()
    {
        return (Android.Telephony.TelephonyManager) GetSystemService(TelephonyService);
    }

    public bool IsRunningAsService { get; set; }


    public override StartCommandResult OnStartCommand(Intent intent, StartCommandFlags flags, int startId)
    {
        Log.Debug(LogTag, "GpsTrackerService.OnStartCommand :: Service started. Timer instantiated.");
        GpsTrackerServiceUtils.SendGenericMessageToApplicationInsights("Gps-Info", LogTag, _mobileServiceClient, this, "GpsTrackerService.OnStartCommand :: Service started.Timer instantiated.");

        Task.Run(async () =>
        {
            try
            {
                await DoWork();
                await Task.Delay(TimeSpan.FromMinutes(2));
            }
            catch (Exception e)
            {
                Log.Debug(LogTag, $"GpsTrackerService.HandleTimerCallback :: (OUTER try-catch) Exception:{e.Message} Type:{e.GetType().Name}, Stacktrack:{e.StackTrace}");
                if (e.InnerException != null)
                {
                    Log.Debug(LogTag, $"GpsTrackerService.HandleTimerCallback :: (OUTER try-catch) Exception:{e.InnerException.Message} Type:{e.InnerException.GetType().Name}, Stacktrack:{e.InnerException.StackTrace}");
                }
                GpsTrackerServiceUtils.SendExceptionToApplicationInsights(e, LogTag, _mobileServiceClient, this);
            }
            finally
            {
                // Restart Service
                Intent broadcastIntent = new Intent(action: GpsConstants.GpsRestart);
                SendBroadcast(broadcastIntent);
            }

        });

        return StartCommandResult.Sticky;
    }

      public override IBinder OnBind(Intent intent)
    {
        // This is a started service, not a bound service, so we just return null.
        return null;
    }
}

广播接收器

[BroadcastReceiver(Enabled = true, Exported = true, Name = GpsConstants.GpsBroadcastReceiver, Label = "RestartServiceWhenStopped")]
[IntentFilter(new[] {GpsConstants.GpsRestart})]
public class GpsTrackerServiceBroadcastReceiver : BroadcastReceiver
{
    public override void OnReceive(Context context, Intent intent)
    {
        try
        {
            MetricsManagerHelper.Instance.SendGenericMessageToApplicationInsights("Gps-Info", "OnReceive :: Gps Service broadcast message received. Restarting GPS Service...");
            context.StartService(new Intent(context, typeof(GpsTrackerService)));
         }
        catch (Exception e)
        {
            MetricsManagerHelper.Instance.SendExceptionToApplicationInsights(e);
        }
    }
}

在MainActivity.OnCreate中注册Broadcastreceiver

 GpsTrackerServiceBroadcastReceiver = new GpsTrackerServiceBroadcastReceiver();
 RegisterReceiver(GpsTrackerServiceBroadcastReceiver, new IntentFilter(GpsConstants.GpsBroadcastReceiver));

2.Attempt

服务

[Service]
public class GpsTrackerIntentService : IntentService
{
    private static readonly string LogTag = "X:TruckerApp-" + typeof(GpsTrackerIntentService).Name;
    private static readonly int NOTIFICATION_ID = 10000;
    private MobileServiceClient _mobileServiceClient;

    public TelephonyManager GetTelefonyManager()
    {
        return (TelephonyManager) GetSystemService(TelephonyService);
    }

    protected override async void OnHandleIntent(Intent intent)
    {
        try
        {
            // perform task
            await Bootstrap();

            GpsTrackerServiceUtils.SendGenericMessageToApplicationInsightsWakeLock("Gps-Info", LogTag, _mobileServiceClient, this, "GpsTrackerService.OnHandleIntent :: Invoked.");

            await DoWork();
            await Task.Delay(TimeSpan.FromMinutes(2));
        }
        catch (Exception e)
        {
            Log.Debug(LogTag, $"GpsTrackerService.OnCreate :: Exception:{e.Message} Type:{e.GetType().Name}");
            GpsTrackerServiceUtils.SendExceptionToApplicationInsightsWakeLock(e, LogTag, _mobileServiceClient, this);
        }
        finally
        {
            WakefulBroadcastReceiver.CompleteWakefulIntent(intent);
            SendBroadcast(new Intent(this, typeof(GpsTrackerServceWakefulReceiver)));
            //var wakefulReceiverIntent = new Intent(this, typeof(GpsTrackerServceWakefulReceiver));
            //var pending = PendingIntent.GetBroadcast(this, 0, wakefulReceiverIntent, PendingIntentFlags.UpdateCurrent);
            //AlarmManager manager = (AlarmManager)GetSystemService(AlarmService);
            //manager.SetRepeating(AlarmType.RtcWakeup, SystemClock.ElapsedRealtime(), 120 * 1000, pending);
        }
    }


    public async Task DoWork()
    {
        // long running code ...
        Log.Debug(LogTag, "GpsTrackerService.HandleTimerCallback :: Invoked.");
        GpsTrackerServiceUtils.SendGenericMessageToApplicationInsightsWakeLock("Gps-Info", LogTag, _mobileServiceClient, this, "GpsTrackerService.HandleTimerCallback :: Invoked.");


    }
}

WakefulReceiver

[BroadcastReceiver]
public class GpsTrackerServceWakefulReceiver : WakefulBroadcastReceiver
{
    public override void OnReceive(Context context, Intent intent)
    {
        var serviceIntent = new Intent(context, typeof(GpsTrackerIntentService));
        StartWakefulService(context, serviceIntent);
    }
}

的AndroidManifest.xml

添加了WAKE_LOCK权限

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

我现在非常绝望。希望可以有人帮帮我。感谢

埃里克

Xamarin.Android：屏幕关闭时服务停止工作（Doze / App待机模式）

0 个答案: