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如果我每 120 秒发送一次 GPS（纬度/经度），我必须实施一项服务。到我的 REST 后端。

我的问题是屏幕关闭时服务似乎停止工作。

  1. 尝试使用 StartedService 和 BroadcastReceiver
  2. 尝试使用 IntentService 和 WakefulBroadcastReceiver

1. Attempt 例如适用于 SAMSUNG Galaxy X COVER，但不适用于 HUAWEI P9 Lite。尽管我关闭了华为手机中的省电模式（Power Apps）。所以当屏幕关闭时我的应用程序会继续运行。例如 10 分钟后，我在华为手机上打开屏幕并在运行服务中看到服务正在运行（经过的秒数），因此我可以验证服务没有关闭。

2. 屏幕关闭时尝试在没有手机的情况下工作。

当屏幕打开（无睡眠）时，这两种尝试都正常工作。

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）。

这是1的代码。尝试：

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.尝试

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.");


    }
}

唤醒接收器

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

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"/>

我现在真的很绝望。希望可以有人帮帮我。谢谢

埃里克

4

0 回答 0