Programmiererforum

Code: Select all

// MyForegroundService.cs
using Android.App;
using Android.Content;
using Android.Content.PM;
using Android.OS;
using AndroidX.Core.App;
using System.Threading.Tasks;
using Resource = Microsoft.Maui.Resource;

[Service(ForegroundServiceType = ForegroundService.TypeLocation)]
public class MyForegroundService : Service
{
private const int ServiceRunningNotificationId = 10000;
private bool isRunning = true;

public override void OnCreate()
{
base.OnCreate();
System.Diagnostics.Debug.WriteLine("MyForegroundService: OnCreate");
StartForeground(ServiceRunningNotificationId, BuildNotification());
}

public override StartCommandResult OnStartCommand(Intent intent, StartCommandFlags flags, int startId)
{
System.Diagnostics.Debug.WriteLine("MyForegroundService: OnStartCommand");
Task.Run(async () =>
{
try
{
while (isRunning)
{
System.Diagnostics.Debug.WriteLine("MyForegroundService: Timer Tick");
await Task.Delay(10000);
}
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("MyForegroundService crashed: " + ex.Message);
}
});
return StartCommandResult.Sticky;
}

public override IBinder OnBind(Intent intent) => null;

public override void OnDestroy()
{
isRunning = false;
base.OnDestroy();
}

Notification BuildNotification()
{
var channelId = "foreground_service_channel";
var channelName = "Background Timer";
var manager = (NotificationManager)GetSystemService(NotificationService);

if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
{
var channel = new NotificationChannel(channelId, channelName, NotificationImportance.Default);
manager.CreateNotificationChannel(channel);
}

var notification = new NotificationCompat.Builder(this, channelId)
.SetContentTitle("Background Task Running")
.SetContentText("Your timer is active every 10 seconds.")
.SetSmallIcon(Resource.Drawable.ic_notification) // Replace with your icon
.SetOngoing(true)
.Build();

return notification;
}
}

Code: Select all

using AlertBuddies.Service;
using Android.Content;
using Android.OS;
using Microsoft.Maui.Controls;
using Android.App;
using Application = Android.App.Application;
using Android.Content.PM;

[assembly: Dependency(typeof(AlertBuddies.Platforms.Android.BackgroundService))]
namespace AlertBuddies.Platforms.Android
{
public class BackgroundService : IBackgroundService
{
public void Start()
{
System.Diagnostics.Debug.WriteLine("BackgroundService.Start() called");

var context = Application.Context;

var intent = new Intent(context, Java.Lang.Class.FromType(typeof(MyForegroundService)));

if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
context.StartForegroundService(intent);
else
context.StartService(intent);
}

public void Stop()
{
var context = Application.Context;
var intent = new Intent(context, Java.Lang.Class.FromType(typeof(MyForegroundService)));
context.StopService(intent);
}
}
}

Code: Select all

public interface IBackgroundService
{
void Start();
void Stop();
}

Code: Select all

//added under application tag

< /code>
Schließlich habe ich den Dienst vom Hauptprojekt wie unten gestartet: < /p>
DependencyService.Get()?.Start();
< /code>
Nach dem Ausführen des Projekts geschieht nichts. Ich habe einen Debugger im Hintergrund hinzugefügt, und das wird auch im Ausgangsfeld nicht angezeigt. < /P>
System.Diagnostics.Debug.WriteLine("BackgroundService.Start() called");