Xamarin.Android中的后台服务

Question

我正在努力使用Xamarin.Android创建后台服务。后台服务应该每5分钟工作一次，并且应该在手机屏幕关闭或应用程序关闭时工作。您有任何想法如何实现这一目标。我发现该库正常运行，但问题是间隔在15分钟内无法正常运行。我不知道为什么。

https://www.c-sharpcorner.com/article/scheduling-work-with-workmanager-in-android/

我期待您的支持。谢谢。

Answer 1

using System;
using System;
using System.Threading;
using Android.App;
using Android.Content;
using Android.OS;
using OomaAndroid.Models;
using SQLite;

namespace OomaAndroid
{
    [Service]
    public class ServiceTest : Service
    {
        Timer timer;        
        public override void OnCreate()
        {
            base.OnCreate();
        }
        public override IBinder OnBind(Intent intent)
        {            
            return null;
        }


        public override StartCommandResult OnStartCommand(Intent intent, StartCommandFlags flags, int startId)
        {            
            timer = new Timer(HandleTimerCallback, 0, 0, 900000);
            return base.OnStartCommand(intent, flags, startId);
        }

        private void HandleTimerCallback(object state)
        {
            //this part codes will run every 15 minutes
        }
    }    
}

您也可以在MainActivity中运行服务

      Intent intSer = new Intent(base.ApplicationContext, typeof(OomaService));
      StartService(intSer);

还应该从用户处获得Receive_Boot_Compeleted权限，以在重新启动手机后运行服务

Answer 2

声明广播接收器：

using Android.Content;

[BroadcastReceiver]
public class BackgroundBroadcastReceiver : BroadcastReceiver
{
    public override void OnReceive(Context context, Intent intent)
    {
        // Your code here that will be executed periodically
    }
}

广播接收者注册：

// context - any of your Android activity

var intentAlarm = new Intent(context, typeof(BackgroundBroadcastReceiver));
var alarmManager = (AlarmManager)context.GetSystemService(Context.AlarmService);

alarmManager.SetRepeating(AlarmType.ElapsedRealtime, // Works even application\phone screen goes off
                          DateTimeOffset.UtcNow.ToUnixTimeMilliseconds(), // When to start (right now here)
                          1000, // Receiving interval. Set your value here in milliseconds.
                          PendingIntent.GetBroadcast(context, 1, intentAlarm, PendingIntentFlags.UpdateCurrent));