cómo ejecutar código en segundo plano sin que se abra la aplicación ejemplo de código xamarin de Android

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Ejemplo: cómo ejecutar código en segundo plano sin que se abra la aplicación android xamarin

using Xamarin.Forms;
using System;
using System.Linq;
using System.Diagnostics;

namespace YourNamespace

    public partial class App : Application
    
        private static Stopwatch stopWatch = new Stopwatch();
        private const int defaultTimespan = 1;

        protected override void OnStart()
        
            // On start runs when your application launches from a closed state, 

            if (!stopWatch.IsRunning)
            
                stopWatch.Start();
            

            Device.StartTimer(new TimeSpan(0, 0, 1), () =>
            
                // Logic for logging out if the device is inactive for a period of time.

                if (stopWatch.IsRunning && stopWatch.Elapsed.Minutes >= defaultTimespan)
                
                    //prepare to perform your data pull here as we have hit the 1 minute mark   

                        // Perform your long running operations here.

                        Device.InvokeOnMainThread(()=>
                            // If you need to do anything with your UI, you need to wrap it in this.
                        );

                    stopwatch.Restart();
                

                // Always return true as to keep our device timer running.
                return true;
            );
        

        protected override void OnSleep()
        
            // Ensure our stopwatch is reset so the elapsed time is 0.
            stopWatch.Reset();
        

        protected override void OnResume()
        
            // App enters the foreground so start our stopwatch again.
            stopWatch.Start();
        
    

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