onstart and onstop of service

Question

i am working on a tutorial on service in this ..i was able to make it run perfectly what i did try is to start service on Oncreate and it did and make it stop on back button but unfortunately onstop does not work because it is not showing toast and log here is my code..what causes onstop not to work

public void onBackPressed() {


        AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);

        builder.setTitle("Confirm Close");

        builder.setMessage("Are you sure you want to exit?");

        builder.setPositiveButton("Yes",new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                stopService(new Intent(this, MyService.class));
                System.exit(0);
                finish();
                android.os.Process.killProcess(android.os.Process.myPid());
            }
        });
        builder.setNegativeButton("No", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
            }
        });
        AlertDialog alertdialog=builder.create();
        alertdialog.show();
    }

service code

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;

public class MyService extends Service{

    private static final String TAG = "MyService";

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }

    @Override
    public void onCreate() {
        Toast.makeText(this, "Congrats! MyService Created", Toast.LENGTH_LONG).show();
        Log.d(TAG, "onCreate");
    }

    @Override
    public void onStart(Intent intent, int startId) {
        Toast.makeText(this, "My Service Started", Toast.LENGTH_LONG).show();
        Log.d(TAG, "onStart");
    //Note: You can start a new thread and use it for long background processing from here.
    }

    @Override
    public void onDestroy() {
        Toast.makeText(this, "MyService Stopped", Toast.LENGTH_LONG).show();
        Log.d(TAG, "onDestroy");
    }
}

Answer 1

Replace your code by following code

    public void onBackPressed() {


            AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);

            builder.setTitle("Confirm Close");

            builder.setMessage("Are you sure you want to exit?");

            builder.setPositiveButton("Yes",new DialogInterface.OnClickListener() {

                @Override
                public void onClick(DialogInterface dialog, int which) {
                    stopService(new Intent(this, MyService.class));
                   Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
                }
            });
            builder.setNegativeButton("No", new DialogInterface.OnClickListener() {

                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.cancel();
                }
            });
            AlertDialog alertdialog=builder.create();
            alertdialog.show();
        }