服务的启动和停止

Question

我正在编写this 中的服务教程 ..我能够让它完美运行我所做的尝试是在Oncreate 上启动服务，它确实让它在后退按钮上停止但不幸的是@ 987654324@ 不起作用，因为它没有显示吐司，这里是我的代码..是什么导致 onstop 不起作用

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();
    }

服务代码

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

用下面的代码替换你的代码

    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();
        }