public class MainActivity extends AppCompatActivity {

    private MyConn conn;

    private Iservice myBinder; // 我定义的中间人对象

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        Intent intent = new Intent(this, DemoService.class);

        //连接服务

        conn = new MyConn();

        bindService(intent, conn, BIND_AUTO_CREATE);

    }

    //点击按钮调用服务里面banzheng的方法

    public void click(View v) {

        myBinder.callBanZheng();

    }

    //监视服务的状态

    private class MyConn implements ServiceConnection{

        //当服务连接成功调用

        @Override

        public void onServiceConnected(ComponentName name, IBinder service) {

            //获取中间人对象

            myBinder = (Iservice) service;

        }

        //失去连接

        @Override

        public void onServiceDisconnected(ComponentName name) {

        }

    }

    @Override

    protected void onDestroy() {

        //当Activity销毁的时候 解绑服务

        unbindService(conn);

        super.onDestroy();

    }

}

public class DemoService extends Service {

    private static final String TAG = "jojp";

    public DemoService() {

    }

    // 把我定义的中间人对象返回

    @Override

    public IBinder onBind(Intent intent) {

        // TODO: Return the communication channel to the service.

//        throw new UnsupportedOperationException("Not yet implemented");

        return new MyBinder();

    }

    //banzheng的方法

    public void banZheng(int money) {

        if (money > ) {

            Toast.makeText(getApplicationContext(), "banZheng", Toast.LENGTH_SHORT).show();

        } else {

            Toast.makeText(getApplicationContext(), "banZhengFail", Toast.LENGTH_SHORT).show();

        }

    }

    //打麻将的方法

    public void playMaJiang() {

        Log.d(TAG, "playMaJiang: ");

    }

    //洗桑拿的方法

    public void sangNa() {

        Log.d(TAG, "sangNa: ");

    }

    private class MyBinder extends Binder implements Iservice{

        @Override

        public void callBanZheng(int money) {

            //调用banzheng的方法

            banZheng(money);

        }

        public void callPlayMaJiang() {

            //调用playMaJiang的方法

            playMaJiang();

        }

        public void callSangNa() {

            //调用洗桑拿的方法

            sangNa();

        }

    }

}

public interface Iservice {

    //把领导想暴露的方法都定义在接口里

    public void callBanZheng(int money);

}