利用接口调用服务中特定的方法

利用接口调用服务中特定的方法，好处：是为了保护服务中的其他方法

public interface PayInterface {
    public void interface_pay();
}

public class PayService extends Service {
   class MyBinder extends Binder implements PayInterface{

       @Override
       public void interface_pay() {
           pay();
       }
   }
    @Override
    public IBinder onBind(Intent intent) {
        MyBinder binder = new MyBinder();
        return binder;
    }

    @Override
    public void onCreate() {
        super.onCreate();
    }
    public void pay(){
        System.out.println("支付服务");
    }
}

public class MainActivity extends AppCompatActivity {
    private Intent intent;
    private MyServiceConnection serviceConnection;
    private PayInterface payInterface;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        intent = new Intent(this,PayService.class);
        serviceConnection = new MyServiceConnection();
    }
    public void bind(View view){
        bindService(intent,serviceConnection,BIND_AUTO_CREATE);
    }
    public void pay(View view){
        if(payInterface!=null){
            payInterface.interface_pay();//调用支付功能。
        }
    }
    class MyServiceConnection implements ServiceConnection{

        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
             payInterface = (PayInterface) service;

        }

        @Override
        public void onServiceDisconnected(ComponentName name) {

        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unbindService(serviceConnection);
    }
}