将值从服务获取到活动中

public class MyService extends Service {
    private final IBinder binder = new LocalBinder();

    public class LocalBinder extends Binder {
        MyService getService() {
            return MyService.this;
        }
    }

    public String getData() {
        // 模拟从服务器获取数据
        return "New Data from Service";
    }

    @Override
    public IBinder onBind(Intent intent) {
        return binder;
    }
}

public class MainActivity extends AppCompatActivity {
    private MyService myService;
    private boolean isBound = false;

    private ServiceConnection connection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName className, IBinder service) {
            MyService.LocalBinder binder = (MyService.LocalBinder) service;
            myService = binder.getService();
            isBound = true;
            updateUI();
        }

        @Override
        public void onServiceDisconnected(ComponentName arg0) {
            isBound = false;
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Intent intent = new Intent(this, MyService.class);
        bindService(intent, connection, Context.BIND_AUTO_CREATE);
    }

    private void updateUI() {
        if (isBound) {
            String data = myService.getData();
            TextView textView = findViewById(R.id.textView);
            textView.setText(data);
        }
    }

    @Override
 protected void onDestroy() {
        super.onDestroy();
        if (isBound) {
            unbindService(connection);
            isBound = false;
        }
    }
}