从根本上讲,我想从IntentService建立对Activity的回调。我的问题与此处回答的问题非常相似:
Restful API service
但是,在答案代码中, Activity 代码被视为实现了ResultReceiver。除非我缺少任何内容,否则ResultReceiver实际上是一个类,因此它无法执行此实现。
所以从本质上讲,我在问将ResultReceiver连接到该服务的正确方法是什么。关于这一点,我对Handler和ResultReceiver概念感到困惑。任何有效的示例代码将不胜感激。
最佳答案
ResultReceiver
intentservice只是获取接收者对象并调用
receiver.send()函数可将任何内容发送到
bundle 对象。
这是customResultReceiver类:
public class MyResultReceiver extends ResultReceiver {
private Receiver mReceiver;
public MyResultReceiver(Handler handler) {
super(handler);
// TODO Auto-generated constructor stub
}
public interface Receiver {
public void onReceiveResult(int resultCode, Bundle resultData);
}
public void setReceiver(Receiver receiver) {
mReceiver = receiver;
}
@Override
protected void onReceiveResult(int resultCode, Bundle resultData) {
if (mReceiver != null) {
mReceiver.onReceiveResult(resultCode, resultData);
}
}
}
在您的 Activity 中实现Myresultreceiver.receiver接口(interface),创建一个类变量
Public MyResultReceiver mReceiver;
在onCreate中初始化此变量:
mReceiver = new MyResultReceiver(new Handler());
mReceiver.setReceiver(this);
通过以下方式将此mReceiver传递给intentService:
intent.putExtra("receiverTag", mReceiver);
并在IntentService中获取,例如:
ResultReceiver rec = intent.getParcelableExtra("receiverTag");
并使用rec将任何内容发送到 Activity :
Bundle b=new Bundle();
rec.send(0, b);
这将在 Activity 的onReceiveResult中接收。您可以在以下位置查看完整的代码:IntentService: Providing data back to Activity
编辑:您应该在onResume中调用setReceiver(this),在onPause()中调用setReceiver(null)以避免泄漏。