我正在开发一个聊天应用程序。目前,当我打开 ChatActvity 时,我确实喜欢这样,所有套接字都已注册并且聊天正常...现在我想更改编码结构..我想在类中打开套接字,而不是在 Activity 类中,我需要向该类添加一个监听器。我如何实现这个..?
private class Chatroom {
private static void initialise() {
// Initialising the sockets and registering listeners to each socket
}
}
当 Chatroom 类中的套接字监听器被调用时,我想在我的 Activity 类中发出通知。
最佳答案
这可能是您需要的:
public class RequestSender extends AsyncTask<String, Void, String> {
private final static String serverIP = "192.168.1.1";
private final static Integer serverPort = 1234;
private ServerResponseListener listener = null;
public void setServerResponseListener(ServerResponseListener listener){
this.listener=listener;
}
public interface ServerResponseListener {
public void onResponseReceive(String response);
}
@Override
protected String doInBackground(String... params) {
Socket socket = null;
try {
socket = new Socket(serverIP, serverPort);
} catch (IOException e) {
// return "server is unreachable" message or something
}
PrintWriter requestWriter = new PrintWriter(socket.getOutputStream());
BufferedReader resultReader = new BufferedReader(new InputStreamReader(
socket.getInputStream()));
String request = params[0] //for example
requestWriter.println(request);
requestWriter.flush();
String result = null;
while ((result = resultReader.readLine()) != null) {}
return result;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
listener.onResponseReceive(result);
}
}
这里是如何从 Activity 执行 AsynchTask 的示例:
public class MainActivity extends Activity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RequestSender requestSender = new RequestSender();
requestSender.setServerResponseListener(new RequestSender.ServerResponseListener(){
@override
public void onResponseReceive(String response){
//
}
});
requestSender.execute("message");
}
}
阅读此内容:http://developer.android.com/reference/android/os/AsyncTask.html
关于java - 自定义监听器,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27763734/