android中的Java线程回调

Question

不管什么原因，我的回拨电话打不通。基本上，我将使用我创建的tcp服务器进行群组聊天。我试图在java中创建一个线程，然后使用回调将我从套接字获得的信息提供给主活动。

当前收到得错误：

12-04 02:53:05.969  15143-15169/com.AndroidBabble E/AndroidRuntime﹕ FATAL EXCEPTION: Thread-4340
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()

public interface ResponseEvent {
  public void responseEvent();
}    

public class Main extends Activity implements ResponseEvent{
  Button btn;
  ClientTask client;
  String LOCALHOST = "localhost";
  int PORT = 5678;
  Thread thread;
  /**
   * Called when the activity is first created.
   */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    btn = (Button) findViewById(R.id.button);
//    Thread thread = new Thread(client = new ClientTask(this, LOCALHOST, PORT));
    client = new ClientTask(this, LOCALHOST, PORT);

  }

  public void button(View v){
    thread = new Thread(client);
    thread.start();

  }

  public void responseEvent(){
    Toast.makeText(getBaseContext(), "Trig", Toast.LENGTH_LONG).show();
  }


}

客户端任务

public class ClientTask implements Runnable{
  public Handler mHandler;
  private ResponseEvent re;
  BufferedReader in;
  Socket socket;
  String HOSTNAME;
  int PORT;
  String scan;

  public ClientTask(ResponseEvent event, String HOSTNAME, int PORT){
    re = event;
    this.HOSTNAME = HOSTNAME;
    this.PORT = PORT;
  }

  public void run(){
 //   try {
  //    socket = new Socket(HOSTNAME, PORT);
   //   in = new BufferedReader(new InputStreamReader(socket.getInputStream()));

      re.responseEvent();
//    } catch (IOException ex) {
    }
  }

最后，我想通过响应事件传递一个字符串，它将获得它的主要内容。

Answer 1

 public void responseEvent(){
    Toast.makeText(getBaseContext(), "Trig", Toast.LENGTH_LONG).show();
  }

在线程的上下文中调用responseevent。但是toast必须由UI线程处理。由于responseevent是在活动内部定义的,您可以使用runOnUiThread在UI线程队列中发布一个Runnable,