線程在服務導致ANR

Question

我想在我的手機上響應多播DatagramPackets。這是保持引起ANR的部分代碼：

private void multicastLoop() { 
     String res = Build.FINGERPRINT + "\n"; 
     final InetAddress group; 
     final MulticastSocket socket; 
     final DatagramPacket response; 
     try { 
      group = InetAddress.getByName("239.255.255.127"); 
      socket = new MulticastSocket(port); 
      socket.setLoopbackMode(true); 
      socket.setSoTimeout(1000); 
      socket.joinGroup(group); 
      response = new DatagramPacket(res.getBytes(), res.length(), group, port); 
     } catch (IOException e) { 
      e.printStackTrace(); 
      return; 
     } 

     Thread t = new Thread(new Runnable() { 

      @Override 
      public void run() { 
       while(isRunning) { 
        try { 
         byte[] data = new byte[1024]; 
         DatagramPacket dm = new DatagramPacket(data, data.length); 
         socket.receive(dm); 
         if (Arrays.equals(dm.getData(), "someone there".getBytes())) { 
          socket.send(response); 
         } 
        } catch (SocketTimeoutException e) { 
         continue; 
        } catch (IOException e) { 
         e.printStackTrace(); 
        } 
       } 
       try { 
        socket.leaveGroup(group); 
        socket.close(); 
       } catch (IOException e) { 
        e.printStackTrace(); 
       } 
      } 

     }); 
     t.run(); 
    } 

方法multicastLoop是所謂的服務的onCreate，設置isRunning = true;爲什麼這個主題引起ANR錯誤後？在TCP-服務器多線程運行沒有問題（while (isRunning) {...}）

Answer 1

你需要調用t.start();代替t.run();

t.run()將只執行Runnable當前線程（UI），這將導致ANR上。