java - Android 中的线程问题

Question

我正在开发 Android 中的应用程序。我正在尝试从后台线程将数据更新到 UI。但是，由于某些原因它不起作用。任何人都可以指出错误或提出任何更好的解决方案吗？我使用 Thread 从蓝牙套接字读取数据并使用 RunOntheUI 更新 UI。这是代码:

socket = belt.createRfcommSocketToServiceRecord(UUID_SECURE);
            socket.connect();

                   stream = socket.getInputStream();
                    //  final int intch;
                       Thread timer2 = new Thread() { // Threads - do multiple things
                            public void run() {
                                try {

                                   // read data from input stream if the end has not been reached
                                   while ((intch = stream.read()) != -1) {

                                       byte ch = (byte) intch;
                                       b1.append(ByteToHexString(ch) +"/");
                                        decoder.Decode(b1.toString());  
                                        runOnUiThread(new Runnable() {
                                            public void run()
                                            {
// update the uI

                                        hRMonitor.SetHeartRateValue((int) decoder.GetHeartRate());
                                            }
                                        });
                                        Thread.sleep(1000);
                                   }
                                } catch (Exception e) {
                                       e.printStackTrace();
                                   } 
                                }};

                                timer2.start();

Answer 1

使用

Your_Current_Activity.this.runOnUiThread(new Runnable() {
            @Override
            public void run() {
             hRMonitor.SetHeartRateValue((int) decoder.GetHeartRate());
           }
       });

而不是

runOnUiThread(new Runnable() {
      public void run()
      {
      // update the uI
      hRMonitor.SetHeartRateValue((int) decoder.GetHeartRate());
      }
   });