java – Android Thread.start()CalledFromWrongThreadException

public class MainActivity extends Activity {

protected void onCreate(Bundle savedInstanceState) {
beginListenForData()
}

beginListenForData函数用于启动一个线程并检查数据是否有数据供读取.如果是这种情况,它会读取并更新UI变量：

void beginListenForData()
{
    Thread workerThread = new Thread(new Runnable() {
        @Override
        public void run()
        {    
            int bytesAvailable = 3;
            while(!Thread.currentThread().isInterrupted())
            {
                try
                {
                    bytesAvailable = mmInStream.available();
                    if(bytesAvailable > 0)
                    {
                        byte[] packetBytes = new byte[bytesAvailable];
                        mmInStream.read(packetBytes);
                bytesAvailable = mmInStream.available();
                String s = new String(packetBytes);
                text.setText(s);
                    }
                }
                catch (Exception e)
                {
            // TODO Auto-generated catch block
                e.printStackTrace();
                }
            }
        }
    });

       workerThread.start();
   }

}

我没有得到所需的输出.该线程应该读取数据或检查数据是否可用.如果可用,则读取它并将UI变量设置为读取的值.

我正确地执行了吗？我的代码中有什么问题吗？