try {
  Socket s = new Socket("192.168.1.5", 8240);
  InputStream inputStream = s.getInputStream();
  DataInputStream input = new DataInputStream(inputStream);
  byte[] b = new byte[10000];
  while(true)
  {
    int length = input.read(b);
    String Msg = new String(b, 0, length, "gb2312");
    Log.v("data",Msg);
  }
}catch(Exception ex)
{
  ex.printStackTrace();
}

// Activity按鈕事件中
GetLogTask task = new GetLogTask();
task.execute(null);
// Activity類中嵌套類
public class GetLogTask extends AsyncTask<Void,Void,String>
{
  @Override
  protected String doInBackground(Void...param){
      try {
      Socket s = new Socket("192.168.1.5", 8240);
      InputStream inputStream = s.getInputStream();
      DataInputStream input = new DataInputStream(inputStream);
      byte[] b = new byte[10000];
      while(true)
      {
        int length = input.read(b);
        String Msg = new String(b, 0, length, "gb2312");
        Log.v("data",Msg);
      }
    }catch(Exception ex)
    {
      ex.printStackTrace();
    }
    return "";
  }
}

Handler handler = new Handler(){
  @Override
  public void handleMessage(Message msg){
    text.setText(text.getText().toString()+(String)msg.obj);
  }
};

Message msg = new Message();
msg.obj = msgstring;
(MainActivity.this).handler.postMessage();