线程UI更新报错：Only the original thread that created a view hierarchy can touch its views.
当我们在线程里面更新UI的时候会报错：Only the original thread that created a view hierarchy can touch its views.
如下面的代码：直接在UDP发送线程里面更新UI，就会报错，报错提示如下。
这里的解决办法是把UI更新放到Handler里面。所以把上述代码的UI更新部分修改为如下图所示。