線程UI更新報錯：Only the original thread that created a view hierarchy can touch its views.

當我們在線程裏面更新UI的時候會報錯：Only the original thread that created a view hierarchy can touch its views.
如下面的代碼：直接在UDP發送線程裏面更新UI，就會報錯，報錯提示如下。


這裏的解決辦法是把UI更新放到Handler裏面。所以把上述代碼的UI更新部分修改爲如下圖所示。