Unfortunately, it violates the single-threaded model for the UI: the Android UI toolkit is not thread-safe and must always be manipulated on the UI thread.
但不幸的是，上面的代码违背了UI线程的单线程模式：Android UItoolkit不是线程安全的，所以对UI的操作都应该在主ui线程中进行。
Unfortunately, it violates the single-threaded model for the UI: the Android UI toolkit is not thread-safe and must always be manipulated on the UI thread.
但不幸的是，上面的代码违背了UI线程的单线程模式：Android UItoolkit不是线程安全的，所以对UI的操作都应该在主ui线程中进行。
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