android ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hi
E/AndroidRuntime(1456): android.view.ViewRootImpl$CalledFromWrongThreadException:
Only the original thread that created a view hierarchy can touch its views.
子线程不能更新UI
子线程不直接更新UI,必须通知UI线程(主线程)去更新UI
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