Android 的View不是线程安全的.

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当在UI 线程之外更新view组件时会出现exception.

E/AndroidRuntime( 4371): FATAL EXCEPTION: Thread-10
E/AndroidRuntime( 4371): android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
E/AndroidRuntime( 4371):        at android.view.ViewRoot.checkThread(ViewRoot.java:3020)
E/AndroidRuntime( 4371):        at android.view.ViewRoot.requestLayout(ViewRoot.java:634)
E/AndroidRuntime( 4371):        at android.view.View.requestLayout(View.java:8320)
E/AndroidRuntime( 4371):        at android.view.View.requestLayout(View.java:8320)
E/AndroidRuntime( 4371):        at android.view.View.requestLayout(View.java:8320)
E/AndroidRuntime( 4371):        at android.view.View.requestLayout(View.java:8320)
E/AndroidRuntime( 4371):        at android.view.View.requestLayout(View.java:8320)
E/AndroidRuntime( 4371):        at android.widget.TextView.checkForRelayout(TextView.java:5608)
E/AndroidRuntime( 4371):        at android.widget.TextView.setText(TextView.java:2783)
E/AndroidRuntime( 4371):        at android.widget.TextView.setText(TextView.java:2644)
E/AndroidRuntime( 4371):        at android.widget.TextView.setText(TextView.java:2619)
E/AndroidRuntime( 4371):        at com.example.test.UIThreadctivity$UIThreadUpdate.run(UIThreadctivity.java:42)