工作线程（后台线程）内操作UI线程（主线程）的方法汇集

• Activity.runOnUiThread(Runnable)
• View.post(Runnable)
• View.postDelayed(Runnable, long)

示例： 

publicvoid onClick(View v){
    newThread(newRunnable(){
        publicvoid run(){
            Bitmap b = loadImageFromNetwork("http://example.com/image.png");
            mImageView.setImageBitmap(b);
        }
    }).start();
}

更多可参考http://developer.android.com/guide/components/processes-and-threads.htm