Activity类的runOnUiThread方法

/**
 * Runs the specified action on the UI thread. If the current thread is the UI
 * thread, then the action is executed immediately. If the current thread is
 * not the UI thread, the action is posted to the event queue of the UI thread.
 *
 * @param action the action to run on the UI thread
 */
public final void runOnUiThread(Runnable action) {
    if (Thread.currentThread() != mUiThread) {
        mHandler.post(action);
    } else {
        action.run();
    }
}

使用：

 runOnUiThread可以帮助你在线程中执行UI更新操作，我们只需要在线程中写上类似

     youractivity. runOnUiThread(new Runnable() { 
                    @Override 
                        public void run() { 

                           // refresh ui 的操作代码

                        } 
                    });

  这里需要注意的是runOnUiThread是Activity中的方法，在线程中我们需要告诉系统是哪个activity调用，所以前面显示的指明了activity。