View.post()方法的使用

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public boolean post(Runnable action) {    final AttachInfo attachInfo = mAttachInfo;    if (attachInfo != null) {        return attachInfo.mHandler.post(action);    }    // Assume that post will succeed later    ViewRootImpl.getRunQueue().post(action);    return true;}

在view已经添加到窗口时，立即加入执行队列，否则等添加到窗口后，添加到执行队列

实例：

@Overridepublic void onResume() {    super.onResume();    if(!mList.isEmpty()){        // need to call this method from list view handler in order to have list filled previously        mListView.post(new Runnable() {            @Override            public void run() {                mListItemVisibilityCalculator.onScrollStateIdle(                        mItemsPositionGetter,                        mListView.getFirstVisiblePosition(),                        mListView.getLastVisiblePosition());            }        });    }}

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