学步园

效果图：

        android中提供了ListView控件，listview能够为我们展现丰富的内容，有时候我们为了提升用户体检，需要更炫而且更好用户体验的效果，pull to refresh（下拉刷新列表效果）就应运而生了。

        pull to refresh更多的应用于获取最新的内容，比如新浪微博、腾讯微博等。目前网上有很多开源的pull to refresh的开源实现，这里也是参考开源代码实现的。

Layout

<!--
The PullToRefreshListView replaces a standard ListView widget.
-->
<com.markupartist.android.widget.PullToRefreshListView
    android:id="@+id/android:list"
    android:layout_height="fill_parent"
    android:layout_width="fill_parent"
    />

Activity

// Set a listener to be invoked when the list should be refreshed.
((PullToRefreshListView) getListView()).setOnRefreshListener(new OnRefreshListener() {
    @Override
    public void onRefresh() {
        // Do work to refresh the list here.
        new GetDataTask().execute();
    }
});

private class GetDataTask extends AsyncTask<Void, Void, String[]> {
    ...
    @Override
    protected void onPostExecute(String[] result) {
        mListItems.addFirst("Added after refresh...");
        // Call onRefreshComplete when the list has been refreshed.
        ((PullToRefreshListView) getListView()).onRefreshComplete();
        super.onPostExecute(result);
    }
}