PullToRefreshListView局部刷新

省略ListView性能优化的介绍。。。以下介绍一下局部刷新，主要介绍PullToRefreshListView如何进行局部刷新。

使用ListView进行局部刷新很简单，代码如下：

<span style="font-family:Microsoft YaHei;font-size:14px;">int offset = position - listView.getFirstVisiblePosition();View convertView = listView.getChildAt(offset);ViewHolder holder = (ViewHolder) convertView.getTag();adapterLv.updateView(holder, "局部刷新");list.set(position, "局部刷新");</span>

关键代码是：

<span style="font-family: 'Microsoft YaHei';"><span style="font-size:14px;">listView.getFirstVisiblePosition();</span></span>

<span style="font-family: 'Microsoft YaHei';"><span style="font-size:14px;">listView.getChildAt(offset);</span></span>

使用PullToRefreshListView的时候，直接通过new PullToRefreshListView没有找到 getFirstVisiblePosition()的API；

<span style="font-family: 'Microsoft YaHei';">getChildAt()方法虽然有，但查看源码就知道，PullToRefreshListView只是在PullToRefreshAdapterViewBase这个真正的AbsListView子类上的一层封装，所以需要在</span><span style="font-family: 'Microsoft YaHei';">PullToRefreshAdapterViewBase中添加这两个方法，（局部刷新调用同ListView）如下：</span>

<span style="font-family: 'Microsoft YaHei';">Done! 上班时间写的，太乱没详细说明。</span>

源码：

public class TestActivity extends Activity {


    private PullToRefreshListView lv;
    private ListView listView;
    private List<String> list = new ArrayList<>();
    private AdapterLv adapterLv;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.test_activity);
        lv = (PullToRefreshListView) findViewById(R.id.lv);
        listView = (ListView) findViewById(R.id.listview);
        lv.setOnItemClickListener(new OnItemClickListener() {


            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                int offset = position - lv.getFirstVisiblePosition();
                View convertView = (View) lv.getChidViewAt(offset);
                AdapterLv.ViewHolder holder = (ViewHolder) convertView.getTag();
                adapterLv.updateView(holder, "局部刷新");
            }
        });
//        listView.setOnItemClickListener(new OnItemClickListener() {
//
//            @Override
//            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//                int offset = position - listView.getFirstVisiblePosition();
//                View convertView = listView.getChildAt(offset);
//                AdapterLv.ViewHolder holder = (ViewHolder) convertView.getTag();
//                adapterLv.updateView(holder, "局部刷新");
//                list.set(position, "局部刷新");
//            }
//        });
        
        for (int i = 0; i < 30; i++) {
            list.add("Text : " + i);
        }
        adapterLv = new AdapterLv(this, list);
         lv.setAdapter(adapterLv);
//        listView.setAdapter(adapterLv);
    }


}