Android PullToRefresh上拉和下拉刷新

浏览数：30 / 时间：2015年06月11日

Github链接:

https://github.com/chrisbanes/Android-PullToRefresh

1. 设置Listview
layout文件中定义PullToRefreshListView

Xml代码

<com.jackie.PullToRefreshListView
android:id="@+id/list_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />

2. 设置Mode

PullToRefreshListView mListView = (PullToRefreshListView) findViewById(R.id.list_view);
mListView.setMode(Mode.BOTH);

可支持的Mode如下：

Mode.BOTH：同时支持上拉下拉
Mode.PULL_FROM_START：只支持下拉Pulling Down
Mode.PULL_FROM_END：只支持上拉Pulling Up

3. 实现监听Listener
如果Mode设置成Mode.BOTH，需要设置监听OnRefreshListener2，并实现onPullDownToRefresh()、onPullUpToRefresh()两个方法。

如果Mode设置成Mode.PULL_FROM_START或Mode.PULL_FROM_END，需要设置监听OnRefreshListener，同时实现onRefresh()方法。当然也可以设置为OnRefreshListener2，但是Mode.PULL_FROM_START的时候只调用onPullDownToRefresh()方法，Mode.PULL_FROM的时候只调用onPullUpToRefresh()方法。

4. 具体代码如下：

public class MainActivity extends Activity {
private ArrayList<String> mListItems;
private PullToRefreshListView mListView;
private SampleListAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.sample);
// 设置初期数据
mListItems = new ArrayList<String>();
for (int i = 1; i <= 10; i++) {
mListItems.add("Item " + Integer.toString(i));
}
// 设置ListView
mListView = (PullToRefreshListView) findViewById(R.id.list_view);
mAdapter = new SampleListAdapter();
mListView.setAdapter(mAdapter);
// 设置PullToRefresh
mListView.setMode(Mode.BOTH);
mListView.setOnRefreshListener(new OnRefreshListener2<ListView>(){
// 下拉Pulling Down
@Override
public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {
// 下拉的时候数据重置
mListItems = new ArrayList<String>();
for (int i = 1; i <= 10; i++) {
mListItems.add("Item " + Integer.toString(i));
}
mAdapter.notifyDataSetChanged();
new FinishRefresh().execute();
}
// 上拉Pulling Up
@Override
public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {
// 上拉的时候添加选项
int count = mListItems.size();
mListItems.add("Item " + Integer.toString(++count));
mAdapter.notifyDataSetChanged();
new FinishRefresh().execute();
}
});
}
private class SampleListAdapter extends BaseAdapter {
@Override
public int getCount() {
return mListItems.size();
}
@Override
public Object getItem(int index) {
return mListItems.get(index);
}
@Override
public long getItemId(int index) {
return index;
}
@Override
public View getView(int index, View view, ViewGroup arg2) {
if(view == null){
LayoutInflater inflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.list_item, null);
}
TextView textView = (TextView)view.findViewById(R.id.listItemText);
textView.setText(mListItems.get(index));
return view;
}
}
private class FinishRefresh extends AsyncTask<Void, Void, Void>{
@Override
protected Void doInBackground(Void... params) {
return null;
}
@Override
protected void onPostExecute(Void result){
mListView.onRefreshComplete();
}
}
}