Android PullToRefresh上拉和下拉刷新

2015/03/20 32557

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Github链接:

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

GUIDE：

https://github.com/chrisbanes/Android-PullToRefresh/wiki/Quick-Start-Guide

1. 设置Listview 
layout文件中定义PullToRefreshListView 

Xml代码

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

2. 设置Mode 
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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：
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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(); 
        } 
    } 
}