PullToRefresh上拉刷新下拉加载

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<com.handmark.pulltorefresh.library.PullToRefreshGridView
android:id="@+id/pull_refresh_list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:cacheColorHint="#00000000"
android:numColumns="3"
android:divider="#19000000"
android:dividerHeight="4dp"
android:fadingEdge="none"
android:fastScrollEnabled="false"
android:footerDividersEnabled="false"
android:headerDividersEnabled="false"
android:smoothScrollbar="true"
/>

</RelativeLayout>

import java.util.ArrayList;
import java.util.List;
import com.example.adapter.MyAdapter;
import com.example.bean.B;
import com.example.client.MyHttpClient;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshBase.OnLastItemVisibleListener;
import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener;
import com.handmark.pulltorefresh.library.PullToRefreshGridView;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.format.DateUtils;
import android.widget.GridView;
import android.widget.Toast;

public class InfoActivity extends Activity {
private PullToRefreshGridView mGridView;
private int i = 10;
private GridView actualListView;
private MyAdapter adapter;
private long mExitTime;
private int port=1;
private List<B> list=new ArrayList<B>();
private List<B> data=new ArrayList<B>();

Handler handler=new Handler(){
public void handleMessage(Message msg) {
//首先我们使用集合添加数据
list=(List<B>) msg.obj;
if (port==1) {//也就是说第一次联网请求数据
data.clear();//清空集合中的数据
}
data.addAll(list);//将这个数据添加到适配器器上面展示一下
if (adapter==null) {
adapter=new MyAdapter(InfoActivity.this, data);
actualListView.setAdapter(adapter);
mGridView.onRefreshComplete();
}else {
//适配器通知数据发生改变
adapter.notifyDataSetChanged();
mGridView.onRefreshComplete();
}

};
};
@SuppressWarnings("unchecked")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_info);

mGridView = (PullToRefreshGridView) findViewById(R.id.pull_refresh_list);// 1
mGridView.setOnRefreshListener(new OnRefreshListener() { // 2
@Override
public void onRefresh(PullToRefreshBase refreshView) {
String label = DateUtils.formatDateTime(
getApplicationContext(),
System.currentTimeMillis(),
DateUtils.FORMAT_SHOW_TIME
| DateUtils.FORMAT_SHOW_DATE
| DateUtils.FORMAT_ABBREV_ALL);
refreshView.getLoadingLayoutProxy()
.setLastUpdatedLabel(label);// 3.刷新界面处理代理,显示新的时间
new GetDataTask().execute();// 4.执行自定义AsyncTask,进行数据的请求刷新
}
});
mGridView.setOnLastItemVisibleListener(new OnLastItemVisibleListener() {

@Override
public void onLastItemVisible() {
Toast.makeText(InfoActivity.this, "正在加载。。。", 0).show();
new GetDataTask().execute();// 4.执行自定义AsyncTask,进行数据的请求刷新
}
});
actualListView = mGridView.getRefreshableView();// 6!!!----从下拉刷新组件中获得ListView组件，以便适配数据
}

private class GetDataTask extends AsyncTask<Void, Void, List<B>> {
@Override
protected List<B> doInBackground(Void... params) {
String url = "http://apis.juhe.cn/goodbook/query?key=9d6ef8c31647a206e05fcaff70527182&catalog_id=246&pn="+i+"&rn=10";
i++;
port++;
List<B> list = null;
MyHttpClient httpClient = new MyHttpClient();
list = httpClient.myClient(url);
return list;
}

@Override
protected void onPostExecute(List<B> result) {
Message message=Message.obtain();
message.obj=result;
handler.sendMessage(message);
/*adapter = new MyAdapter(InfoActivity.this, result);// 这个地方需要添加参数
actualListView.setAdapter(adapter);
adapter.notifyDataSetChanged();
mGridView.onRefreshComplete();*/
super.onPostExecute(result);
}
}
}