PullToRefresh实现上拉加载下拉刷新

//下面我们用GridView做展示 PullToRefresh可以用于多种组件的上拉加载下拉刷新
让我们看一下gridView的布局

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.baway.test.MainActivity" >


    <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>

主来中的实现代码：

import java.util.List;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.text.format.DateUtils;
import android.widget.GridView;
import android.widget.Toast;
import com.baway.bean.Book;
import com.baway.bean.MyAdapter;
import com.baway.bean.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;

public class MainActivity extends ActionBarActivity {
     private PullToRefreshGridView mGridView;
     private int i=10;
     private GridView actualListView;
     private MyAdapter adapter;
    @SuppressWarnings("unchecked")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

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

            @Override
            protected void onPostExecute(List<Book> result) {
                adapter=new MyAdapter(MainActivity.this,result);//这个地方需要添加参数
                actualListView.setAdapter(adapter);
                adapter.notifyDataSetChanged();
                mGridView.onRefreshComplete();
                super.onPostExecute(result);
            }

}
}

当然了我们还需要写javabean adapter httpClient连接网络请求数据，最后不要忘了添加连接网络的权限 此处就不贴代码了