pulltorefresh的用法以及message传值

最新推荐文章于 2025-02-20 17:56:31 发布

原创最新推荐文章于 2025-02-20 17:56:31 发布 · 319 阅读

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本文介绍了一个基于Android的应用示例，展示了如何利用PullToRefreshListView组件实现下拉刷新和上拉加载更多功能，并通过HTTP请求获取远程数据，解析JSON格式的数据源，最后将数据绑定到自定义适配器显示在列表视图中。

import java.io.IOException;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.widget.ListView;
import com.baway.test.MyAdapter.MyAdapter;
import com.baway.test.bean.Dx;
import com.baway.test.bean.Result;
import com.google.gson.Gson;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshBase.Mode;
import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener2;
import com.handmark.pulltorefresh.library.PullToRefreshListView;

public class MainActivity extends Activity {

   private Handler handler=new Handler(){
       public void handleMessage(android.os.Message msg) {

           List<Result> list1=(List<Result>) msg.obj;

           adapter = new MyAdapter(MainActivity.this,list1);

           pl.setAdapter(adapter);

           adapter.notifyDataSetChanged();
           pl.onRefreshComplete();

       }
   };
   private List<Result> li;
   private MyAdapter adapter;
   private PullToRefreshListView pl;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);

       setContentView(R.layout.activity_main);


       pl = (PullToRefreshListView) findViewById(R.id.pl);
       pl.setMode(Mode.BOTH);
       initData();


       pl.setOnRefreshListener(new OnRefreshListener2<ListView>() {

           @Override
           public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {
               // TODO Auto-generated method stub

               initData();

           }

           @Override
           public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {
               // TODO Auto-generated method stub
               initData();
           }

       });
   }

   //申请数据
   protected void initData() {

       new Thread(){
           public void run() {
               try {
                   HttpClient client=new DefaultHttpClient();
                   HttpGet get=new HttpGet("http://v.juhe.cn/gerenshebao/test/getcities.php?key=ad6daef945cdd9aab38bbacefd9f22f8");
                   HttpResponse response = client.execute(get);
                   if(response.getStatusLine().getStatusCode()==200){
                       HttpEntity entity = response.getEntity();
                       String content = EntityUtils.toString(entity);

                       Gson gson=new Gson();
                       Dx fromJson = gson.fromJson(content, Dx.class);
                       List<Result> result = fromJson.getResult();

                       Message msg = Message.obtain();
                       msg.obj=result;
                   //   msg.what=a;
                       handler.sendMessage(msg);
                   }
               } catch (ClientProtocolException e) {
                   // TODO Auto-generated catch block
                   e.printStackTrace();
               } catch (IOException e) {
                   // TODO Auto-generated catch block
                   e.printStackTrace();
               }
           }
       }.start();
   }


}