Android开发----Listview刷新的相关代码

Mainactity

public class MainActivity extends ListActivity {
   static final int MENU_MANUAL_REFRESH = 0;
   static final int MENU_DISABLE_SCROLL = 1;
   static final int MENU_SET_MODE = 2;
   static final int MENU_DEMO = 3;
   int index=1;

   private PullToRefreshListView mPullRefreshListView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       mPullRefreshListView = (PullToRefreshListView) findViewById(R.id.pull_refresh_list);//1
       new GetDataTask().execute("http://api.expoon.com/AppNews/getNewsList/type/1/p/"+index);
       // Set a listener to be invoked when the list should be refreshed.下拉刷新处理
       mPullRefreshListView.setOnRefreshListener(new OnRefreshListener<ListView>() {       //2
           @Override
           public void onRefresh(PullToRefreshBase<ListView> refreshView) {
               String label = DateUtils.formatDateTime(getApplicationContext(), System.currentTimeMillis(),
                       DateUtils.FORMAT_SHOW_TIME | DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_ABBREV_ALL);

               // Update the LastUpdatedLabel
               refreshView.getLoadingLayoutProxy().setLastUpdatedLabel(label);//3.刷新界面处理代理,显示新的时间

               // Do work to refresh the list here.

               new GetDataTask().execute("http://api.expoon.com/AppNews/getNewsList/type/1/p/"+index);                                   //4.执行自定义AsyncTask,进行数据的请求刷新
           }
       });

       // Add an end-of-list listener                                       //5.设置上拉加载处理
       mPullRefreshListView.setOnLastItemVisibleListener(new OnLastItemVisibleListener() {

           @Override
           public void onLastItemVisible() {

               new GetDataTask().execute("http://api.expoon.com/AppNews/getNewsList/type/1/p/"+index);
               Toast.makeText(MainActivity.this, "正在加载", 1).show();
           }
       });


    }

    private class GetDataTask extends AsyncTask<String, Integer, String> {

       @Override
       protected String doInBackground(String... params) {
           // Simulates a background job.
           String json = null;
           try {

               Thread.sleep(4000);
               HttpClient httpClient=new DefaultHttpClient();
                   HttpGet httpGet=new HttpGet(params[0]);
                   try {
                   HttpResponse execute = httpClient.execute(httpGet);
                   int statusCode = execute.getStatusLine().getStatusCode();
                   if(statusCode==200){
                       HttpEntity entity = execute.getEntity();
                       json = EntityUtils.toString(entity);
                       Log.i("aaa",json);
                   }
               } catch (ClientProtocolException e) {
                   // TODO Auto-generated catch block
                   e.printStackTrace();
               } catch (IOException e) {
                   // TODO Auto-generated catch block
                   e.printStackTrace();
               }

           } catch (InterruptedException e) {}


           return json;
       }

       @Override
       protected void onPostExecute(String result) {
           super.onPostExecute(result);
           Gson gson=new Gson();
           final List_news fromJson = gson.fromJson(result,List_news.class);
           Log.i("bbb",fromJson.getData().toString());
           //mListItems.addFirst("Added after refresh...");
           MyAdapter adapter=new MyAdapter(fromJson.getData(), getApplicationContext());
           ListView actualListView = mPullRefreshListView.getRefreshableView();
           actualListView.setAdapter(adapter);

           actualListView.setOnItemClickListener(new OnItemClickListener() {

               @Override
               public void onItemClick(AdapterView<?> arg0, View arg1,
                       int arg2, long arg3) {
                   // TODO Auto-generated method stub
                   Intent intent=new Intent(MainActivity.this,DetailsActivity.class);
                   intent.putExtra("list", fromJson.getData().get(arg2));
                   startActivity(intent);
               }
           });
           adapter.notifyDataSetChanged();
            index= index+1;
           // Call onRefreshComplete when the list has been refreshed.
           mPullRefreshListView.onRefreshComplete();
       }
   }

}

DetailsActivity

public class DetailsActivity extends Activity {

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       // TODO Auto-generated method stub
       super.onCreate(savedInstanceState);
       setContentView(R.layout.show_detail);
       Intent intent = getIntent();
       News news=(News) intent.getSerializableExtra("list");
       ImageView imageView=(ImageView) findViewById(R.id.image_show);
       TextView textView=(TextView) findViewById(R.id.text_show);
       textView.setText(news.getNews_title());
       BitmapUtils bitmapUtils=new BitmapUtils(getApplicationContext());
       bitmapUtils.display(imageView, news.getPic_url());
   }

}

Baseadapter

public class MyAdapter extends BaseAdapter {
    List<News> list;
    Context context;
    public MyAdapter(List<News> list, Context context) {
       super();
       this.list = list;
       this.context = context;
    }
   @Override
   public int getCount() {
       // TODO Auto-generated method stub
       return list.size();
   }

   @Override
   public Object getItem(int position) {
       // TODO Auto-generated method stub
       return list.get(position);
   }

   @Override
   public long getItemId(int position) {
       // TODO Auto-generated method stub
       return position;
   }

   @Override
   public View getView(int position, View convertView, ViewGroup parent) {
       // TODO Auto-generated method stub
       ViewHolder viewHolder;
       if(convertView==null){
           viewHolder=new ViewHolder();
           convertView=LayoutInflater.from(context).inflate(R.layout.list_view, null);
           viewHolder.textView=(TextView) convertView.findViewById(R.id.text);
           viewHolder.imageView=(ImageView) convertView.findViewById(R.id.image);
           convertView.setTag(viewHolder);
       }else{
           viewHolder=(ViewHolder) convertView.getTag();
       }
          viewHolder.textView.setText(list.get(position).getNews_title());
          BitmapUtils bitmapUtils=new BitmapUtils(context);
          bitmapUtils.display(viewHolder.imageView,list.get(position).getPic_url());
       return convertView;
   }
    class ViewHolder{
       TextView textView;
       ImageView imageView;
    }
}

分装类

public class List_news {
   List<News> data;

   public List<News> getData() {
       return data;
   }

   public void setData(List<News> data) {
       this.data = data;
   }

}

布局页面main

public class News implements Serializable{
   String news_title;
   String pic_url;
   public String getNews_title() {
       return news_title;
   }
   public void setNews_title(String news_title) {
       this.news_title = news_title;
   }
   public String getPic_url() {
       return pic_url;
   }
   public void setPic_url(String pic_url) {
       this.pic_url = pic_url;
   }

}