ListView和SimPleteAdapter 把新闻数据绑定到ListView

ListView和SimPleteAdapter 把新闻数据绑定到ListView

//布局界面有2个xml文件 1 -- ListView -- activity_main.xml
                        2 -- 新闻数据内容 -- item_activity.xml

//记得添加联网权限

1、activity_main.xml文件 布局

代码

<LinearLayout 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:orientation="vertical"
    >

    <ListView
        android:id="@+id/listview"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </ListView>

</LinearLayout>

---------------

item_activity.xml文件 布局

代码

<LinearLayout 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:orientation="vertical" >

    <TextView
        android:id="@+id/subject"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="30sp"/>
   
     <TextView
        android:id="@+id/summary"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="17sp"/>
    
      <TextView
        android:id="@+id/changed"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="10sp"/>

</LinearLayout>
----------------------

2、MainActivity 类

代码

public class MainActivity extends Activity {
private ListView listview;
private SimpleAdapter adapter;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  this.listview = (ListView) this.findViewById(R.id.listview);
  
  String url = "http://litchiapi.jstv.com/api/GetFeeds?column=0&PageSize=20&pageIndex=1&val=100511D3BE5301280E0992C73A9DEC41";

  new MyAsyncTask().execute(url);
 }
 
//启动工具类 进行联网下载数据操作
 class MyAsyncTask extends AsyncTask<String, Void, byte[]>{

  @Override
  protected byte[] doInBackground(String... params) {
   String url = params[0];
   HttpGet get = new HttpGet(url);
   HttpClient client = new DefaultHttpClient();
   try {
    HttpResponse response = client.execute(get);
    if(response.getStatusLine().getStatusCode() == 200){
     return EntityUtils.toByteArray(response.getEntity());
    }
   } catch (Exception e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
   
   return null;
  }
  @Override
  protected void onPostExecute(byte[] result) {
   if(result != null){
    
//把下载好的数据用json解析 把需要的数据解析出来 方法 -- jsonObject
    List<Map<String, Object>> data = jsonObject(new String(result));
    //把需要的数据解析好 返回来 然后 装在一个集合里
//把装在集合里的数据丢到自定义的适配器里
    adapter = new SimpleAdapter(MainActivity.this, data , R.layout.item_activity,
    new String[]{"subject","summary","changed"}, new int[]{R.id.subject,R.id.summary,R.id.changed});
   //把适配器绑定到ListView 
                                listview.setAdapter(adapter);
    
   }
  }
  private List<Map<String, Object>> jsonObject(String string) {
   List<Map<String, Object>> data_list = new ArrayList<Map<String, Object>>();
   try {
    JSONObject obj = new JSONObject(string);
    JSONObject obj_paramz = obj.getJSONObject("paramz");
    JSONArray array_feeds = obj_paramz.getJSONArray("feeds");
    for(int i = 0;i<array_feeds.length();i++){
     JSONObject object = array_feeds.getJSONObject(i);
     JSONObject obj_data = object.getJSONObject("data");
     Map<String,Object> map = new HashMap<String, Object>();
     map.put("subject", obj_data.getString("subject"));
     map.put("summary", obj_data.getString("summary"));
     map.put("changed", obj_data.getString("changed"));
     
     data_list.add(map);
    }
   } catch (Exception e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
   
   return data_list;
  }
 }
}