从网络上获取ImageLoader并且ListView上展示

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从网络上获取ImageLoader并且ListView上展示

原创 2017年08月10日 16:01:45

首先要在清单文件里添加网络权限

<uses-permission android:name="android.permission.INTERNET"/>

引入.MyApplication

<application
android:name="com...imageloaderlistview.MyApplication"

导入一个依赖

compile files('libs/universal-image-loader-1.9.3-with-sources.jar')

MyApplication 类

public class MyApplication extends Application{

   @Override
   public void onCreate() {
       ImageLoaderConfiguration configuration=ImageLoaderConfiguration.createDefault(this);
       ImageLoader.getInstance().init(configuration);
       super.onCreate();
   }
}

MainActivity 类

public class MainActivity extends Activity {

   private News json;
   List<NewsData> list;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       //Listview控件
       final ListView lv = (ListView) findViewById(R.id.lv);
       //启动一个异步
       new AsyncTask<String, String, String>() {

           @Override
           protected String doInBackground(String... strings) {
               getData();
               return null;
           }

           @Override
           protected void onPostExecute(String result) {
               MyAdapter adapter = new MyAdapter();
               lv.setAdapter(adapter);
               super.onPostExecute(result);
           }

       }.execute();
   }

   protected void getData() {
       try {
           URL url = new URL( "https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10");
           HttpURLConnection conn = (HttpURLConnection) url.openConnection();
           int code = conn.getResponseCode();
           if (code == 200) {
               Log.i("adsafas", "============");
               Gson gson = new Gson();
               json = gson.fromJson(new InputStreamReader(conn.getInputStream()), News.class);
               list = json.getNewslist();
           }
       } catch (Exception e) {
           e.printStackTrace();
       }
   }

   class MyAdapter extends BaseAdapter {

       @Override
       public int getCount() {
           // TODO Auto-generated method stub
           return list.size();
       }

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

       @Override
       public long getItemId(int position) {
           // TODO Auto-generated method stub
           return 0;
       }

       @Override
       public View getView(int position, View convertView, ViewGroup parent) {
           ViewHolder holder;
           if (convertView==null) {
               convertView=View.inflate(MainActivity.this, R.layout.list_item,null);
               holder=new ViewHolder();
               holder.tv=(TextView) convertView.findViewById(R.id.tv);
               holder.tv1 = (TextView) convertView.findViewById(R.id.tv1);
               holder.tv2 = (TextView) convertView.findViewById(R.id.tv2);
               holder.tv3 = (TextView) convertView.findViewById(R.id.tv3);
               holder.iv = (ImageView) convertView.findViewById(R.id.iv);
               convertView.setTag(holder);
           }else {
               holder=(ViewHolder) convertView.getTag();
           }
           holder.tv.setText(list.get(position).getCtime());
           holder.tv1.setText(list.get(position).getDescription());
           holder.tv2.setText(list.get(position).getTitle());
           holder.tv3.setText(list.get(position).getUrl());

下面这行代码就是从网络上获取并且展示出来

            ImageLoader.getInstance().displayImage(list.get(position).getPicUrl(), holder.iv);
           return convertView;
       }

   }
   public static class ViewHolder{
       TextView tv,tv1,tv2,tv3;
       ImageView iv;
   }
}

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