listView加载

布局：

1.

<?xml version="1.0" encoding="utf-8"?>
<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"
   >


    <ListView
        android:id="@+id/list_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
       />
</RelativeLayout>

2.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    >
    <ImageView
        android:id="@+id/image_view"
        android:layout_width="100dp"
        android:layout_height="100dp" />
    <TextView
        android:id="@+id/text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />


</LinearLayout>

代码：

package zhoukao.guolei20170921;


import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ListView;


import com.google.gson.Gson;


import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;


public class MainActivity extends AppCompatActivity {


    private ListView listView;
    private List<DataDataBean.NewslistBean> list;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = (ListView) findViewById(R.id.list_view);
        
        getData();
        
    }


    private void getData() {
        AsyncTask<Void,Void,String> asyncTask=new AsyncTask<Void, Void, String>() {
            @Override
            protected String doInBackground(Void... voids) {
                String path="https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10";


                try {
                    URL url=new URL(path);


                    HttpURLConnection connection= (HttpURLConnection) url.openConnection();


                    connection.setRequestMethod("GET");
                    connection.setConnectTimeout(5000);
                    connection.setReadTimeout(5000);


                    int responseCode = connection.getResponseCode();
                    if (responseCode==200){
                        InputStream inputStream=connection.getInputStream();
                        String json=streamToString(inputStream,"utf-8");
                        return json;


                    }




                } catch (Exception e) {
                    e.printStackTrace();
                }




                return "";
            }


            @Override
            protected void onPostExecute(String s) {
                Gson gson=new Gson();
                list = gson.fromJson(s,DataDataBean.class).getNewslist();
                MyAdapter myAdapter=new MyAdapter(MainActivity.this,list);
                listView.setAdapter(myAdapter);






            }
        };
        asyncTask.execute();
    }


    private String streamToString(InputStream inputStream, String charset) {
        try {


            InputStreamReader inputStreamReader=new InputStreamReader(inputStream,charset);
            BufferedReader bufferedReader=new BufferedReader(inputStreamReader);
            StringBuilder builder=new StringBuilder();
            String s=null;
            while ((s=bufferedReader.readLine())!=null){
                builder.append(s);
            }
            bufferedReader.close();


            return builder.toString();






        } catch (Exception e) {
            e.printStackTrace();
        }




        return null;
    }




}

适配器：

package zhoukao.guolei20170921;


import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;


import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;


import java.util.List;


/**
 * Created by Lenovo on 2017/9/21.
 */
public class MyAdapter extends BaseAdapter{
    Context context;
    List<DataDataBean.NewslistBean> list;


    public MyAdapter(Context context, List<DataDataBean.NewslistBean> list) {
        this.context=context;
        this.list=list;


        ImageLoader.getInstance().init(ImageLoaderConfiguration.createDefault(context));




    }


    @Override
    public int getCount() {
        return list.size();
    }


    @Override
    public Object getItem(int position) {
        return list.get(position);
    }


    @Override
    public long getItemId(int position) {
        return position;
    }


    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;


        if (convertView==null){
            convertView=View.inflate(context,R.layout.item_layout,null);


            holder=new ViewHolder();


            holder.imageView= (ImageView) convertView.findViewById(R.id.image_view);
            holder.textView= (TextView) convertView.findViewById(R.id.text_view);


            convertView.setTag(holder);


        }else{
           holder= (ViewHolder) convertView.getTag();
        }
        holder.textView.setText(list.get(position).getTitle());
        ImageLoader.getInstance().displayImage(list.get(position).getPicUrl(),holder.imageView);








        return convertView;
    }
    class ViewHolder{
        ImageView imageView;
        TextView textView;
    }
}