网络请求的图片，在Adapter(适配器)中异步的处理

来源：互联网发布：unity3d 粒子性能优化编辑：程序博客网时间：2024/06/05 07:24

添加权限
<uses-permission android:name="android.permission.INTERNET"/> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.AsyncTask;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.util.List;/** * Created by 唐雪琴 on 2017/11/30. */public class MyAdapter extends BaseAdapter {    private List<User.DataBean.PcFeedFocusBean> list;    private Context context;    private Bitmap bitmap1;    public MyAdapter(List<User.DataBean.PcFeedFocusBean> list, Context context) {        this.list = list;        this.context = context;    }    @Override    public int getCount() {        return list.size();    }    @Override    public Object getItem(int i) {        return list.get(i);    }    @Override    public long getItemId(int i) {        return i;    }    @Override    public View getView(int i, View view, ViewGroup viewGroup) {        ViewHoder hoder;        if (view==null){            view= View.inflate(context, R.layout.itme_layout, null);            hoder=new ViewHoder();            hoder.img=(ImageView)view.findViewById(R.id.img);            hoder.text=(TextView)view.findViewById(R.id.text);            view.setTag(hoder);        }else {            hoder= (ViewHoder) view.getTag();        }        hoder.text.setText(list.get(i).getTitle());        new MyTask(hoder.img).execute("http:"+list.get(i).getImage_url());······················        return view;    }    class MyTask extends AsyncTask<String, Void, Bitmap> {》》》》》》》》》》》》》》》》》》》》》》》》》》private ImageView img;        public MyTask(ImageView img) {            this.img = img;        }        //运行在后台，进行网络请求，子线程        @Override        protected Bitmap doInBackground(String... strings) {//...可变长类型 string....相当于 String[]      Bitmap bitmap=null;            try {                //1.创建URL                URL url = new URL(strings[0]);                //2.打开连接                HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();                //3.设置                urlConnection.setRequestMethod("GET");                urlConnection.setReadTimeout(5000);                urlConnection.setConnectTimeout(5000);                //4.判断响应码                if (urlConnection.getResponseCode() == 200) {                    //5.获取数据                    InputStream inputStream = urlConnection.getInputStream();                    bitmap1 = BitmapFactory.decodeStream(inputStream);                }            } catch (MalformedURLException e) {                e.printStackTrace();            } catch (IOException e) {                e.printStackTrace();            }            return bitmap1;        }        @Override        protected void onPostExecute(Bitmap s) {img.setImageBitmap(s);        }    }》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》    public class ViewHoder{        private ImageView img;        private TextView text;    }}

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