android用ImageView显示网络图片

1、权限配置

<!-- 访问internet权限 -->

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

2、 从网络获取图片

package cn.jgw.service;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import cn.jgw.utils.StreamTool;

public class ImageService {
    /**
     * 获取网络图片的数据
     * @param path 网络图片路径
     * @return
     */
    public static byte[] getImage(String path) throws Exception{
        URL url = new URL(path);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();//基于HTTP协议连接对象
        conn.setConnectTimeout(5000);
        conn.setRequestMethod("GET");
        if(conn.getResponseCode() == 200){
            InputStream inStream = conn.getInputStream();
            return StreamTool.read(inStream);
        }
        return null;
    }
}

 

package cn.jgw.utils;

import java.io.ByteArrayOutputStream;

import java.io.InputStream;

public class StreamTool {

/**

* 读取流中的数据

* @param inStream

* @return

* @throws Exception

*/

public static byte[] read(InputStream inStream) throws Exception{

ByteArrayOutputStream outStream = new ByteArrayOutputStream();

byte[] buffer = new byte[1024];

int len = 0;

while( (len = inStream.read(buffer)) != -1){

outStream.write(buffer, 0, len);

}

inStream.close();

return outStream.toByteArray();

}

}

 

 3、在ImageView中显示图片

try{
                byte[] data = ImageService.getImage(path);
                Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
                imageView.setImageBitmap(bitmap);//显示图片
            }catch (Exception e) {
                e.printStackTrace();
                Toast.makeText(getApplicationContext(), R.string.error, 1).show();

}