Android：下载网络图片

LoadImageThread.java

import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Environment;import android.widget.ImageView;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;public class LoadImageThread extends Thread {    private String url;    private ImageView imageView;    public LoadImageThread(String url, ImageView imageView) {        this.url = url;        this.imageView = imageView;    }    @Override    public void run() {        try {            URL httpUrl = new URL(url);            HttpURLConnection connection = (HttpURLConnection) httpUrl.openConnection();            connection.setConnectTimeout(5000);//超时等待            connection.setRequestMethod("GET");//访问方式            InputStream in = connection.getInputStream();            FileOutputStream out = null;            File downloadFile = null;            String fileName = String.valueOf(System.currentTimeMillis()) + url.substring(url.lastIndexOf("."));//保存名称            //判断ID卡是否存在            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {                File parent = Environment.getExternalStorageDirectory();//获取ID卡目录                downloadFile = new File(parent, fileName);                out = new FileOutputStream(downloadFile);            }            if (out != null) {                //创建缓冲区                byte[] b = new byte[2 * 1024];                int len;                //下载图片到本地                while ((len = in.read(b)) != -1) {                    out.write(b, 0, len);                }                //创建Bitmap                final Bitmap bitmap = BitmapFactory.decodeFile(downloadFile.getAbsolutePath());                imageView.post(new Runnable() {                    @Override                    public void run() {                        imageView.setImageBitmap(bitmap);                    }                });            }        } catch (MalformedURLException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }}

MainActivity.java

import android.app.Activity;import android.os.Bundle;import android.widget.ImageView;public class MainActivity extends Activity {    private ImageView imageView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        imageView = (ImageView) findViewById(R.id.imageView);        new LoadImageThread("http://pic1.sc.chinaz.com/files/pic/pic9/201509/apic15021.jpg"                , imageView).start();       }   }

AndroidManifest.xml

参考：http://www.imooc.com/video/7213

LoadImageThread.java

MainActivity.java

AndroidManifest.xml

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