Android 加载网络图片并下载至本地SdCard

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package com.example.myimagedemo;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.os.Environment;import android.os.Handler;import android.os.Message;import android.widget.ImageView;public class MainActivity extends Activity {    private ImageView mImageView;    private String imgPath="http://pic.nipic.com/2007-11-09/200711912453162_2.jpg";    private File cache;//缓存路径    Handler handler=new Handler(new Handler.Callback() {        @Override        public boolean handleMessage(Message msg) {            //显示            Bitmap b=(Bitmap)msg.obj;            mImageView.setImageBitmap(b);            //保存至本地            File imgFile=new File(cache,"woca.jpg");            try {                BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream(imgFile));                b.compress(Bitmap.CompressFormat.JPEG,80,bos);                bos.flush();                bos.close();            } catch (Exception e) {                // TODO Auto-generated catch block                e.printStackTrace();            }            return false;        }    });    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);             mImageView=(ImageView)findViewById(R.id.mImageView);        //创建缓存路径        //Environment.getExternalStorageDirectory()获取手机内存卡根路径        cache=new File(Environment.getExternalStorageDirectory(),"Test");        if(!cache.exists()){            cache.mkdirs();        }        //耗时操作都要放在子线程操作        //开启子线程获取输入流        new Thread(new Runnable() {            @Override            public void run() {                HttpURLConnection conn=null;                InputStream is=null;                try {                    URL url=new URL(imgPath);                    //开启连接                    conn=(HttpURLConnection) url.openConnection();                    //设置连接超时                    conn.setConnectTimeout(5000);                    //设置请求方式                    conn.setRequestMethod("GET");                    //conn.connect();                    if(conn.getResponseCode()==200){                        is=conn.getInputStream();                        Bitmap b=BitmapFactory.decodeStream(is);                        //把输入流转化成bitmap格式，以msg形式发送至主线程                        Message msg=new Message();                        msg.obj=b;                        handler.sendMessage(msg);                    }                       } catch (Exception e) {                    e.printStackTrace();                }finally{                    try {                    //用完记得关闭                        is.close();                         conn.disconnect();                    } catch (IOException e) {                        e.printStackTrace();                    }                }            }        }).start();    }}//记得在AndroidMenifest.xml文件加入这三个权限<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>    <uses-permission android:name="android.permission.INTERNET"/>    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
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