Android development method to load network pictures and download them to local SdCard

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public class MainActivity extends Activity {
  private ImageView mImageView;
  private String imgPath="/2007-11-09/200711912453162_2.jpg";
  private File cache;//Cache path  Handler handler=new Handler(new () {
    @Override
    public boolean handleMessage(Message msg) {
      //show      Bitmap b=(Bitmap);
      (b);
      //Save to local      File imgFile=new File(cache,"");
      try {
        BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream(imgFile));
        (,80,bos);
        ();
        ();
      } catch (Exception e) {
        // TODO Auto-generated catch block
        ();
      }
      return false;
    }
  });
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    (savedInstanceState);
    setContentView(.activity_main);
    mImageView=(ImageView)findViewById();
    //Create cache path    //() Get the root path of the mobile phone memory card    cache=new File((),"Test");
    if(!()){
      ();
    }
    //Time-consuming operations must be placed in the child thread operation    //Open the child thread to get the input stream    new Thread(new Runnable() {
      @Override
      public void run() {
        HttpURLConnection conn=null;
        InputStream is=null;
        try {
          URL url=new URL(imgPath);
          //Open the connection          conn=(HttpURLConnection) ();
          //Set connection timeout          (5000);
          //Set request method          ("GET");
          //();
          if(()==200){
            is=();
            Bitmap b=(is);
            //Convert the input stream into bitmap format and send it to the main thread in msg form            Message msg=new Message();
            =b;
            (msg);
          }
        } catch (Exception e) {
          ();
        }finally{
          try {
          //Remember to close after use            ();
            ();
          } catch (IOException e) {
            ();
          }
        }
      }
    }).start();
  }
}

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