java代码如何将一个url的图片下载--并转换为Bitmap存储在本地呢?

Url图片转Bitmap的实现思路:
    1.借助HttpURLConnection下载网络图片对象为流
	2.将inputStream流转换为Bitmap对象

public static Bitmap returnBitMap(final String src){
 try {
	URL url = new URL(src);
	HttpURLConnection connection = (HttpURLConnection) url.openConnection();
	connection.setDoInput(true);
	connection.connect();
	InputStream input = connection.getInputStream();
	Bitmap myBitmap = BitmapFactory.decodeStream(input);
	return myBitmap;
 }  catch (IOException e) {
	return null;
 }
}