如何从android url下载图片

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

public class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
    protected Bitmap doInBackground(String... urls) {
        String imageUrl = urls[0];
        Bitmap bitmap = null;
        try {
            URL url = new URL(imageUrl);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setDoInput(true);
            connection.connect();
            InputStream input = connection.getInputStream();
            bitmap = BitmapFactory.decodeStream(input);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return bitmap;
    }

    protected void onPostExecute(Bitmap result) {
        // 下载完成后的操作，例如将图片显示在ImageView中
        imageView.setImageBitmap(result);
    }
}

String imageUrl = "http://example.com/image.jpg";
DownloadImageTask downloadTask = new DownloadImageTask();
downloadTask.execute(imageUrl);