原生android-为h5提供下载图片

接收前端传给的url ：

  /**
     *
     * @param imgPath
     * @param context
     */
    public void loadImg(final String imgPath, final Context context) {
        T.showShort("开始下载");
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    BitmapDrawable drawable = (BitmapDrawable) Glide.with(context)
                            .load(imgPath)
                            .submit(Target.SIZE_ORIGINAL, Target.SIZE_ORIGINAL)
                            .get();
                    Bitmap bitmap = drawable.getBitmap();
                    String name = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date()) + ".jpg";
                    File path = new File(Environment.getExternalStorageDirectory() + "/haha", "images");
                    File output = new File(path, name);
                    String imagePath = output.getPath();
                    if (!output.getParentFile().exists()) output.getParentFile().mkdirs();
                  
                    File f = new File(imagePath);
                    OutputStream os = new FileOutputStream(f);
                    bitmap.compress(Bitmap.CompressFormat.PNG, 100, os);
                    os.close();
                    Uri uri = Uri.fromFile(f);
                    context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, uri));
                    ((Activity) context).runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            T.showShort("下载成功，请到相册中查看");
                        }
                    });
                } catch (Exception e) {

                }
            }
        }).start();
    }