android 保存图片到本地相册并及时更新显示

public class SaveBitmapToPhoto {
    /**
     * 保存图片到指定路径
     *
     * @param context
     * @param bitmap   要保存的图片
     * @param fileName 自定义图片名称  getString(R.string.app_name) + "" + System.currentTimeMillis()+".png"
     * @return true 成功 false失败
     */
    public static boolean saveImageToGallery(Context context, Bitmap bitmap, String fileName) {
        // 保存图片至指定路径
        String storePath = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "qrcode";
        File appDir = new File(storePath);
        if (!appDir.exists()) {
            appDir.mkdir();
        }
        File file = new File(appDir, fileName);
        try {
            FileOutputStream fos = new FileOutputStream(file);
            //通过io流的方式来压缩保存图片(80代表压缩20%)
            boolean isSuccess = bitmap.compress(Bitmap.CompressFormat.JPEG, 80, fos);
            fos.flush();
            fos.close();

            //发送广播通知系统图库刷新数据
            Uri uri = Uri.fromFile(file);
            context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, uri));
            if (isSuccess) {
                return true;
            } else {
                return false;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return false;
    }
}