卜若的代码笔记-android开发的108个技巧-第11个技巧：Bitmap转base64

    public String bitmaptoString(Bitmap bitmap) {
        // 将Bitmap转换成字符串

        String string = null;

        ByteArrayOutputStream bStream = new ByteArrayOutputStream();

        bitmap.compress(Bitmap.CompressFormat.PNG, 100, bStream);

        byte[] bytes = bStream.toByteArray();

        string = Base64.encodeToString(bytes, Base64.DEFAULT);

        return string;

    }