Decoding html returned as json response - android

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独厮守ぢ
独厮守ぢ 2021-01-07 02:04

I am getting following encoded html as a json response and has no idea how to decode it to normal html string, which is an achor tag by the way.

x3ca hrefx3d         


        
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  • 2021-01-07 02:48

    This works for me

        public static String convertUTF8Units_version2(String input) throws UnsupportedEncodingException
        {
             return URLDecoder.decode(input.replaceAll("\\\\x", "%"),"UTF-8");
        }
    
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  • 2021-01-07 02:54

    That's not an encoding I've seen before, but it looks like xYZ (where Y and Z are hex digits [0-9a-f]) means "the character whose ascii code is 0xYZ". I'm not sure how the letter x itself would be encoded, so I would recommend trying to find out. But then you can just do a find and replace on the regex x([0-9a-f]{2}), by getting the integer represented by the two hex numbers, and then casting it to a char (or something similar to that).

    Then also, it looks like slashes (and other characters? See if you can find out...) always have a backslash in front of them, so do another find-and-replace for that.

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  • 2021-01-07 02:54

    The term you search for are "UTF8 Code Units". These Code units are basically a backslash, followed by a "x" and a hex ascii code. I wrote a little converter method for you:

    public static String convertUTF8Units(String input) {
        String part = "", output = input;
        for(int i=0;i<=input.length()-4;i++) {
            part = input.substring(i, i+4);
            if(part.startsWith("\\x")) {
                byte[] rawByte = new byte[1];
                rawByte[0] = (byte) (Integer.parseInt(part.substring(2), 16) & 0x000000FF);
                String raw = new String(rawByte);
                output = output.replace(part, raw);
            }
        }
    
        return output;
    }
    

    I know, its a bit frowzy, but it works :)

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  • 2021-01-07 02:54

    Thanks!!

    Take care, in the for the operator must be "<=" else one character can't be decoded.

    for(int i=0;i<=input.length()-4;i++) {..}

    Cheers!

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