I have converted stringbuffer to strings but how to convert string to unicode int?

Question

I can see emojis if I enter unicode directly and convert it to String with a method like:

int intUnicode = 0x1F601;

public String getEmojiByUnicode(int unicode) {
    return new String(Character.toChars(unicode));
}

But I just can't wrap my head around how to convert when the unicode value is a String like:

String strUnicode = "0xf601";

How to covert it to an Integer like I did it directly. When I try to use Integer.parseInt(strUnicode) compiler throws an error every time.

InputStream is = assetManager.open("emoji_unicode.txt");
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
if (is != null){
    try {
        while ((data = reader.readLine()) != null){
            sbuffer.append(data + "\n");
            String j = sbuffer.toString().trim();
            int k = Integer.parseInt(j,16);
            String l = getEmojiByUnicode(k);
            emoArray.add(l);
        }
        btn.setText(emoArray.get(5));
        is.close();
    }catch (IOException e){
        e.printStackTrace();
    }
}

It's not very hard, I know I'm very close but still it won't get to me. Any help would be very appreciated. Regard

Your unicode string that you're starting with isn't the same as the one you generate in your first example. You should look at the UTF-16 encoding, and see how it applies to code points in the range you're working with. Your compiler is complaining because the string you're giving it isn't valid UTF-16. — Jules
– Jules, Commented Dec 9, 2017 at 19:02
Possible duplicate of Parsing a Hexadecimal String to an Integer throws a NumberFormatException? — Remy Lebeau
– Remy Lebeau, Commented Dec 13, 2017 at 2:58

MyStackRunnethOver · Accepted Answer · 2017-12-09 19:05:30Z

0

You're attempting to parse a hex string (unicode "encodings" are hexadecimal numbers), and Integer.parseInt() has some odd limits for doing so. Take a look at this answer:

Parsing a Hexadecimal String to an Integer throws a NumberFormatException?

answered Dec 9, 2017 at 19:05

MyStackRunnethOver

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