CODEWITHSUNDEEP
androidjsonstringbyte
lhbortho
lhbortho

Reputation: 177

Transform byte format string to byte array android

I'm receiving a JSON object that has a byte array in it in a string format because of limitations of my system. It's only for testing something.

I get the string in question "[ 1, 2, 3, 4]" for example in android and want to transform it so I end up with byte[] data = [ 1, 2, 3, 4] .

Using getBytes obviously doesn't return what I'm looking for and I'm kinda clueless as to what can be done here. Help would be greatly appreciated!

Edit : I just parsed the string to get the each integer in an array of ints. Is there a way to put that into a byte array easily?

Thanks

Upvotes: 0

Views: 169

Answers (1)

Dave Friedman
Dave Friedman

Reputation: 59

Try this:

private static byte[] doConvert(String inStr) {
    String opStr = inStr.substring(1);
    opStr = opStr.substring(0, opStr.length()-1);
    int val;
    String[] arr = opStr.split("[,]");
    byte[] retVal = new byte[arr.length];
    for (int i=0; i<arr.length; i++) {
        opStr = arr[i].trim();
        try {
            val = Integer.parseInt(opStr);
        } catch (Exception e) {
            System.out.println("bad input at item #"+i+": "+opStr);
            return null;
        }
        if (val > 255) {
            System.out.println("bad input value at item #"+i+": "+val+" > 255");
            return null;                
        }
        retVal[i] = (byte) val;
    }
    return retVal;
}

Upvotes: 2

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