CODEWITHSUNDEEP
javaandroid
Singee
Singee

Reputation: 523

How to pass Hex values to a string - Android

I need to create a String from hex values I'm providing.

For example, instead of assigning like this: 

String message = "123";

I want to assign like this:

String message = 0x31, 0x32, 0x33;

Is that possible?

Upvotes: 6

Views: 2176

Answers (2)

C0D3LIC1OU5
C0D3LIC1OU5

Reputation: 8680

If you have a String representation of a Hex value (say, you are getting the value from the server, in a JSON object), you might need to make sure to treat it as a Hex value. You can import import org.apache.commons.codec.binary.Hex; and then do this:

String stringHex = "a37e7391ebbc939a8489788d93015914eeee423132e2516711e81d53777067ee"
String yourString = new String(Hex.decodeHex(stringHex.toCharArray()), StandardCharsets.UTF_8);

Just wanted to add to the above answer.

Upvotes: 0

George Mulligan
George Mulligan

Reputation: 11913

You should probably also specify the character set you are using but this will do it:

String message = new String(new byte[] {0x31, 0x32, 0x33});
System.out.println(message); // prints 123.

If you did want to specify the character set it is just another parameter to the String constructor. The following example will work if targeting Android API 19+:

String message = new String(new byte[] {0x31, 0x32, 0x33}, StandardCharsets.UTF_8);

Upvotes: 7

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