Converting int to byte in Android

Question

Actually I need to transfer the integer value along with the bitmap via bluetooth.. Now my problem is I need to transfer the in

Answer 1

If you're completely sure, that your int variable contains a byte value [-128; 127] then it should be as simple as:

int i = 100; // your int variable
byte b = (byte) i;

Answer 2

A single byte (8 bits) can only contain 2^8 unsigned integers, i.e [0, 255]. For signed you loose the first bit and the range becomes [-128, 127]. If your integer fits then a simple cast should work.

Answer 3

for 0-255 numbers.

int i = 200; // your int variable
byte b = (byte)(i & 0xFF);

Answer 4

What about this?

public static byte[] intToByteArray(int a)
{
    byte[] ret = new byte[4];
    ret[3] = (byte) (a & 0xFF);   
    ret[2] = (byte) ((a >> 8) & 0xFF);   
    ret[1] = (byte) ((a >> 16) & 0xFF);   
    ret[0] = (byte) ((a >> 24) & 0xFF);
    return ret;
}

and

public static int byteArrayToInt(byte[] b)
{
    return (b[3] & 0xFF) + ((b[2] & 0xFF) << 8) + ((b[1] & 0xFF) << 16) + ((b[0] & 0xFF) << 24);
}