final byte[] texttoprint = new byte[]{0x1b, 0x40, 0x1b,0x74,0x0D,(byte) 0x91,(byte) 0x92,(byte) 0x93,(byte) 0x94,(byte) 0x95,(byte) 0x96,(byte) 0x97,(byte) 0x98,(byte) 0x99,0x0A,0x0A,0x0A,0x0A,0x0A};

0x1b , 0x40

for (int index = 0; index < texttoprint.length;){
Log.i("myactivity", String.format("%20x", texttoprint[index]));
}

Log.i("myactivity", Arrays.toString(texttoprint));

for (int index = 0; index < texttoprint.length; index++){
 Log.i("myactivity", String.format("0x%20x", texttoprint[index]));
}

for (byte b: texttoprint){
 Log.i("myactivity", String.format("0x%20x", b));
}