JAVA , String to byte array byte size

Question

I've got problem with converting byte array to string and back :) I get byte array from api which is 10 bytes long. When I convert it to String i"m getting String with 20 chars for example "12345678901234567890" so it looks like there are 2 chars on one byte. However when I try to send it back with simply getText() from editText :

String namespace = mNamespaceTv.getText().toString();

byte array created from that string is 20 bytes long, so one char to one byte. I need to send it back again as 10 byte array. Why it happened and how can I solve this ?

Very unclear what you're actually asking. How can you encode 20 bytes in 10 bytes? (Short of compressing it) — Andy Turner
– Andy Turner, Commented Dec 7, 2016 at 11:06
@AndyTurner I don't want to encode anything. Just try to understand what happened. — Beesz
– Beesz, Commented Dec 7, 2016 at 11:10
I suspect you represent the byte as Hex, In Hex, one byte will usually be represented by 2 "digits" 0-F for example "8F" => 1 byte = 2 chars ... Each of which will be represented by 1 byte in UTF-8 or ASCII. — Fildor
– Fildor, Commented Dec 7, 2016 at 11:10
"I don't want to encode anything" - I guess you did accidentally. — Fildor
– Fildor, Commented Dec 7, 2016 at 11:15

Davide Lorenzo MARINO · Accepted Answer · 2016-12-07 11:29:05Z

2

It is not really clear what you are asking, but consider that the size of the byte array generated from a String depends from the Charset used.

For example:

"ABC".getBytes("UTF-16")   --> array of size 8
"ABC".getBytes("UTF-8")    --> array of size 3
"ABC".getBytes("US-ASCII") --> array of size 3

answered Dec 7, 2016 at 11:29

Davide Lorenzo MARINO

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Aimee Borda · Accepted Answer · 2016-12-07 11:26:11Z

0

If it is a byte[] use new String(mNamespaceTv.getText()) rather than toString()

answered Dec 7, 2016 at 11:26

Aimee Borda

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