Byte array -> String -> Byte array

Question

I'm trying to convert byte[] to String and than String to byte[]. I retrive not the same byte[] array.

byte[] bArray1 = myFunction();
System.out.println("array1 = " + bArray1.toString());
String str = new String(bArray1);
byte[] bArray2 = str.getBytes();
System.out.println("array2 = " + bArray2.toString());

After executing i get:

array1 = [-15, -87, -44, 61, -115, 23, -3, 75, 99, 36, -49, 21, -41, -63, 100, -49]
array2 = [-17, -65, -67, -17, -65, -67, 61, -17, -65, -67, 23, -17, -65, -67, 75, 99, 36, -17, -65, -67, 21, -17, -65, -67, -17, -65, -67, 100, -17, -65, -67, -17, -65, -67]

Why does it happen and how can i get the same array?

This work on my computer, but not on my android:

byte[] bArray1 = myFunction();
String str = Base64.encodeToString(bArray1, Base64.DEFAULT);
byte[] bArray2 = Base64.decode(str, Base64.DEFAULT);

I have seen the article Hex-encoded String to Byte Array. But android have not class Hex.

Edited

I'm sorry, i was wrong that Base64 is not working.

This was tested at android 2.3.3, 2.3.4, 4.2, 4.3 and it works:

byte[] bArray1 = myFunction();
String str = Base64.encodeToString(bArray1, Base64.DEFAULT);
byte[] bArray2 = Base64.decode(str, Base64.DEFAULT);

Building on tom's comment, are you dealing with actual ASCII/printable data in the byte[] returned from myFunction() ? And what are you trying to do by the conversion ? — K5 User
– K5 User, Commented Oct 15, 2013 at 18:09

Parth Akbari · Accepted Answer · 2014-12-31 06:09:27Z

0

Example this function might be help you

Converting string to byte array

public static byte[] convertStirngToByteArray(String s)
{
byte[] byteArray = null;
if(s!=null)
 {
 if(s.length()>0)
 {
try
 {
  byteArray = s.getBytes();
 } catch (Exception e)
{
 e.printStackTrace();
}
}
}
return byteArray;
}

Converting byte array to string

public static String convertByteArrayToString(byte[] byteArray)
{
String s = null;
if(byteArray!=null)
{
 if(byteArray.length>0)
{
 try
 {
  s = new String(byteArray,"UTF-8");
 }
 catch (Exception e)
 {
 e.printStackTrace();
 }
}
}
return s;
}

answered Dec 31, 2014 at 6:09

Parth Akbari

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Comments

Codeman · Accepted Answer · 2021-10-10 01:01:59Z

0

You should be able to solve this by using a ByteBuffer and a CharSet.

Android uses UTF-8 encoding by default (You can check this with Charset.defaultCharset()), so you need to specify that that is how you want to encode and decode your strings.

ByteBuffer buff = Charset.defaultCharset().encode(myString);
byte[] bytes = buff.array();
CharBuffer charBuff = Charset.defaultCharset().decode(bytes);
String original = charBuff.toString();

This should work.

edited Oct 10, 2021 at 1:01

answered Oct 15, 2013 at 22:36

Codeman

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