Convert string to byte array in android

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For eg: String a="12345678abcdefgh";
This string should be converted to a byte array in android...like 0x12 0x34 0x56 0x78 0xab 0xcd 0xef 0xgh...................
pls help urgent..........

Posted 28-Oct-14 4:29am

User1454

Updated 28-Oct-14 4:48am

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Comments

Alan N 28-Oct-14 10:55am

Well, that's going to be tricky! If you could explain what value you mean by 0xgh someone may be able to answer.

User1454 28-Oct-14 11:03am

sir,....actually........ value of "a" should be converted to byte array
byte[] command={0x2D,0x12,0x01,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x02 ,(byte) 0xFF ,(byte) 0xFF ,0x08 ,0x00 ,0x06 ,0x11 ,0x01 ,0x02};

so this value i will be sending using tcp/ip socket....

Dilan Shaminda 28-Oct-14 11:10am

string can be converted to byte array in android by byte[] bytes = a.getBytes(Charsets.UTF_8); what do you mean by 0x12 0x34 0x56 0x78 0xab 0xcd 0xef 0xgh..... ?

User1454 28-Oct-14 11:13am

I need byte array from hex string.................

Dilan Shaminda 28-Oct-14 11:17am

check my answer

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Dilan Shaminda · Accepted Answer · 2014-10-28T05:17:00

Solution 1

From this hex String To Byte Array tutorial

Java

public static byte[] hexStringToByteArray(String s) {
  byte[] b = new byte[s.length() / 2];
  for (int i = 0; i < b.length; i++) {
    int index = i * 2;
    int v = Integer.parseInt(s.substring(index, index + 2), 16);
    b[i] = (byte) v;
  }
  return b;
}

Posted 28-Oct-14 5:17am

Dilan Shaminda

Comments

User1454 28-Oct-14 11:21am

thank u so much thats working ..............and this is what i need..... u saved my time...

Dilan Shaminda 28-Oct-14 11:21am

you are welcome :-)

Convert string to byte array in android

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