How to convert Byte to String in Android USB Host?

Question

I have connected using pl2303 cable and trying to convert string from this method

  private void updateReceivedData(byte[] data) {
      String tmpString=HexDump.dumpHexString(data);
      // I've Tried several methods like 
      String dataString=new String(data);
      String dataString=new String(data,""UTF-8"");
      String dataString=Byte.decode(tmpString);

but none has helped. Kindly reply me.

Source : Method Link

Target Method[updateReceivedData(byte[] data)]

Project Link

Screenshot Link

have you got the method **System.Text.Encoding.UTF8.GetChars(byte[] Message)** available? Also, is the data definitely coming in as decimal (or hex data)? — jbutler483, Aug 28 '14 at 12:37
change the **byte[] Message** from above to the name of your **byte[] array** — jbutler483, Sep 02 '14 at 09:29
@jbutler483 Error: Text cannot be resolved or is not a field. — Pandian, Sep 02 '14 at 09:45
@jbutler483 yes... I'm afraid it's not available in java.lang.system package. — Pandian, Sep 02 '14 at 09:55

jbutler483 · Answer 1 · 2014-09-02T10:02:39.767

I am currently using UTF8 encoding between string and byte[] (and vice versa).

This is done [in c#, but you should get the general idea :)] using;

using System.Text;    


public static String changeValue(byte[] msg)
{
String myMsg = "";
char[] msgAsChars = System.Text.Encoding.UTF8.GetChars(byte[] msg); 
//now should be a char array of your values

  for(int i=0;i<msgAsChars.Length;i++) 
  {
   //loop through your char array and add to string
    myMsg +=msgAsChars[i];
  }

return myMsg;
}

Might be a bit messy, but you should be able to get the idea.

EDIT

In java; decoding a byte array should be similar to:

String decoded = new String(bytes, "UTF-8");

Or something like:

to convert directly to String, you can always use
`String str = new String(byte[] byteArray);`

EDIT 2

public class Main {

    /*
     * This method converts a byte array to a String object.
     */

    public void convertByteArrayToString() {

        byte[] byteArray = new byte[] {87, 79, 87, 46, 46, 46};

        String value = new String(byteArray);

        System.out.println(value);
    }


    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        new Main().convertByteArrayToString();
    }
}

that looks like you are using the wrong baud rate (default is 9600)? — jbutler483, Sep 02 '14 at 10:43
how are you monitoring your port? (to see these values coming in)? — jbutler483, Sep 02 '14 at 16:36
My theory would be that there could be an error in how it's being 'saved' to text file (would a serial port monitor not be of better use?) — jbutler483, Sep 03 '14 at 07:55

score 1 · Answer 2 · answered Sep 08 '14 at 10:43

First don't hard code your character Set

if your want to convert string to binary array, there is a special class know as Base64 from Apache Which is Open Source.

Add the following jar to your libs. commons-codec-1.2.jar

try this:

byte[] decodeByteArray  = Base64.decodeBase64(data); //data is Source Byte Array from updateReceivedData method
String dataString  = new String(decodeByteArray);

score 0 · Answer 3 · answered Jul 16 '18 at 11:40

Did you check your baud rate ? in sPort.setParameters(115200, 8, UsbSerialPort.STOPBITS_1, UsbSerialPort.PARITY_NONE);

I was using the wrong baud rate and i changed from 115200 to 9600, then, in the updateReceivedData method, i used, String s = new String(data);to convert the byte data into String.

How to convert Byte to String in Android USB Host?

3 Answers3