apache commons-codec class Hex for Android (just put it into your project)

Hex.java

```
Just put it into your code and import like this
  import android.org.apache.commons.codec.binary.Hex;

```


package android.org.apache.commons.codec.binary;

import java.nio.charset.Charset;

public class Hex {
    public static final Charset DEFAULT_CHARSET;
    private static final char[] DIGITS_LOWER;
    private static final char[] DIGITS_UPPER;
    static {
        DEFAULT_CHARSET = Charset.forName("UTF-8");
        DIGITS_LOWER = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
        DIGITS_UPPER = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
    }

    public static String encodeHexString(byte[] data) {
        return new String(encodeHex(data));
    }

    public static char[] encodeHex(byte[] data) {
        return encodeHex(data, true);
    }

    public static char[] encodeHex(byte[] data, boolean toLowerCase) {
        return encodeHex(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
    }

    protected static char[] encodeHex(byte[] data, char[] toDigits) {
        int l = data.length;
        char[] out = new char[l << 1];
        int i = 0;

        for (int var5 = 0; i < l; ++i) {
            out[var5++] = toDigits[(240 & data[i]) >>> 4];
            out[var5++] = toDigits[15 & data[i]];
        }

        return out;
    }

}