UUID.java

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import android.content.Context;
import android.net.wifi.WifiManager;
import android.os.Build;
import android.provider.Settings.Secure;
import android.telephony.TelephonyManager;

public class UDID {

	
	public UDID() {
		
	}
	
	public String getUDID(Context c) {

		// Get some of the hardware information
		String buildParams = Build.BOARD + Build.BRAND + Build.CPU_ABI
				+ Build.DEVICE + Build.DISPLAY + Build.FINGERPRINT + Build.HOST
				+ Build.ID + Build.MANUFACTURER + Build.MODEL + Build.PRODUCT
				+ Build.TAGS + Build.TYPE + Build.USER;

		// Requires READ_PHONE_STATE
		TelephonyManager tm = (TelephonyManager) c
				.getSystemService(Context.TELEPHONY_SERVICE);

		// gets the imei (GSM) or MEID/ESN (CDMA)
		String imei = tm.getDeviceId();

		// gets the android-assigned id
		String androidId = Secure.getString(c.getContentResolver(),
				Secure.ANDROID_ID);

		// requires ACCESS_WIFI_STATE
		WifiManager wm = (WifiManager) c.getSystemService(Context.WIFI_SERVICE);

		// gets the MAC address
		String mac = wm.getConnectionInfo().getMacAddress();

		// concatenate the string
		String fullHash = buildParams + imei + androidId + mac;

		return md5(fullHash);

	}

	public String md5(String toConvert) {

		String retVal = "";

		MessageDigest algorithm;
		try {

			algorithm = MessageDigest.getInstance("MD5");
			algorithm.reset();
			algorithm.update(toConvert.getBytes());
			byte messageDigest[] = algorithm.digest();

			StringBuffer hexString = new StringBuffer();
			for (int i = 0; i < messageDigest.length; i++) {
				hexString.append(Integer.toHexString(0xFF & messageDigest[i]));
			}

			retVal = hexString + "";

		} catch (NoSuchAlgorithmException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		return retVal;
	}

}