UUID Android

import java.util.Arrays;

import android.content.Context;
import android.provider.Settings;
import android.telephony.TelephonyManager;

public class UniqueID {
  public static String getDeviceId(Context context) {
    String id = getUniqueID(context);
    if (id == null)
      id = Settings.Secure.getString(context.getContentResolver(), Settings.Secure.ANDROID_ID);
    return id;
  }

  private static String getUniqueID(Context context) {

    String telephonyDeviceId = "NoTelephonyId";
    String androidDeviceId = "NoAndroidId";

    // get telephony id
    try {
      final TelephonyManager tm =
          (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
      telephonyDeviceId = tm.getDeviceId();
      if (telephonyDeviceId == null) {
        telephonyDeviceId = "NoTelephonyId";
      }
    } catch (Exception e) {

    }

    // get internal android device id
    try {
      androidDeviceId =
          android.provider.Settings.Secure.getString(context.getContentResolver(),
              android.provider.Settings.Secure.ANDROID_ID);
      if (androidDeviceId == null) {
        androidDeviceId = "NoAndroidId";
      }
    } catch (Exception e) {

    }

    // build up the uuid
    try {
      String id =
          getStringIntegerHexBlocks(androidDeviceId.hashCode()) + "-"
              + getStringIntegerHexBlocks(telephonyDeviceId.hashCode());

      return id;
    } catch (Exception e) {
      return "0000-0000-1111-1111";
    }
  }

  public static String getStringIntegerHexBlocks(int value) {
    String result = "";
    String string = Integer.toHexString(value);

    int remain = 8 - string.length();
    char[] chars = new char[remain];
    Arrays.fill(chars, '0');
    string = new String(chars) + string;

    int count = 0;
    for (int i = string.length() - 1; i >= 0; i--) {
      count++;
      result = string.substring(i, i + 1) + result;
      if (count == 4) {
        result = "-" + result;
        count = 0;
      }
    }

    if (result.startsWith("-")) {
      result = result.substring(1, result.length());
    }

    return result;
  }
}