Installation.java

package starter.kit.util;

import android.content.Context;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.telephony.TelephonyManager;

import java.util.UUID;

import support.ui.app.SupportApp;

import static android.os.Build.BOARD;
import static android.os.Build.BRAND;
import static android.os.Build.DEVICE;
import static android.os.Build.DISPLAY;
import static android.os.Build.HOST;
import static android.os.Build.ID;
import static android.os.Build.MANUFACTURER;
import static android.os.Build.MODEL;
import static android.os.Build.PRODUCT;
import static android.os.Build.TAGS;
import static android.os.Build.TYPE;
import static android.os.Build.USER;
import static android.provider.Settings.Secure.ANDROID_ID;
import static android.provider.Settings.Secure.getString;

public class Installation {

  public static String genInstallationId() {
    StringBuilder sb =
        new StringBuilder(getPackageName()).append(getAndroidId()).append(getPseudoUniqueID());

    final String imei = getIMEI();
    final String macAddress = getMacAddress();

    sb.append(macAddress);
    sb.append(imei);

    if (Strings.isBlank(macAddress) && Strings.isBlank(imei)) {
      sb.append(UUID.randomUUID().toString());
    }

    return Md5Util.md5(sb.toString());
  }

  private static String getPackageName() {
    return SupportApp.appContext().getPackageName();
  }

  private static String getPseudoUniqueID() {
    return "35" + BOARD.length() % 10 +
        BRAND.length() % 10 +
        DEVICE.length() % 10 +
        DISPLAY.length() % 10 +
        HOST.length() % 10 +
        ID.length() % 10 +
        MANUFACTURER.length() % 10 +
        MODEL.length() % 10 +
        PRODUCT.length() % 10 +
        TAGS.length() % 10 +
        TYPE.length() % 10 +
        USER.length() % 10;
  }

  private static String getAndroidId() {
    return getString(SupportApp.appContext().getContentResolver(), ANDROID_ID);
  }

  private static String getIMEI() {
    try {
      TelephonyManager telephonyManager =
          (TelephonyManager) SupportApp.appContext().getSystemService(Context.TELEPHONY_SERVICE);
      return telephonyManager.getDeviceId();
    } catch (Exception exception) {
      // Nothing to do
    }
    return null;
  }

  private static String getMacAddress() {
    try {
      WifiManager e = (WifiManager) SupportApp.appContext().getSystemService(Context.WIFI_SERVICE);
      WifiInfo wInfo = e.getConnectionInfo();
      return wInfo.getMacAddress();
    } catch (Exception exception) {
      // Nothing to do
    }
    return null;
  }
}