UidUtils

UidUtils.java

public enum UidUtils {
  INSTANCE;

  private final static String DEFAULT_ID = "anonymous";

  private String androidId = DEFAULT_ID;

  private String advertisingId = "";
  private boolean limitAdTrackingEnabled = false;

  @SuppressLint("HardwareIds") public void init(@NonNull final Context context) {
    androidId = Settings.Secure.getString(context.getContentResolver(), Settings.Secure.ANDROID_ID);
    
    new Thread(new Runnable() {
      public void run() {
        advertisingId = internalGetAdvertisingId(context);
        limitAdTrackingEnabled = internalIsPlayTrackingEnabled(context);
      }
    }).start();
  }

  public @NonNull String getUid() {
    try {
      if (!TextUtils.isEmpty(advertisingId) && !limitAdTrackingEnabled) {
        return advertisingId;
      }
    } catch (Exception ignored) {
    }
   return !TextUtils.isEmpty(androidId) ? androidId : DEFAULT_ID;
  }

  public boolean isLimitAdTrackingEnabled() {
    return limitAdTrackingEnabled;
  }

  private String internalGetAdvertisingId(@NonNull Context context) {
    try {
      Object AdvertisingInfoObject = getAdvertisingIdInfoObject(context);
      return (String) invokeInstanceMethod(AdvertisingInfoObject, "getId", null);
    } catch (Throwable t) {
      return null;
    }
  }

  private Boolean internalIsPlayTrackingEnabled(@NonNull Context context) {
    try {
      Object AdvertisingInfoObject = getAdvertisingIdInfoObject(context);
      Boolean isLimitedTrackingEnabled =
          (Boolean) invokeInstanceMethod(AdvertisingInfoObject, "isLimitAdTrackingEnabled", null);
      return isLimitedTrackingEnabled == null ? false : isLimitedTrackingEnabled;
    } catch (Throwable t) {
      return false;
    }
  }

  private Object getAdvertisingIdInfoObject(@NonNull Context context) throws Exception {
    return invokeStaticMethod("com.google.android.gms.ads.identifier.AdvertisingIdClient", "getAdvertisingIdInfo",
        new Class[] { Context.class }, context);
  }

  private Object invokeStaticMethod(@NonNull String className, @NonNull String methodName, Class[] classArgs,
      Object... args) throws Exception {
    Class classObject = Class.forName(className);
    return invokeMethod(classObject, methodName, null, classArgs, args);
  }

  private Object invokeMethod(@NonNull Class classObject, @NonNull String methodName, Object instance, Class[] cArgs,
      Object... args) throws Exception {
    @SuppressWarnings("unchecked") Method methodObject = classObject.getMethod(methodName, cArgs);
    if (methodObject == null) {
      return null;
    }
    return methodObject.invoke(instance, args);
  }

  private Object invokeInstanceMethod(@NonNull Object instance, @NonNull String methodName, Class[] classArgs,
      Object... args) throws Exception {
    Class classObject = instance.getClass();
    return invokeMethod(classObject, methodName, instance, classArgs, args);
  }
}