code: package co.infinum.example;
  
  import android.os.Build;
  
  import androidx.annotation.RequiresApi;
  import co.infinum.goldfinger.Goldfinger;
  import co.infinum.goldfinger.rx.RxGoldfinger;
  import io.reactivex.observers.DisposableObserver;
  
  @RequiresApi(Build.VERSION_CODES.M)
  public class RxSettingsActivity extends BaseSettingsActivity {
  
      private RxGoldfinger goldfinger;
  
      @Override
      protected void encryptFingerprintPin(String pin) {
          this.goldfinger.encrypt(buildPromptParams(), "fp_pin", pin)
              .subscribe(new DisposableObserver<Goldfinger.Result>() {
                  @Override
                  public void onComplete() {
                  }
  
                  @Override
                  public void onError(Throwable e) {
                      handleGoldfingerError();
                  }
  
                  @Override
                  public void onNext(Goldfinger.Result result) {
                      handleGoldfingerResult(result);
                  }
              });
      }
  
      @Override
      protected void initGoldfinger() {
          this.goldfinger = new RxGoldfinger.Builder(this)
              .logEnabled(true)
              .build();
      }
  }
  