如何在Android Studio中修复'onAuthenticationError'方法？

Question

我制作了一个使用指纹传感器停用服务的android应用，但是当我锁定设备（让服务在后台运行）然后恢复该应用时，会出现来自“ onAuthenticationError”的错误消息方法，它不会使用正确的指纹或错误的指纹进行更新，只是停留在该错误上，直到重新启动应用程序为止。

@TargetApi(Build.VERSION_CODES.M)
public class HuellaDigital extends 
FingerprintManager.AuthenticationCallback {
private Context context;
TextView textView;
ImageView imageView;
Vibrator vibrator;

Servicio servicio = new Servicio();




public HuellaDigital(Context context) {
    this.context = context;
}

public void startAuth(FingerprintManager fingerprintManager, 
FingerprintManager.CryptoObject cryptoObject) {
    CancellationSignal cancellationSignal = new CancellationSignal();
    fingerprintManager.authenticate(cryptoObject, cancellationSignal, 0, 
this, null);
}

@Override
public void onAuthenticationError(int errorCode, CharSequence errString) {

    this.update("Error al leer la huella, intente de nuevo. " + errString, 
false);
    imageView =((Activity) context).findViewById(R.id.img);
    imageView.setImageResource(R.drawable.ic_error);
    servicio.Activado = true;
}

@Override
public void onAuthenticationFailed() {
    this.update("Huella no registrada, favor de usar una registrada", 
false);
    imageView =((Activity) context).findViewById(R.id.img);
    imageView.setImageResource(R.drawable.ic_error);
    servicio.Activado = true;
}

@Override
public void onAuthenticationHelp(int helpCode, CharSequence helpString) {
    this.update("Error: " + helpString, false);
    servicio.Activado = false;
}

@Override
public void 
onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result) 
{
    this.update("Proteccion desactivada.", true);
    servicio.Activado = false;
    context.stopService(new Intent(context, Servicio.class));
    imageView =((Activity) context).findViewById(R.id.img);
    imageView.setImageResource(R.drawable.ic_done);
    vibrator = 
    (Vibrator)context.getSystemService(Context.VIBRATOR_SERVICE);
    vibrator.cancel();


}

public void update(String s, boolean b) {
    Servicio servicio = new Servicio();
    textView = (TextView) ((Activity) context).findViewById(R.id.txtMsg);
    textView.setText(s);
    if (b == false){
        textView.setTextColor(ContextCompat.getColor(context, 
R.color.ColorSecundario));

    }else {

        textView.setTextColor(ContextCompat.getColor(context, 
 R.color.ColorDone));

       }

   }

}