diff --git a/app/src/main/java/ru/myitschool/work/core/Constants.kt b/app/src/main/java/ru/myitschool/work/core/Constants.kt
index 18f9dd5..37e1835 100644
--- a/app/src/main/java/ru/myitschool/work/core/Constants.kt
+++ b/app/src/main/java/ru/myitschool/work/core/Constants.kt
@@ -2,4 +2,5 @@ package ru.myitschool.work.core
 // БЕРИТЕ И ИЗМЕНЯЙТЕ ХОСТ ТОЛЬКО ЗДЕСЬ И НЕ БЕРИТЕ ИЗ ДРУГИХ МЕСТ. ФАЙЛ ПЕРЕМЕЩАТЬ НЕЛЬЗЯ
 object Constants {
     const val SERVER_ADDRESS = "http://192.168.1.2:8080"
+    const val RESPONSE_KEY = "RESPONSE_KEY"
 }
\ No newline at end of file
diff --git a/app/src/main/java/ru/myitschool/work/ui/login/LoginFragment.java b/app/src/main/java/ru/myitschool/work/ui/login/LoginFragment.java
index 0833875..b2211b1 100644
--- a/app/src/main/java/ru/myitschool/work/ui/login/LoginFragment.java
+++ b/app/src/main/java/ru/myitschool/work/ui/login/LoginFragment.java
@@ -1,7 +1,5 @@
 package ru.myitschool.work.ui.login;
 
-import android.content.Context;
-import android.content.SharedPreferences;
 import android.os.Bundle;
 import android.text.Editable;
 import android.view.View;
@@ -31,12 +29,9 @@ public class LoginFragment extends Fragment {
         super.onViewCreated(view, savedInstanceState);
 
         if (getContext() != null) {
-            SharedPreferences sharedPreferences = getContext().getSharedPreferences("login", Context.MODE_PRIVATE);
-            if (sharedPreferences.getString("login", null) != null && getView() != null) {
-
+            if (Utils.getLogin(getContext()) != null && getView() != null)
                 Navigation.findNavController(getView()).navigate(
                         R.id.action_loginFragment_to_userFragment);
-            }
         }
 
         binding = FragmentLoginBinding.bind(view);
@@ -71,10 +66,7 @@ public class LoginFragment extends Fragment {
         viewModel.openProfileLiveData.observe(getViewLifecycleOwner(), (unused) -> {
 
             if (getContext() != null) {
-                SharedPreferences sharedPreferences = getContext().getSharedPreferences("login", Context.MODE_PRIVATE);
-                SharedPreferences.Editor editor = sharedPreferences.edit();
-                editor.putString("login", binding.username.getText().toString());
-                editor.commit();
+                Utils.saveLogin(binding.username.getText().toString(), getContext());
             }
 
             if (getView() == null) return;
diff --git a/app/src/main/java/ru/myitschool/work/ui/profile/UserFragment.java b/app/src/main/java/ru/myitschool/work/ui/profile/UserFragment.java
index 958553a..92dfe64 100644
--- a/app/src/main/java/ru/myitschool/work/ui/profile/UserFragment.java
+++ b/app/src/main/java/ru/myitschool/work/ui/profile/UserFragment.java
@@ -1,8 +1,9 @@
 package ru.myitschool.work.ui.profile;
 
-import android.content.Context;
-import android.content.SharedPreferences;
+import static ru.myitschool.work.core.Constants.RESPONSE_KEY;
+
 import android.os.Bundle;
+import android.util.Log;
 import android.view.View;
 
 import androidx.annotation.NonNull;
@@ -64,29 +65,26 @@ public class UserFragment extends Fragment {
             }
         });
 
-        if (getContext() != null) {
-            SharedPreferences preferences = getContext().getSharedPreferences(
-                    "login", Context.MODE_PRIVATE);
-            viewModel.update(preferences.getString("login", ""));
+        if (getContext() != null && Utils.getLogin(getContext()) != null) {
+            Log.d("login", Utils.getLogin(getContext()));
+            viewModel.update(Utils.getLogin(getContext()));
         }
 
         binding.refresh.setOnClickListener(v -> {
-            if (getContext() != null) {
-                SharedPreferences preferences = getContext().getSharedPreferences(
-                        "login", Context.MODE_PRIVATE);
-                viewModel.update(preferences.getString("login", ""));
+            if (getContext() != null && Utils.getLogin(getContext()) != null) {
+                viewModel.update(Utils.getLogin(getContext()));
             }
         });
 
-        binding.scan.setOnClickListener(v -> Navigation.findNavController(getView()).navigate(
-                R.id.action_userFragment_to_qrScanFragment));
+        binding.scan.setOnClickListener(v -> {
+                    if (getView() != null)
+                        Navigation.findNavController(getView()).navigate(
+                            R.id.action_userFragment_to_qrScanFragment);
+                });
 
         binding.logout.setOnClickListener(v -> {
             if (getContext() != null) {
-                SharedPreferences sharedPreferences = getContext().getSharedPreferences("login", Context.MODE_PRIVATE);
-                SharedPreferences.Editor editor = sharedPreferences.edit();
-                editor.putString("login", null);
-                editor.commit();
+                Utils.deleteLogin(getContext());
             }
             if (getView() != null) {
                 Navigation.findNavController(getView()).navigate(
@@ -98,9 +96,10 @@ public class UserFragment extends Fragment {
             @Override
             public void onFragmentResult(@NonNull String requestKey, @NonNull Bundle result) {
                 if (QrScanDestination.INSTANCE.getDataIfExist(result) != null) {
-                    getParentFragmentManager().setFragmentResult(QrScanDestination.REQUEST_KEY, result);
-                    Navigation.findNavController(getView()).navigate(
-                            R.id.action_userFragment_to_qrResultFragment);
+                    getParentFragmentManager().setFragmentResult(RESPONSE_KEY, result);
+                    if (getView() != null)
+                        Navigation.findNavController(getView()).navigate(
+                                R.id.action_userFragment_to_qrResultFragment);
                 }
             }
         });
diff --git a/app/src/main/java/ru/myitschool/work/ui/qr/result/QrResultFragment.java b/app/src/main/java/ru/myitschool/work/ui/qr/result/QrResultFragment.java
index 3ab2f0e..b1ed550 100644
--- a/app/src/main/java/ru/myitschool/work/ui/qr/result/QrResultFragment.java
+++ b/app/src/main/java/ru/myitschool/work/ui/qr/result/QrResultFragment.java
@@ -1,7 +1,7 @@
 package ru.myitschool.work.ui.qr.result;
 
-import android.content.Context;
-import android.content.SharedPreferences;
+import static ru.myitschool.work.core.Constants.RESPONSE_KEY;
+
 import android.os.Bundle;
 import android.view.View;
 
@@ -16,6 +16,7 @@ import androidx.navigation.Navigation;
 import ru.myitschool.work.R;
 import ru.myitschool.work.databinding.FragmentQrResultBinding;
 import ru.myitschool.work.ui.qr.scan.QrScanDestination;
+import ru.myitschool.work.utils.Utils;
 
 public class QrResultFragment extends Fragment {
 
@@ -33,30 +34,26 @@ public class QrResultFragment extends Fragment {
         binding = FragmentQrResultBinding.bind(view);
         viewModel = new ViewModelProvider(this).get(QrResultViewModel.class);
 
-        getParentFragmentManager().setFragmentResultListener(QrScanDestination.REQUEST_KEY, this, new FragmentResultListener() {
+        getParentFragmentManager().setFragmentResultListener(RESPONSE_KEY, this, new FragmentResultListener() {
             @Override
             public void onFragmentResult(@NonNull String requestKey, @NonNull Bundle result) {
                 resultQr = QrScanDestination.INSTANCE.getDataIfExist(result);
 
-                if (resultQr == null) {
-                    binding.result.setText(R.string.door_closed);
-                    binding.close.setBackground(ResourcesCompat.getDrawable(getResources(), R.drawable.warn_button, getContext().getTheme()));
+                if (getContext() != null && Utils.getLogin(getContext()) != null) {
+                    viewModel.update(Utils.getLogin(getContext()), resultQr);
                 }
+            }
+        });
 
-                viewModel.stateLiveData.observe(getViewLifecycleOwner(), state -> {
-                    if (state.getErrorMessage() == null && state.isOpened()) {
-                        binding.result.setText(R.string.door_opened);
-                    } else if (state.getErrorMessage() != null) {
-                        binding.result.setText(R.string.error);
-                    }
-                });
-
-                SharedPreferences sharedPreferences = getContext().getSharedPreferences("login", Context.MODE_PRIVATE);
-                String login = sharedPreferences.getString("login", null);
-
-                if (login != null) {
-                    viewModel.update(login, resultQr);
-                }
+        viewModel.stateLiveData.observe(getViewLifecycleOwner(), state -> {
+            if (state.getErrorMessage() == null && state.isOpened()) {
+                binding.result.setText(R.string.door_opened);
+                binding.close.setBackground(ResourcesCompat.getDrawable(getResources(), R.drawable.main_button, getContext().getTheme()));
+            } else if (state.getErrorMessage() != null) {
+                binding.result.setText(R.string.error);
+            } else if (resultQr == null) {
+                binding.result.setText(R.string.door_closed);
+                binding.close.setBackground(ResourcesCompat.getDrawable(getResources(), R.drawable.warn_button, getContext().getTheme()));
             }
         });
 
diff --git a/app/src/main/java/ru/myitschool/work/utils/Utils.java b/app/src/main/java/ru/myitschool/work/utils/Utils.java
index 4e046c6..5617742 100644
--- a/app/src/main/java/ru/myitschool/work/utils/Utils.java
+++ b/app/src/main/java/ru/myitschool/work/utils/Utils.java
@@ -3,10 +3,32 @@ package ru.myitschool.work.utils;
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
 
+import android.content.Context;
+import android.content.SharedPreferences;
+
 
 public class Utils {
 
     public static int visibleOrGone(boolean isVisible) {
         return isVisible ? VISIBLE : GONE;
     }
+    public static void saveLogin(String login, Context context) {
+        SharedPreferences sharedPreferences = context.getSharedPreferences("login", Context.MODE_PRIVATE);
+        SharedPreferences.Editor editor = sharedPreferences.edit();
+        editor.putString("login", login);
+        editor.commit();
+    }
+
+    public static void deleteLogin(Context context) {
+        SharedPreferences sharedPreferences = context.getSharedPreferences("login", Context.MODE_PRIVATE);
+        SharedPreferences.Editor editor = sharedPreferences.edit();
+        editor.putString("login", null);
+        editor.commit();
+    }
+
+    public static String getLogin(Context context) {
+        SharedPreferences preferences = context.getSharedPreferences(
+                "login", Context.MODE_PRIVATE);
+        return preferences.getString("login", null);
+    }
 }