Last hope

app/src/main/java/ru/myitschool/work/data/UserRepositoryImplementation.java

@@ -36,6 +36,7 @@ public class UserRepositoryImplementation implements UserRepository, LoginReposi
         userApi.getByLogin(login).enqueue(new CallToConsumer<>(
                 callback,
                 userDto -> {
+                    if (userDto != null) {
                         final String resultLogin = userDto.login;
                         final String id = userDto.id;
                         final String name = userDto.name;
@@ -48,10 +49,10 @@ public class UserRepositoryImplementation implements UserRepository, LoginReposi
                                     userDto.photoUrl,
                                     userDto.position
                             );
-                    } else {
-                        return null;
                         }
                     }
+                    return null;
+                }
         ));
     }
 

app/src/main/java/ru/myitschool/work/ui/login/LoginFragment.java

@@ -52,7 +52,7 @@ public class LoginFragment extends Fragment {
         viewModel.errorLiveData.observe(getViewLifecycleOwner(), error ->
                 binding.error.setVisibility(Utils.visibleOrGone(error != null)));
         viewModel.stateLiveData.observe(getViewLifecycleOwner(), state -> {
-            binding.login.setClickable(state.isButtonActive());
+            binding.login.setEnabled(state.isButtonActive());
             if (state.isButtonActive()) {
                 binding.login.setBackground(ResourcesCompat.getDrawable(getResources(), R.drawable.main_button, getContext().getTheme()));
                 binding.login.setTextColor(ResourcesCompat.getColor(getResources(), R.color.white, getContext().getTheme()));

app/src/main/java/ru/myitschool/work/ui/login/LoginViewModel.java

@@ -53,8 +53,7 @@ public class LoginViewModel extends ViewModel {
             }
             if (status.getStatusCode() == 401) {
                 mutableErrorLiveData.postValue("There is no such login or incorrect");
-            }
+            } else if (status.getStatusCode() == 200) {
-            if (status.getStatusCode() == 200) {
                 mutableOpenProfileLiveData.postValue(null);
             }
         });

app/src/main/java/ru/myitschool/work/ui/profile/UserFragment.java

@@ -8,6 +8,7 @@ import android.view.View;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
 import androidx.fragment.app.FragmentResultListener;
 import androidx.lifecycle.ViewModelProvider;
 import androidx.navigation.Navigation;

app/src/main/java/ru/myitschool/work/ui/qr/result/QrResultFragment.java

@@ -40,22 +40,18 @@ public class QrResultFragment extends Fragment {
             @Override
             public void onFragmentResult(@NonNull String requestKey, @NonNull Bundle result) {
                 resultQr = QrScanDestination.INSTANCE.getDataIfExist(result);
-
-                if (getContext() != null && Utils.getLogin(getContext()) != null) {
                 viewModel.update(Utils.getLogin(getContext()), resultQr);
             }
-            }
         });
 
         viewModel.stateLiveData.observe(getViewLifecycleOwner(), state -> {
-            Log.d("status", resultQr != null ? resultQr : "None");
             if (resultQr == null) {
                 binding.result.setText(R.string.door_closed);
                 binding.close.setBackground(ResourcesCompat.getDrawable(getResources(), R.drawable.warn_button, getContext().getTheme()));
-            } else if (state.getErrorMessage() == null && state.isOpened()) {
+            } else if (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 || !state.isOpened()) {
+            } else {
                 binding.result.setText(R.string.error);
                 binding.close.setBackground(ResourcesCompat.getDrawable(getResources(), R.drawable.warn_button, getContext().getTheme()));
             }

app/src/main/res/layout/fragment_login.xml

@@ -40,7 +40,7 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:text="@string/login"
-            android:clickable="false"
+            android:enabled="false"
             android:background="@drawable/inactive_button" />
 
         <TextView

app/src/main/res/navigation/nav_graph.xml

@@ -12,7 +12,9 @@
         tools:layout="@layout/fragment_user">
         <action
             android:id="@+id/action_userFragment_to_loginFragment"
-            app:destination="@id/loginFragment" />
+            app:destination="@id/loginFragment"
+            app:popUpTo="@id/nav_graph"
+            app:popUpToInclusive="true" />
         <action
             android:id="@+id/action_userFragment_to_qrResultFragment"
             app:destination="@id/qrResultFragment" />

app/src/main/res/values-en-rUS/strings.xml

@@ -9,7 +9,7 @@
     <string name="to_main_menu">Close</string>
     <string name="door_opened">Success</string>
     <string name="door_closed">Operation was cancelled</string>
-    <string name="error">Something went wrong</string>
+    <string name="error">Something wrong</string>
     <string name="close_button">Close</string>
     <string name="logout_text">Logout</string>
     <string name="last_visit">"Last visit:"</string>