Refactor settings SharedPreferences access

app/src/main/java/com/d4rk/androidtutorials/java/data/repository/SettingsRepository.java

@@ -6,5 +6,10 @@ public interface SettingsRepository {
     void handlePreferenceChange(String key);
     boolean applyTheme();
     void applyConsent();
-    SharedPreferences getSharedPreferences();
+
+    void registerPreferenceChangeListener(SharedPreferences.OnSharedPreferenceChangeListener listener);
+    void unregisterPreferenceChangeListener(SharedPreferences.OnSharedPreferenceChangeListener listener);
+
+    String getDarkMode();
+    void setConsentAccepted(boolean accepted);
 }

app/src/main/java/com/d4rk/androidtutorials/java/di/AppModule.java

@@ -36,7 +36,10 @@
 import com.d4rk.androidtutorials.java.domain.main.ShouldShowStartupScreenUseCase;
 import com.d4rk.androidtutorials.java.domain.quiz.LoadQuizQuestionsUseCase;
 import com.d4rk.androidtutorials.java.domain.settings.ApplyConsentUseCase;
-import com.d4rk.androidtutorials.java.domain.settings.GetSharedPreferencesUseCase;
+import com.d4rk.androidtutorials.java.domain.settings.GetDarkModeUseCase;
+import com.d4rk.androidtutorials.java.domain.settings.RegisterPreferenceChangeListenerUseCase;
+import com.d4rk.androidtutorials.java.domain.settings.UnregisterPreferenceChangeListenerUseCase;
+import com.d4rk.androidtutorials.java.domain.settings.SetConsentAcceptedUseCase;
 import com.d4rk.androidtutorials.java.domain.settings.OnPreferenceChangedUseCase;
 import com.d4rk.androidtutorials.java.domain.startup.LoadConsentFormUseCase;
 import com.d4rk.androidtutorials.java.domain.startup.RequestConsentInfoUseCase;
@@ -183,13 +186,28 @@ public OnPreferenceChangedUseCase provideOnPreferenceChangedUseCase(SettingsRepo
     }
 
     @Provides
-    public GetSharedPreferencesUseCase provideGetSharedPreferencesUseCase(SettingsRepository repository) {
-        return new GetSharedPreferencesUseCase(repository);
+    public ApplyConsentUseCase provideApplyConsentUseCase(SettingsRepository repository) {
+        return new ApplyConsentUseCase(repository);
     }
 
     @Provides
-    public ApplyConsentUseCase provideApplyConsentUseCase(SettingsRepository repository) {
-        return new ApplyConsentUseCase(repository);
+    public RegisterPreferenceChangeListenerUseCase provideRegisterPreferenceChangeListenerUseCase(SettingsRepository repository) {
+        return new RegisterPreferenceChangeListenerUseCase(repository);
+    }
+
+    @Provides
+    public UnregisterPreferenceChangeListenerUseCase provideUnregisterPreferenceChangeListenerUseCase(SettingsRepository repository) {
+        return new UnregisterPreferenceChangeListenerUseCase(repository);
+    }
+
+    @Provides
+    public GetDarkModeUseCase provideGetDarkModeUseCase(SettingsRepository repository) {
+        return new GetDarkModeUseCase(repository);
+    }
+
+    @Provides
+    public SetConsentAcceptedUseCase provideSetConsentAcceptedUseCase(SettingsRepository repository) {
+        return new SetConsentAcceptedUseCase(repository);
     }
 
     @Provides

app/src/main/java/com/d4rk/androidtutorials/java/domain/settings/GetDarkModeUseCase.java

@@ -0,0 +1,16 @@
+package com.d4rk.androidtutorials.java.domain.settings;
+
+import com.d4rk.androidtutorials.java.data.repository.SettingsRepository;
+
+/** Returns the stored dark mode preference value. */
+public class GetDarkModeUseCase {
+    private final SettingsRepository repository;
+
+    public GetDarkModeUseCase(SettingsRepository repository) {
+        this.repository = repository;
+    }
+
+    public String invoke() {
+        return repository.getDarkMode();
+    }
+}

app/src/main/java/com/d4rk/androidtutorials/java/domain/settings/RegisterPreferenceChangeListenerUseCase.java

@@ -0,0 +1,17 @@
+package com.d4rk.androidtutorials.java.domain.settings;
+
+import android.content.SharedPreferences;
+import com.d4rk.androidtutorials.java.data.repository.SettingsRepository;
+
+/** Registers a listener for preference changes. */
+public class RegisterPreferenceChangeListenerUseCase {
+    private final SettingsRepository repository;
+
+    public RegisterPreferenceChangeListenerUseCase(SettingsRepository repository) {
+        this.repository = repository;
+    }
+
+    public void invoke(SharedPreferences.OnSharedPreferenceChangeListener listener) {
+        repository.registerPreferenceChangeListener(listener);
+    }
+}

app/src/main/java/com/d4rk/androidtutorials/java/domain/settings/SetConsentAcceptedUseCase.java

@@ -0,0 +1,16 @@
+package com.d4rk.androidtutorials.java.domain.settings;
+
+import com.d4rk.androidtutorials.java.data.repository.SettingsRepository;
+
+/** Writes whether the user has accepted analytics consent. */
+public class SetConsentAcceptedUseCase {
+    private final SettingsRepository repository;
+
+    public SetConsentAcceptedUseCase(SettingsRepository repository) {
+        this.repository = repository;
+    }
+
+    public void invoke(boolean accepted) {
+        repository.setConsentAccepted(accepted);
+    }
+}

app/src/main/java/com/d4rk/androidtutorials/java/domain/settings/UnregisterPreferenceChangeListenerUseCase.java

@@ -0,0 +1,17 @@
+package com.d4rk.androidtutorials.java.domain.settings;
+
+import android.content.SharedPreferences;
+import com.d4rk.androidtutorials.java.data.repository.SettingsRepository;
+
+/** Unregisters a listener for preference changes. */
+public class UnregisterPreferenceChangeListenerUseCase {
+    private final SettingsRepository repository;
+
+    public UnregisterPreferenceChangeListenerUseCase(SettingsRepository repository) {
+        this.repository = repository;
+    }
+
+    public void invoke(SharedPreferences.OnSharedPreferenceChangeListener listener) {
+        repository.unregisterPreferenceChangeListener(listener);
+    }
+}

app/src/main/java/com/d4rk/androidtutorials/java/ui/screens/settings/SettingsActivity.java

@@ -46,8 +46,7 @@ protected void onCreate(@Nullable Bundle savedInstanceState) {
             supportActionBar.setDisplayHomeAsUpEnabled(true);
         }
 
-        SharedPreferences prefs = settingsViewModel.getSharedPreferences();
-        prefs.registerOnSharedPreferenceChangeListener(this);
+        settingsViewModel.registerPreferenceChangeListener(this);
     }
 
     @Override
@@ -64,9 +63,14 @@ public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, Strin
     @Override
     public CharSequence provideSummary(ListPreference preference) {
         String key = preference.getKey();
-        if (key != null) {
-            if (key.equals(getString(R.string.dark_mode))) {
-                return preference.getEntry();
+        if (key != null && key.equals(getString(R.string.dark_mode))) {
+            String value = settingsViewModel.getDarkMode();
+            int index = preference.findIndexOfValue(value);
+            if (index >= 0) {
+                CharSequence[] entries = preference.getEntries();
+                if (entries != null && index < entries.length) {
+                    return entries[index];
+                }
             }
         }
         return null;
@@ -75,7 +79,6 @@ public CharSequence provideSummary(ListPreference preference) {
     @Override
     protected void onDestroy() {
         super.onDestroy();
-        SharedPreferences prefs = settingsViewModel.getSharedPreferences();
-        prefs.unregisterOnSharedPreferenceChangeListener(this);
+        settingsViewModel.unregisterPreferenceChangeListener(this);
     }
 }

app/src/main/java/com/d4rk/androidtutorials/java/ui/screens/settings/SettingsViewModel.java

@@ -5,7 +5,10 @@
 import androidx.lifecycle.ViewModel;
 
 import com.d4rk.androidtutorials.java.domain.settings.OnPreferenceChangedUseCase;
-import com.d4rk.androidtutorials.java.domain.settings.GetSharedPreferencesUseCase;
+import com.d4rk.androidtutorials.java.domain.settings.RegisterPreferenceChangeListenerUseCase;
+import com.d4rk.androidtutorials.java.domain.settings.UnregisterPreferenceChangeListenerUseCase;
+import com.d4rk.androidtutorials.java.domain.settings.GetDarkModeUseCase;
+import com.d4rk.androidtutorials.java.domain.settings.SetConsentAcceptedUseCase;
 import com.d4rk.androidtutorials.java.domain.settings.ApplyConsentUseCase;
 
 import dagger.hilt.android.lifecycle.HiltViewModel;
@@ -20,15 +23,24 @@
 public class SettingsViewModel extends ViewModel {
 
     private final OnPreferenceChangedUseCase onPreferenceChangedUseCase;
-    private final GetSharedPreferencesUseCase getSharedPreferencesUseCase;
+    private final RegisterPreferenceChangeListenerUseCase registerPreferenceChangeListenerUseCase;
+    private final UnregisterPreferenceChangeListenerUseCase unregisterPreferenceChangeListenerUseCase;
+    private final GetDarkModeUseCase getDarkModeUseCase;
+    private final SetConsentAcceptedUseCase setConsentAcceptedUseCase;
     private final ApplyConsentUseCase applyConsentUseCase;
 
     @Inject
     public SettingsViewModel(OnPreferenceChangedUseCase onPreferenceChangedUseCase,
-                             GetSharedPreferencesUseCase getSharedPreferencesUseCase,
+                             RegisterPreferenceChangeListenerUseCase registerPreferenceChangeListenerUseCase,
+                             UnregisterPreferenceChangeListenerUseCase unregisterPreferenceChangeListenerUseCase,
+                             GetDarkModeUseCase getDarkModeUseCase,
+                             SetConsentAcceptedUseCase setConsentAcceptedUseCase,
                              ApplyConsentUseCase applyConsentUseCase) {
         this.onPreferenceChangedUseCase = onPreferenceChangedUseCase;
-        this.getSharedPreferencesUseCase = getSharedPreferencesUseCase;
+        this.registerPreferenceChangeListenerUseCase = registerPreferenceChangeListenerUseCase;
+        this.unregisterPreferenceChangeListenerUseCase = unregisterPreferenceChangeListenerUseCase;
+        this.getDarkModeUseCase = getDarkModeUseCase;
+        this.setConsentAcceptedUseCase = setConsentAcceptedUseCase;
         this.applyConsentUseCase = applyConsentUseCase;
     }
 
@@ -41,11 +53,23 @@ public boolean onPreferenceChanged(String key) {
         return onPreferenceChangedUseCase.invoke(key);
     }
 
-    public SharedPreferences getSharedPreferences() {
-        return getSharedPreferencesUseCase.invoke();
-    }
-
     public void applyConsent() {
         applyConsentUseCase.invoke();
     }
+
+    public void registerPreferenceChangeListener(SharedPreferences.OnSharedPreferenceChangeListener listener) {
+        registerPreferenceChangeListenerUseCase.invoke(listener);
+    }
+
+    public void unregisterPreferenceChangeListener(SharedPreferences.OnSharedPreferenceChangeListener listener) {
+        unregisterPreferenceChangeListenerUseCase.invoke(listener);
+    }
+
+    public String getDarkMode() {
+        return getDarkModeUseCase.invoke();
+    }
+
+    public void setConsentAccepted(boolean accepted) {
+        setConsentAcceptedUseCase.invoke(accepted);
+    }
 }

app/src/main/java/com/d4rk/androidtutorials/java/ui/screens/settings/repository/SettingsRepository.java

@@ -112,7 +112,27 @@ public void applyConsent() {
         FirebaseAnalytics.getInstance(context).setConsent(map);
     }
 
-    public SharedPreferences getSharedPreferences() {
-        return sharedPreferences;
+    @Override
+    public void registerPreferenceChangeListener(SharedPreferences.OnSharedPreferenceChangeListener listener) {
+        sharedPreferences.registerOnSharedPreferenceChangeListener(listener);
+    }
+
+    @Override
+    public void unregisterPreferenceChangeListener(SharedPreferences.OnSharedPreferenceChangeListener listener) {
+        sharedPreferences.unregisterOnSharedPreferenceChangeListener(listener);
+    }
+
+    @Override
+    public String getDarkMode() {
+        String preferenceKey = context.getString(R.string.key_theme);
+        String defaultThemeValue = context.getString(R.string.default_value_theme);
+        return sharedPreferences.getString(preferenceKey, defaultThemeValue);
+    }
+
+    @Override
+    public void setConsentAccepted(boolean accepted) {
+        sharedPreferences.edit()
+                .putBoolean(context.getString(R.string.key_consent_analytics), accepted)
+                .apply();
     }
 }