fix: Allow changing default settings for existing app installs (#4464)

extensions/shared/library/src/main/java/app/revanced/extension/shared/settings/BooleanSetting.java

@@ -47,6 +47,10 @@ public class BooleanSetting extends Setting<Boolean> {
      */
     public static void privateSetValue(@NonNull BooleanSetting setting, @NonNull Boolean newValue) {
         setting.value = Objects.requireNonNull(newValue);
+
+        if (setting.isSetToDefault()) {
+            setting.removeFromPreferences();
+        }
     }
 
     @Override
@@ -65,10 +69,8 @@ public class BooleanSetting extends Setting<Boolean> {
     }
 
     @Override
-    public void save(@NonNull Boolean newValue) {
-        // Must set before saving to preferences (otherwise importing fails to update UI correctly).
-        value = Objects.requireNonNull(newValue);
-        preferences.saveBoolean(key, newValue);
+    public void saveToPreferences() {
+        preferences.saveBoolean(key, value);
     }
 
     @NonNull

extensions/shared/library/src/main/java/app/revanced/extension/shared/settings/EnumSetting.java

@@ -89,10 +89,8 @@ public class EnumSetting<T extends Enum<?>> extends Setting<T> {
     }
 
     @Override
-    public void save(@NonNull T newValue) {
-        // Must set before saving to preferences (otherwise importing fails to update UI correctly).
-        value = Objects.requireNonNull(newValue);
-        preferences.saveEnumAsString(key, newValue);
+    public void saveToPreferences() {
+        preferences.saveEnumAsString(key, value);
     }
 
     @NonNull

extensions/shared/library/src/main/java/app/revanced/extension/shared/settings/FloatSetting.java

@@ -55,10 +55,8 @@ public class FloatSetting extends Setting<Float> {
     }
 
     @Override
-    public void save(@NonNull Float newValue) {
-        // Must set before saving to preferences (otherwise importing fails to update UI correctly).
-        value = Objects.requireNonNull(newValue);
-        preferences.saveFloatString(key, newValue);
+    public void saveToPreferences() {
+        preferences.saveFloatString(key, value);
     }
 
     @NonNull

extensions/shared/library/src/main/java/app/revanced/extension/shared/settings/IntegerSetting.java

@@ -55,10 +55,8 @@ public class IntegerSetting extends Setting<Integer> {
     }
 
     @Override
-    public void save(@NonNull Integer newValue) {
-        // Must set before saving to preferences (otherwise importing fails to update UI correctly).
-        value = Objects.requireNonNull(newValue);
-        preferences.saveIntegerString(key, newValue);
+    public void saveToPreferences() {
+        preferences.saveIntegerString(key, value);
     }
 
     @NonNull

extensions/shared/library/src/main/java/app/revanced/extension/shared/settings/LongSetting.java

@@ -55,10 +55,8 @@ public class LongSetting extends Setting<Long> {
     }
 
     @Override
-    public void save(@NonNull Long newValue) {
-        // Must set before saving to preferences (otherwise importing fails to update UI correctly).
-        value = Objects.requireNonNull(newValue);
-        preferences.saveLongString(key, newValue);
+    public void saveToPreferences() {
+        preferences.saveLongString(key, value);
     }
 
     @NonNull

extensions/shared/library/src/main/java/app/revanced/extension/shared/settings/Setting.java

@@ -14,7 +14,6 @@ import java.util.*;
 
 import static app.revanced.extension.shared.StringRef.str;
 
-@SuppressWarnings("unused")
 public abstract class Setting<T> {
 
     /**
@@ -288,6 +287,13 @@ public abstract class Setting<T> {
      */
     public static void privateSetValueFromString(@NonNull Setting<?> setting, @NonNull String newValue) {
         setting.setValueFromString(newValue);
+
+        // Clear the preference value since default is used, to allow changing
+        // the changing the default for a future release.  Without this after upgrading
+        // the saved value will be whatever was the default when the app was first installed.
+        if (setting.isSetToDefault()) {
+            setting.removeFromPreferences();
+        }
     }
 
     /**
@@ -303,7 +309,33 @@ public abstract class Setting<T> {
     /**
      * Persistently saves the value.
      */
-    public abstract void save(@NonNull T newValue);
+    public final void save(@NonNull T newValue) {
+        if (value.equals(newValue)) {
+            return;
+        }
+
+        // Must set before saving to preferences (otherwise importing fails to update UI correctly).
+        value = Objects.requireNonNull(newValue);
+
+        if (defaultValue.equals(newValue)) {
+            removeFromPreferences();
+        } else {
+            saveToPreferences();
+        }
+    }
+
+    /**
+     * Save {@link #value} to {@link #preferences}.
+     */
+    protected abstract void saveToPreferences();
+
+    /**
+     * Remove {@link #value} from {@link #preferences}.
+     */
+    protected final void removeFromPreferences() {
+        Logger.printDebug(() -> "Clearing stored preference value (reset to default): " + key);
+        preferences.removeKey(key);
+    }
 
     @NonNull
     public abstract T get();

extensions/shared/library/src/main/java/app/revanced/extension/shared/settings/StringSetting.java

@@ -55,10 +55,8 @@ public class StringSetting extends Setting<String> {
     }
 
     @Override
-    public void save(@NonNull String newValue) {
-        // Must set before saving to preferences (otherwise importing fails to update UI correctly).
-        value = Objects.requireNonNull(newValue);
-        preferences.saveString(key, newValue);
+    public void saveToPreferences() {
+        preferences.saveString(key, value);
     }
 
     @NonNull