add support for MultiSelectListPreference (#258)

* add support for MultiSelectListPreference

* Update AndroidCompat/src/main/java/xyz/nulldev/androidcompat/io/sharedprefs/JavaSharedPreferences.kt

Co-authored-by: Mitchell Syer <Mitchellptbo@gmail.com>

* don't convert to list

* fix by @Syer10

Co-authored-by: Mitchell Syer <Mitchellptbo@gmail.com>

AndroidCompat/src/main/java/androidx/preference/MultiSelectListPreference.java

@@ -13,33 +13,49 @@ import com.fasterxml.jackson.annotation.JsonIgnore;
 import java.util.Set;
 
 public class MultiSelectListPreference extends DialogPreference {
+    // reference: https://android.googlesource.com/platform/frameworks/support/+/996971f962fcd554339a7cb2859cef9ca89dbcb7/preference/preference/src/main/java/androidx/preference/MultiSelectListPreference.java
     // Note: remove @JsonIgnore and implement methods if any extension ever uses these methods or the variables behind them
 
-    public MultiSelectListPreference(Context context) { super(context); }
+    private CharSequence[] entries;
+    private CharSequence[] entryValues;
+
+    public MultiSelectListPreference(Context context) {
+        super(context);
+    }
+
+    public void setEntries(CharSequence[] entries) {
+        this.entries = entries;
+    }
+
+    public CharSequence[] getEntries() {
+        return entries;
+    }
+
+    public void setEntryValues(CharSequence[] entryValues) {
+        this.entryValues = entryValues;
+    }
+
+    public CharSequence[] getEntryValues() {
+        return entryValues;
+    }
 
     @JsonIgnore
-    public void setEntries(CharSequence[] entries) { throw new RuntimeException("Stub!"); }
+    public void setValues(Set<String> values) {
+        throw new RuntimeException("Stub!");
+    }
 
     @JsonIgnore
-    public CharSequence[] getEntries() { throw new RuntimeException("Stub!"); }
+    public Set<String> getValues() {
+        throw new RuntimeException("Stub!");
+    }
 
-    @JsonIgnore
-    public void setEntryValues(CharSequence[] entryValues) { throw new RuntimeException("Stub!"); }
-
-    @JsonIgnore
-    public CharSequence[] getEntryValues() { throw new RuntimeException("Stub!"); }
-
-    @JsonIgnore
-    public void setValues(Set<String> values) { throw new RuntimeException("Stub!"); }
-
-    @JsonIgnore
-    public Set<String> getValues() { throw new RuntimeException("Stub!"); }
-
-    public int findIndexOfValue(String value) { throw new RuntimeException("Stub!"); }
+    public int findIndexOfValue(String value) {
+        throw new RuntimeException("Stub!");
+    }
 
     /** Tachidesk specific API */
     @Override
     public String getDefaultValueType() {
-        return "Set";
+        return "Set<String>";
     }
 }

AndroidCompat/src/main/java/androidx/preference/Preference.java

@@ -10,6 +10,7 @@ package androidx.preference;
 import android.content.Context;
 import android.content.SharedPreferences;
 import com.fasterxml.jackson.annotation.JsonIgnore;
+import java.util.Set;
 
 /**
  * A minimal implementation of androidx.preference.Preference
@@ -113,18 +114,22 @@ public class Preference {
     }
 
     /** Tachidesk specific API */
+    @SuppressWarnings("unchecked")
     public Object getCurrentValue() {
         switch (getDefaultValueType()) {
             case "String":
                 return sharedPreferences.getString(key, (String)defaultValue);
             case "Boolean":
                 return sharedPreferences.getBoolean(key, (Boolean)defaultValue);
+            case "Set<String>":
+                return sharedPreferences.getStringSet(key, (Set<String>)defaultValue);
             default:
                 throw new RuntimeException("Unsupported type");
         }
     }
 
     /** Tachidesk specific API */
+    @SuppressWarnings("unchecked")
     public void saveNewValue(Object value) {
         switch (getDefaultValueType()) {
             case "String":
@@ -133,6 +138,9 @@ public class Preference {
             case "Boolean":
                 sharedPreferences.edit().putBoolean(key, (Boolean)value).apply();
                 break;
+            case "Set<String>":
+                sharedPreferences.edit().putStringSet(key, (Set<String>)value).apply();
+                break;
             default:
                 throw new RuntimeException("Unsupported type");
         }

AndroidCompat/src/main/java/xyz/nulldev/androidcompat/io/sharedprefs/JavaSharedPreferences.kt

@@ -12,11 +12,11 @@ import com.russhwolf.settings.ExperimentalSettingsApi
 import com.russhwolf.settings.ExperimentalSettingsImplementation
 import com.russhwolf.settings.JvmPreferencesSettings
 import com.russhwolf.settings.serialization.decodeValue
+import com.russhwolf.settings.serialization.decodeValueOrNull
 import com.russhwolf.settings.serialization.encodeValue
 import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.SerializationException
 import kotlinx.serialization.builtins.SetSerializer
-import kotlinx.serialization.builtins.nullable
 import kotlinx.serialization.builtins.serializer
 import java.util.prefs.PreferenceChangeListener
 import java.util.prefs.Preferences
@@ -40,13 +40,13 @@ class JavaSharedPreferences(key: String) : SharedPreferences {
         }
     }
 
-    override fun getStringSet(key: String, defValues: MutableSet<String>?): MutableSet<String>? {
+    override fun getStringSet(key: String, defValues: Set<String>?): Set<String>? {
         try {
             return if (defValues != null) {
-                preferences.decodeValue(SetSerializer(String.serializer()).nullable, key, defValues)
+                preferences.decodeValue(SetSerializer(String.serializer()), key, defValues)
             } else {
-                preferences.decodeValue(SetSerializer(String.serializer()).nullable, key, null)
-            }?.toMutableSet()
+                preferences.decodeValueOrNull(SetSerializer(String.serializer()), key)
+            }
         } catch (e: SerializationException) {
             throw ClassCastException("$key was not a StringSet")
         }