refine extension preferences API

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

@@ -0,0 +1,18 @@
+package androidx.preference;
+
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+import android.content.Context;
+
+public class CheckBoxPreference extends Preference {
+    // reference: https://android.googlesource.com/platform/frameworks/support/+/996971f962fcd554339a7cb2859cef9ca89dbcb7/preference/preference/src/main/java/androidx/preference/CheckBoxPreference.java
+
+    public CheckBoxPreference(Context context) {
+        super(context);
+    }
+}

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

@@ -1,13 +1,18 @@
 package androidx.preference;
 
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
 import android.content.Context;
 
 public class EditTextPreference extends Preference {
     // reference: https://android.googlesource.com/platform/frameworks/support/+/996971f962fcd554339a7cb2859cef9ca89dbcb7/preference/preference/src/main/java/androidx/preference/EditTextPreference.java
 
-    private String title;
     private String text;
-    private CharSequence summary;
     private CharSequence dialogTitle;
     private CharSequence dialogMessage;
 
@@ -15,22 +20,6 @@ public class EditTextPreference extends Preference {
         super(context);
     }
 
-    public String getTitle() {
-        return title;
-    }
-
-    public void setTitle(CharSequence title) {
-        this.title = (String) title;
-    }
-
-    public CharSequence getSummary() {
-        return summary;
-    }
-
-    public void setSummary(CharSequence summary) {
-        this.summary = summary;
-    }
-
     public CharSequence getDialogTitle() {
         return dialogTitle;
     }

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

@@ -20,6 +20,7 @@ public class Preference {
 
     private String key;
     private CharSequence title;
+    private CharSequence summary;
     private Object defaultValue;
 
     @JsonIgnore
@@ -41,14 +42,26 @@ public class Preference {
         this.key = key;
     }
 
-    public void setDefaultValue(Object defaultValue) {
-        this.defaultValue = defaultValue;
-    }
-
     public CharSequence getTitle() {
         return title;
     }
 
+    public void setTitle(CharSequence title) {
+        this.title = title;
+    }
+
+    public CharSequence getSummary() {
+        return summary;
+    }
+
+    public void setSummary(CharSequence summary) {
+        this.summary = summary;
+    }
+
+    public void setDefaultValue(Object defaultValue) {
+        this.defaultValue = defaultValue;
+    }
+
     public void setOnPreferenceChangeListener(OnPreferenceChangeListener onPreferenceChangeListener) {
         this.onChangeListener = onPreferenceChangeListener;
     }
@@ -61,6 +74,10 @@ public class Preference {
         return defaultValue;
     }
 
+    public String getDefaultValueType() {
+        return defaultValue.getClass().getSimpleName();
+    }
+
     public interface OnPreferenceChangeListener {
         boolean onPreferenceChange(Preference preference, Object newValue);
     }