Add icons for each preference

app/src/main/res/drawable/about_24.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:tint="?attr/colorControlNormal"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M12,2C6.48,2 2,6.48 2,12s4.48,10 10,10 10,-4.48 10,-10S17.52,2 12,2zM13,17h-2v-6h2v6zM13,9h-2L11,7h2v2z" />
+</vector>

app/src/main/res/drawable/dark_mode_24.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:tint="?attr/colorControlNormal"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M12,3c-4.97,0 -9,4.03 -9,9s4.03,9 9,9s9,-4.03 9,-9c0,-0.46 -0.04,-0.92 -0.1,-1.36c-0.98,1.37 -2.58,2.26 -4.4,2.26c-2.98,0 -5.4,-2.42 -5.4,-5.4c0,-1.81 0.89,-3.42 2.26,-4.4C12.92,3.04 12.46,3 12,3L12,3z" />
+</vector>

app/src/main/res/drawable/screenshot_24.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:tint="?attr/colorControlNormal"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M17,1.01L7,1C5.9,1 5,1.9 5,3v18c0,1.1 0.9,2 2,2h10c1.1,0 2,-0.9 2,-2V3C19,1.9 18.1,1.01 17,1.01zM17,18H7V6h10V18zM9.5,8.5H12V7H8v4h1.5V8.5zM12,17h4v-4h-1.5v2.5H12V17z" />
+</vector>

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

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<com.google.android.material.materialswitch.MaterialSwitch xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/switchWidget"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:background="@null"
+    android:clickable="false"
+    android:focusable="false" />

app/src/main/res/values/themes.xml

@@ -47,7 +47,25 @@
         <item name="colorSurfaceContainer">@color/md_theme_surfaceContainer</item>
         <item name="colorSurfaceContainerHigh">@color/md_theme_surfaceContainerHigh</item>
         <item name="colorSurfaceContainerHighest">@color/md_theme_surfaceContainerHighest</item>
+
+        <item name="preferenceTheme">@style/AppPreferenceThemeOverlay</item>
+        <item name="alertDialogTheme">@style/ToDo.M3AlertDialog</item>
     </style>
 
     <style name="Theme.ToDo" parent="Base.Theme.ToDo" />
+
+    <style name="AppPreferenceThemeOverlay" parent="@style/PreferenceThemeOverlay">
+        <item name="switchPreferenceCompatStyle">@style/AppSwitchPreference</item>
+    </style>
+
+    <style name="AppSwitchPreference" parent="@style/Preference.SwitchPreferenceCompat.Material">
+        <item name="widgetLayout">@layout/preference_material_switch</item>
+    </style>
+
+    <style name="ToDo.M3AlertDialog" parent="ThemeOverlay.Material3.MaterialAlertDialog">
+        <item name="dialogCornerRadius">28dp</item>
+        <item name="cornerFamily">rounded</item>
+        <item name="android:colorBackground">?attr/colorSurfaceContainerHigh</item>
+        <item name="android:layout">@layout/m3_alert_dialog</item>
+    </style>
 </resources>

app/src/main/res/xml/preferences.xml

@@ -2,6 +2,7 @@
     xmlns:app="http://schemas.android.com/apk/res-auto">
     <PreferenceCategory app:title="@string/appearance">
         <ListPreference
+            android:icon="@drawable/dark_mode_24"
             android:defaultValue="0"
             android:entries="@array/appearance"
             android:entryValues="@array/appearance_value"
@@ -20,6 +21,7 @@
             app:dialogMessage="多个项目请使用英文逗号隔开"
             app:summary="自定义创建待办时文本框的预测项" />-->
         <SwitchPreferenceCompat
+            android:icon="@drawable/screenshot_24"
             app:defaultValue="false"
             app:key="secure_mode"
             app:title="@string/secure_mode"
@@ -27,7 +29,9 @@
     </PreferenceCategory>
 
     <PreferenceCategory android:title="@string/others">
-        <Preference app:title="@string/about_label">
+        <Preference
+            android:icon="@drawable/about_24"
+            app:title="@string/about_label">
             <intent
                 android:targetClass="cn.super12138.todo.views.about.AboutActivity"
                 android:targetPackage="cn.super12138.todo" />