Add resources of new feature

app/src/main/kotlin/cn/super12138/todo/logic/Repository.kt

@@ -14,7 +14,6 @@ object Repository {
     fun getPreferenceString(context: Context, key: String, defaultValue: String) =
         SPHelper.getPreferenceString(context, key, defaultValue)
 
-
     /**
      * 获取应用设置的布尔值
      */

app/src/main/res/drawable/backup_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="M19,3L4.99,3c-1.11,0 -1.98,0.9 -1.98,2L3,19c0,1.1 0.88,2 1.99,2L19,21c1.1,0 2,-0.9 2,-2L21,5c0,-1.1 -0.9,-2 -2,-2zM19,15h-4c0,1.66 -1.35,3 -3,3s-3,-1.34 -3,-3L4.99,15L4.99,5L19,5v10zM16,10h-2L14,7h-4v3L8,10l4,4 4,-4z" />
+</vector>

app/src/main/res/drawable/restore_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="M19,3L4.99,3c-1.11,0 -1.98,0.9 -1.98,2L3,19c0,1.1 0.88,2 1.99,2L19,21c1.1,0 2,-0.9 2,-2L21,5c0,-1.1 -0.9,-2 -2,-2zM19,15h-4c0,1.66 -1.35,3 -3,3s-3,-1.34 -3,-3L4.99,15L4.99,5L19,5v10zM8,11h2v3h4v-3h2l-4,-4 -4,4z" />
+</vector>

app/src/main/res/values-zh-rCN/strings.xml

@@ -45,4 +45,8 @@
     <string name="secure_mode_summary">开启后任何人将不能对待办列表进行截屏</string>
     <string name="need_restart_app">重启应用后生效</string>
     <string name="restart_app_now">立即重启</string>
+    <string name="backup">备份数据库</string>
+    <string name="backup_summary">备份待办数据库</string>
+    <string name="restore">恢复数据库</string>
+    <string name="restore_summary">恢复先前备份过的待办数据库</string>
 </resources>

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

@@ -45,4 +45,8 @@
     <string name="secure_mode_summary">When it opens anybody cannot take screenshot for to do list</string>
     <string name="need_restart_app">Effective after restarting the app</string>
     <string name="restart_app_now">Restart now</string>
+    <string name="backup">Backup database</string>
+    <string name="backup_summary">Backup to-do database</string>
+    <string name="restore">Restore database</string>
+    <string name="restore_summary">Restore the previously backed up to-do database</string>
 </resources>

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

@@ -2,10 +2,10 @@
     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"
+            android:icon="@drawable/dark_mode_24"
             android:key="dark_mode"
             android:title="@string/dark_mode"
             app:summary="@string/dark_mode_summary" />
@@ -24,8 +24,18 @@
             android:icon="@drawable/screenshot_24"
             app:defaultValue="false"
             app:key="secure_mode"
-            app:title="@string/secure_mode"
-            app:summary="@string/secure_mode_summary" />
+            app:summary="@string/secure_mode_summary"
+            app:title="@string/secure_mode" />
+        <Preference
+            android:icon="@drawable/backup_24"
+            app:key="backupDB"
+            app:summary="@string/backup_summary"
+            app:title="@string/backup" />
+        <Preference
+            android:icon="@drawable/restore_24"
+            app:key="restoreDB"
+            app:summary="@string/restore_summary"
+            app:title="@string/restore" />
     </PreferenceCategory>
 
     <PreferenceCategory android:title="@string/others">