[优化] 引导增加选择保存书籍文件夹

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

@@ -0,0 +1,61 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:paddingHorizontal="16dp">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/welcome_book_folder_tip"
+        android:textColor="?attr/colorOnSurfaceVariant"
+        android:textSize="14sp" />
+
+    <com.google.android.material.card.MaterialCardView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="12dp"
+        app:cardBackgroundColor="?attr/colorSurfaceContainerLow"
+        app:cardCornerRadius="16dp"
+        app:cardElevation="0dp"
+        app:strokeColor="?attr/colorOutlineVariant"
+        app:strokeWidth="1dp">
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="vertical"
+            android:padding="14dp">
+
+            <TextView
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:text="@string/select_book_folder"
+                android:textColor="?attr/colorOnSurface"
+                android:textStyle="bold" />
+
+            <TextView
+                android:id="@+id/tvFolderPath"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="8dp"
+                android:maxLines="3"
+                android:textColor="?attr/colorOnSurfaceVariant"
+                android:textSize="13sp" />
+
+            <com.google.android.material.button.MaterialButton
+                android:id="@+id/btnSelectFolder"
+                style="@style/Widget.Material3Expressive.Button.OutlinedButton"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="12dp"
+                android:text="@string/select_folder" />
+
+        </LinearLayout>
+
+    </com.google.android.material.card.MaterialCardView>
+
+</LinearLayout>
+

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

@@ -1248,6 +1248,8 @@
     <string name="clear_all">清除所有</string>
     <string name="welcome_title">欢迎！</string>
     <string name="first_read">请先阅读应用的服务条款与用户协议。</string>
+    <string name="welcome_book_folder_tip">设置本地书籍保存目录，后续也可在设置中修改。</string>
+    <string name="welcome_book_folder_not_selected">未选择文件夹</string>
     <string name="config_btn">配置底部按钮</string>
     <string name="compact_grid">紧凑网格</string>
     <string name="cover_grid">封面网格</string>

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

@@ -1214,4 +1214,6 @@
     <string name="sure_cache_book">是否确认开始缓存？</string>
     <string name="auto_check_new_backup_t">自动检查新备份</string>
     <string name="auto_check_new_backup_s">打开软件时检查是否有新备份，有新备份时提示是否更新</string>
+    <string name="welcome_book_folder_tip">设置本地书籍保存目录，后续也可在设置中修改。</string>
+    <string name="welcome_book_folder_not_selected">未选择文件夹</string>
 </resources>

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

@@ -1216,4 +1216,6 @@
     <string name="sure_cache_book">是否确认开始缓存？</string>
     <string name="auto_check_new_backup_t">自动检查新备份</string>
     <string name="auto_check_new_backup_s">打开软件时检查是否有新备份，有新备份时提示是否更新</string>
+    <string name="welcome_book_folder_tip">设置本地书籍保存目录，后续也可在设置中修改。</string>
+    <string name="welcome_book_folder_not_selected">未选择文件夹</string>
 </resources>

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

@@ -1251,6 +1251,8 @@
     <string name="clear_all">Clear All</string>
     <string name="welcome_title">Welcome!</string>
     <string name="first_read">Please read the Terms of Service and User Agreement first.</string>
+    <string name="welcome_book_folder_tip">Set where local books are stored. You can change it later in Settings.</string>
+    <string name="welcome_book_folder_not_selected">No folder selected</string>
     <string name="config_btn">Configure Bottom Buttons</string>
     <string name="compact_grid">Compact Grid</string>
     <string name="cover_grid">Cover Grid</string>