diff --git a/app/src/main/java/io/legado/app/lib/theme/ATHUtils.kt b/app/src/main/java/io/legado/app/lib/theme/ATHUtils.kt
index 24d0a923a..73e342713 100644
--- a/app/src/main/java/io/legado/app/lib/theme/ATHUtils.kt
+++ b/app/src/main/java/io/legado/app/lib/theme/ATHUtils.kt
@@ -8,10 +8,6 @@ import androidx.annotation.AttrRes
  */
 object ATHUtils {
 
-    fun isWindowBackgroundDark(context: Context): Boolean {
-        return !ColorUtils.isColorLight(resolveColor(context, android.R.attr.windowBackground))
-    }
-
     @JvmOverloads
     fun resolveColor(context: Context, @AttrRes attr: Int, fallback: Int = 0): Int {
         val a = context.theme.obtainStyledAttributes(intArrayOf(attr))
diff --git a/app/src/main/java/io/legado/app/ui/book/read/page/delegate/PageDelegate.kt b/app/src/main/java/io/legado/app/ui/book/read/page/delegate/PageDelegate.kt
index e4cbf9560..9b0ad7c5e 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/page/delegate/PageDelegate.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/page/delegate/PageDelegate.kt
@@ -45,7 +45,7 @@ abstract class PageDelegate(protected val pageView: PageView) {
     protected var atTop: Boolean = false
     protected var atBottom: Boolean = false
 
-    private var snackbar: Snackbar? = null
+    private var snackBar: Snackbar? = null
 
     private val scroller: Scroller by lazy {
         Scroller(
@@ -291,10 +291,10 @@ abstract class PageDelegate(protected val pageView: PageView) {
         direction = Direction.PREV
         val hasPrev = pageView.pageFactory?.hasPrev() == true
         if (!hasPrev) {
-            snackbar ?: let {
-                snackbar = pageView.snackbar("没有上一页")
+            snackBar ?: let {
+                snackBar = pageView.snackbar("没有上一页")
             }
-            snackbar?.let {
+            snackBar?.let {
                 if (!it.isShown) {
                     it.setText("没有上一页")
                     it.show()
@@ -309,10 +309,10 @@ abstract class PageDelegate(protected val pageView: PageView) {
         direction = Direction.NEXT
         val hasNext = pageView.pageFactory?.hasNext() == true
         if (!hasNext) {
-            snackbar ?: let {
-                snackbar = pageView.snackbar("没有下一页")
+            snackBar ?: let {
+                snackBar = pageView.snackbar("没有下一页")
             }
-            snackbar?.let {
+            snackBar?.let {
                 if (!it.isShown) {
                     it.setText("没有下一页")
                     it.show()
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index c71703292..2bfe28e42 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -609,4 +609,5 @@
     <string name="chage_icon_error">图标为矢量图标,Android8.0以前不支持</string>
     <string name="aloud_config">朗读设置</string>
     <string name="main_activity">主界面</string>
+    <string name="selectText">选择文本</string>
 </resources>
diff --git a/app/src/main/res/xml/pref_config_read.xml b/app/src/main/res/xml/pref_config_read.xml
index 5aae899c8..7b86b5efa 100644
--- a/app/src/main/res/xml/pref_config_read.xml
+++ b/app/src/main/res/xml/pref_config_read.xml
@@ -40,6 +40,12 @@
         android:key="volumeKeyPageOnPlay"
         app:iconSpaceReserved="false" />
 
+    <io.legado.app.lib.theme.prefs.ATESwitchPreference
+        android:defaultValue="true"
+        android:title="@string/selectText"
+        android:key="selectText"
+        app:iconSpaceReserved="false" />
+
     <Preference
         android:key="customPageKey"
         android:title="@string/custom_page_key"