优化分屏模式

app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt

@@ -695,7 +695,7 @@ class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_boo
      * 更新状态栏,导航栏
      */
     override fun upSystemUiVisibility() {
-        ReadBookActivityHelp.upSystemUiVisibility(window, !read_menu.isVisible)
+        ReadBookActivityHelp.upSystemUiVisibility(window, isInMultiWindow, !read_menu.isVisible)
         upNavigationBarColor()
     }
 

app/src/main/java/io/legado/app/ui/book/read/ReadBookActivityHelp.kt

@@ -32,15 +32,20 @@ import org.jetbrains.anko.layoutInflater
 
 object ReadBookActivityHelp {
 
-
     /**
      * 更新状态栏,导航栏
      */
-    fun upSystemUiVisibility(window: Window, toolBarHide: Boolean = true) {
-        var flag = (View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
-                or View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+    fun upSystemUiVisibility(
+        window: Window,
+        isInMultiWindow: Boolean,
+        toolBarHide: Boolean = true
+    ) {
+        var flag = (View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                 or View.SYSTEM_UI_FLAG_IMMERSIVE
                 or View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY)
+        if (!isInMultiWindow) {
+            flag = flag or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
+        }
         if (ReadBookConfig.hideNavigationBar) {
             flag = flag or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
         }

app/src/main/java/io/legado/app/ui/book/read/config/BgTextConfigDialog.kt

@@ -31,7 +31,7 @@ import io.legado.app.lib.dialogs.okButton
 import io.legado.app.lib.theme.bottomBackground
 import io.legado.app.lib.theme.getPrimaryTextColor
 import io.legado.app.lib.theme.getSecondaryTextColor
-import io.legado.app.ui.book.read.ReadBookActivityHelp
+import io.legado.app.ui.book.read.ReadBookActivity
 import io.legado.app.ui.filechooser.FileChooserDialog
 import io.legado.app.ui.filechooser.FilePicker
 import io.legado.app.ui.widget.text.AutoCompleteTextView
@@ -129,9 +129,7 @@ class BgTextConfigDialog : BaseDialogFragment(), FileChooserDialog.CallBack {
         sw_dark_status_icon.onCheckedChange { buttonView, isChecked ->
             if (buttonView?.isPressed == true) {
                 setStatusIconDark(isChecked)
-                activity?.window?.let {
-                    ReadBookActivityHelp.upSystemUiVisibility(it)
-                }
+                (activity as? ReadBookActivity)?.upSystemUiVisibility()
             }
         }
         tv_text_color.onClick {