diff --git a/app/src/main/java/io/legado/app/utils/ViewModelKt.kt b/app/src/main/java/io/legado/app/utils/ViewModelKt.kt
index ed963ec8e..2d66826c1 100644
--- a/app/src/main/java/io/legado/app/utils/ViewModelKt.kt
+++ b/app/src/main/java/io/legado/app/utils/ViewModelKt.kt
@@ -9,4 +9,4 @@ fun <T : ViewModel> AppCompatActivity.getViewModel(clazz: Class<T>) = ViewModelP
 
 fun <T : ViewModel> Fragment.getViewModel(clazz: Class<T>) = ViewModelProviders.of(this).get(clazz)
 
-fun <T : ViewModel> Fragment.getViewModelOfActivity(clazz: Class<T>) = ViewModelProviders.of(requireActivity()).get(clazz)
+fun <T : ViewModel> Fragment.getViewModelOfActivity(clazz: Class<T>) = ViewModelProviders.of(requireActivity()).get(clazz)
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_book_source.xml b/app/src/main/res/layout/fragment_book_source.xml
index ae3d1f23c..d1ec2da0a 100644
--- a/app/src/main/res/layout/fragment_book_source.xml
+++ b/app/src/main/res/layout/fragment_book_source.xml
@@ -1,9 +1,10 @@
 <?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:orientation="vertical"
-              android:layout_width="match_parent"
-              android:layout_height="match_parent">
+<androidx.constraintlayout.widget.ConstraintLayout
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
+        android:orientation="vertical"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
 
     <io.legado.app.ui.widget.TitleBar
             android:id="@+id/title_bar"
@@ -13,4 +14,4 @@
             app:layout_constraintTop_toTopOf="parent"
             app:title="@string/book_source"/>
 
-</LinearLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_find_book.xml b/app/src/main/res/layout/fragment_find_book.xml
index c7eeea4da..09fe650ea 100644
--- a/app/src/main/res/layout/fragment_find_book.xml
+++ b/app/src/main/res/layout/fragment_find_book.xml
@@ -1,9 +1,10 @@
 <?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:orientation="vertical"
-              android:layout_width="match_parent"
-              android:layout_height="match_parent">
+<androidx.constraintlayout.widget.ConstraintLayout
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
+        android:orientation="vertical"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
 
     <io.legado.app.ui.widget.TitleBar
             android:id="@+id/title_bar"
@@ -13,4 +14,5 @@
             app:layout_constraintTop_toTopOf="parent"
             app:title="@string/find"/>
 
-</LinearLayout>
\ No newline at end of file
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_my_config.xml b/app/src/main/res/layout/fragment_my_config.xml
index 9fe7b70f7..5ef6b80c9 100644
--- a/app/src/main/res/layout/fragment_my_config.xml
+++ b/app/src/main/res/layout/fragment_my_config.xml
@@ -1,8 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout 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">
+<androidx.constraintlayout.widget.ConstraintLayout
+        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">
 
     <io.legado.app.ui.widget.TitleBar
             android:id="@+id/title_bar"