diff --git a/app/src/main/java/io/legado/app/ui/replacerule/ReplaceRuleViewModel.java b/app/src/main/java/io/legado/app/ui/replacerule/ReplaceRuleViewModel.java
index fac35d61d..4755b3819 100644
--- a/app/src/main/java/io/legado/app/ui/replacerule/ReplaceRuleViewModel.java
+++ b/app/src/main/java/io/legado/app/ui/replacerule/ReplaceRuleViewModel.java
@@ -7,5 +7,6 @@ import org.jetbrains.annotations.NotNull;
 public class ReplaceRuleViewModel extends BaseViewModel {
     public ReplaceRuleViewModel(@NotNull Application application) {
         super(application);
+
     }
 }
diff --git a/app/src/main/java/io/legado/app/ui/widget/RotateLoading.kt b/app/src/main/java/io/legado/app/ui/widget/RotateLoading.kt
index 441efc6e0..eee218bf8 100644
--- a/app/src/main/java/io/legado/app/ui/widget/RotateLoading.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/RotateLoading.kt
@@ -9,10 +9,11 @@ import android.graphics.Color
 import android.graphics.Paint
 import android.graphics.RectF
 import android.util.AttributeSet
-import android.util.TypedValue
 import android.view.View
 import android.view.animation.LinearInterpolator
+import androidx.core.view.isVisible
 import io.legado.app.R
+import io.legado.app.utils.dp
 
 /**
  * RotateLoading
@@ -59,8 +60,8 @@ class RotateLoading : View {
 
     private fun initView(context: Context, attrs: AttributeSet?) {
         loadingColor = Color.WHITE
-        thisWidth = dpToPx(context, DEFAULT_WIDTH.toFloat())
-        shadowPosition = dpToPx(getContext(), DEFAULT_SHADOW_POSITION.toFloat())
+        thisWidth = DEFAULT_WIDTH.dp
+        shadowPosition = DEFAULT_SHADOW_POSITION.dp
         speedOfDegree = DEFAULT_SPEED_OF_DEGREE
 
         if (null != attrs) {
@@ -68,7 +69,7 @@ class RotateLoading : View {
             loadingColor = typedArray.getColor(R.styleable.RotateLoading_loading_color, Color.WHITE)
             thisWidth = typedArray.getDimensionPixelSize(
                 R.styleable.RotateLoading_loading_width,
-                dpToPx(context, DEFAULT_WIDTH.toFloat())
+                DEFAULT_WIDTH.dp
             )
             shadowPosition = typedArray.getInt(R.styleable.RotateLoading_shadow_position, DEFAULT_SHADOW_POSITION)
             speedOfDegree = typedArray.getInt(R.styleable.RotateLoading_loading_speed, DEFAULT_SPEED_OF_DEGREE)
@@ -145,13 +146,29 @@ class RotateLoading : View {
         }
     }
 
-    fun start() {
+    override fun onAttachedToWindow() {
+        super.onAttachedToWindow()
+        if (isVisible) {
+            start()
+        }
+    }
+
+    override fun onVisibilityChanged(changedView: View, visibility: Int) {
+        super.onVisibilityChanged(changedView, visibility)
+        if (visibility == VISIBLE) {
+            start()
+        } else {
+            stop()
+        }
+    }
+
+    private fun start() {
         startAnimator()
         isStart = true
         invalidate()
     }
 
-    fun stop() {
+    private fun stop() {
         stopAnimator()
         invalidate()
     }
@@ -197,16 +214,11 @@ class RotateLoading : View {
         animatorSet.start()
     }
 
-
-    fun dpToPx(context: Context, dpVal: Float): Int {
-        return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dpVal, context.resources.displayMetrics).toInt()
-    }
-
     companion object {
 
-        private val DEFAULT_WIDTH = 6
-        private val DEFAULT_SHADOW_POSITION = 2
-        private val DEFAULT_SPEED_OF_DEGREE = 10
+        private const val DEFAULT_WIDTH = 6
+        private const val DEFAULT_SHADOW_POSITION = 2
+        private const val DEFAULT_SPEED_OF_DEGREE = 10
     }
 
 }
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_search.xml b/app/src/main/res/layout/activity_search.xml
index d5e31a0c7..3837883c7 100644
--- a/app/src/main/res/layout/activity_search.xml
+++ b/app/src/main/res/layout/activity_search.xml
@@ -1,29 +1,31 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    tools:context="io.legado.app.ui.search.SearchActivity">
+<androidx.constraintlayout.widget.ConstraintLayout
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:tools="http://schemas.android.com/tools"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        tools:context="io.legado.app.ui.search.SearchActivity">
 
     <io.legado.app.ui.widget.TitleBar
-        android:id="@+id/title_bar"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        app:layout_constraintTop_toTopOf="parent"
-        app:title="搜索" />
+            android:id="@+id/title_bar"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            app:layout_constraintTop_toTopOf="parent"
+            app:title="搜索"/>
 
     <io.legado.app.ui.widget.dynamiclayout.DynamicFrameLayout
-        android:layout_width="match_parent"
-        android:layout_height="0dp"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintTop_toBottomOf="@id/title_bar">
+            android:id="@+id/content_view"
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/title_bar">
 
 
         <androidx.recyclerview.widget.RecyclerView
-            android:id="@+id/rv_search_list"
-            android:layout_width="match_parent"
-            android:layout_height="match_parent" />
+                android:id="@+id/rv_search_list"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"/>
 
 
     </io.legado.app.ui.widget.dynamiclayout.DynamicFrameLayout>
diff --git a/app/src/main/res/layout/fragment_bookshelf.xml b/app/src/main/res/layout/fragment_bookshelf.xml
index b7be3a24d..e018605d4 100644
--- a/app/src/main/res/layout/fragment_bookshelf.xml
+++ b/app/src/main/res/layout/fragment_bookshelf.xml
@@ -1,24 +1,24 @@
 <?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">
+              xmlns:app="http://schemas.android.com/apk/res-auto"
+              android:layout_width="match_parent"
+              android:layout_height="match_parent"
+              android:orientation="vertical">
 
     <io.legado.app.ui.widget.TitleBar
-        android:id="@+id/title_bar"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        app:attachToActivity="false"
-        app:title="@string/bookshelf" />
-
+            android:id="@+id/title_bar"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            app:attachToActivity="false"
+            app:title="@string/bookshelf"/>
+    
     <androidx.recyclerview.widget.RecyclerView
-        android:id="@+id/rv_book_group"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content" />
+            android:id="@+id/rv_book_group"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"/>
 
     <androidx.recyclerview.widget.RecyclerView
-        android:id="@+id/rv_bookshelf"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent" />
+            android:id="@+id/rv_bookshelf"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"/>
 </LinearLayout>
\ No newline at end of file