diff --git a/README.md b/README.md
index 4440932d0..5ad916589 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ Of course, you can continue to use the [2.x](https://github.com/CymChad/BaseRecy
 ## Demo
 ![](https://github.com/CymChad/BaseRecyclerViewAdapterHelper/blob/master/readme/demo.png)
 
-[国内下载地址](https://www.lanzous.com/i8ate4f)  
+[国内下载地址](https://www.lanzous.com/i9onlzc)  
 
 # proguard-rules.pro
 > 此资源库自带混淆规则，并且会自动导入，正常情况下无需手动导入。
diff --git a/app/build.gradle b/app/build.gradle
index b820c391d..65d8ae888 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -10,7 +10,7 @@ android {
         applicationId "com.chad.baserecyclerviewadapterhelper"
         minSdkVersion 16
         targetSdkVersion 28
-        versionCode 7
+        versionCode 9
         versionName "3.0"
     }
     buildTypes {
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/activity/HomeActivity.kt b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/activity/HomeActivity.kt
index 025f4d018..456c086bc 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/activity/HomeActivity.kt
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/activity/HomeActivity.kt
@@ -27,12 +27,6 @@ class HomeActivity : AppCompatActivity(), OnItemClickListener {
             val top = layoutInflater.inflate(R.layout.top_view, binding.recyclerView, false)
             addHeaderView(top)
             setOnItemClickListener(this@HomeActivity)
-//            setOnItemClickListener { adapter, _, position ->
-//                val item = adapter.data[position] as HomeEntity
-//                if (!item.isHeader) {
-//                    startActivity(Intent(this@HomeActivity, item.activity))
-//                }
-//            }
         }
     }
 
diff --git a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/adapter/HomeAdapter.kt b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/adapter/HomeAdapter.kt
index 3caa6c115..02e191750 100644
--- a/app/src/main/java/com/chad/baserecyclerviewadapterhelper/adapter/HomeAdapter.kt
+++ b/app/src/main/java/com/chad/baserecyclerviewadapterhelper/adapter/HomeAdapter.kt
@@ -19,6 +19,6 @@ class HomeAdapter(data: MutableList<HomeEntity>) :
 
     override fun convertHeader(helper: BaseViewHolder, item: HomeEntity) {
         helper.setGone(R.id.more, true)
-        helper.setText(R.id.header, item?.headerTitle)
+        helper.setText(R.id.header, item.headerTitle)
     }
 }
\ No newline at end of file
diff --git a/app/src/main/res/drawable/circle_primary_color.xml b/app/src/main/res/drawable/circle_primary_color.xml
deleted file mode 100644
index 9fe42bf81..000000000
--- a/app/src/main/res/drawable/circle_primary_color.xml
+++ /dev/null
@@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<shape xmlns:android="http://schemas.android.com/apk/res/android">
-
-    <corners android:radius="9999dp" />
-    <solid android:color="@color/white_text_color" />
-    <stroke android:color="@color/colorPrimary" android:width="1dp" />
-
-</shape>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_adapter_use.xml b/app/src/main/res/layout/activity_adapter_use.xml
index f5300a1c6..bdbc427fa 100644
--- a/app/src/main/res/layout/activity_adapter_use.xml
+++ b/app/src/main/res/layout/activity_adapter_use.xml
@@ -1,24 +1,23 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout style="@style/bg"
-              xmlns:android="http://schemas.android.com/apk/res/android"
-              xmlns:app="http://schemas.android.com/apk/res-auto">
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    style="@style/bg">
 
     <LinearLayout
         android:layout_width="match_parent"
         android:layout_height="48dp"
-        android:orientation="horizontal"
-        android:paddingLeft="@dimen/dp_10"
         android:background="@color/spinner_bg"
         android:gravity="center"
-        android:paddingRight="@dimen/dp_10"
-        >
+        android:orientation="horizontal"
+        android:paddingLeft="@dimen/dp_10"
+        android:paddingRight="@dimen/dp_10">
 
         <ImageView
+            android:id="@+id/img_back"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:padding="10dp"
-            android:id="@+id/img_back"
-            android:src="@mipmap/back"/>
+            android:src="@mipmap/back" />
 
         <com.jaredrummler.materialspinner.MaterialSpinner
             android:id="@+id/spinner"
@@ -28,8 +27,7 @@
             android:background="@null"
             app:ms_background_color="@color/spinner_bg"
             app:ms_hide_arrow="false"
-            app:ms_text_color="#ffffff"
-            />
+            app:ms_text_color="#ffffff" />
 
         <LinearLayout
             android:layout_width="match_parent"
@@ -43,19 +41,19 @@
                 android:layout_height="wrap_content"
                 android:text="IsFirstOnly"
                 android:textColor="@color/new_text_color"
-                android:textSize="16sp"/>
+                android:textSize="16sp" />
 
             <com.kyleduo.switchbutton.SwitchButton
                 android:id="@+id/switch_button"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:layout_marginLeft="12dp"
+                android:textColor="@drawable/custom_text_state_color"
                 app:kswTextOff="false"
                 app:kswTextOn="true"
-                android:textColor="@drawable/custom_text_state_color"
-                app:kswThumbDrawable="@drawable/thumb_drawable"
                 app:kswThumbColor="#555771"
-                app:kswTintColor="#00ddB6"/>
+                app:kswThumbDrawable="@drawable/thumb_drawable"
+                app:kswTintColor="#00ddB6" />
 
         </LinearLayout>
     </LinearLayout>
@@ -65,6 +63,6 @@
         android:id="@+id/rv_list"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:fadingEdge="none"/>
+        android:fadingEdge="none" />
 
 </LinearLayout>
diff --git a/app/src/main/res/layout/activity_expandable_item_use.xml b/app/src/main/res/layout/activity_expandable_item_use.xml
deleted file mode 100644
index eb361ddba..000000000
--- a/app/src/main/res/layout/activity_expandable_item_use.xml
+++ /dev/null
@@ -1,23 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:background="@color/bg">
-
-    <androidx.recyclerview.widget.RecyclerView
-        android:id="@+id/rv"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent" />
-
-    <androidx.appcompat.widget.AppCompatCheckBox
-        android:id="@+id/cbOnlyExpandOne"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_gravity="bottom|end"
-        android:layout_margin="20dp"
-        android:background="@drawable/circle_primary_color"
-        android:padding="8dp"
-        android:text="Only expand one"
-        android:textColor="@color/colorPrimary" />
-
-</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_test.xml b/app/src/main/res/layout/activity_test.xml
deleted file mode 100644
index df66e0d59..000000000
--- a/app/src/main/res/layout/activity_test.xml
+++ /dev/null
@@ -1,68 +0,0 @@
-<?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">
-
-    <androidx.recyclerview.widget.RecyclerView
-        android:id="@+id/diff_rv"
-        android:layout_width="match_parent"
-        android:layout_height="0dp"
-        android:layout_weight="1"
-        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager" />
-
-    <LinearLayout
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_marginBottom="4dp"
-        android:gravity="center_horizontal"
-        android:orientation="vertical"
-        android:paddingTop="4dp">
-
-
-        <LinearLayout
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:gravity="center"
-            android:orientation="horizontal">
-
-            <Button
-                android:id="@+id/item_change_btn"
-                android:layout_width="wrap_content"
-                android:layout_height="40dp"
-                android:background="@drawable/touch_bg"
-                android:paddingLeft="6dp"
-                android:paddingRight="6dp"
-                android:text="Change Item"
-                android:textAllCaps="false"
-                android:textColor="@color/new_text_color" />
-
-            <Button
-                android:id="@+id/async_change_btn"
-                android:layout_width="wrap_content"
-                android:layout_height="40dp"
-                android:layout_marginLeft="16dp"
-                android:background="@drawable/touch_bg"
-                android:paddingLeft="6dp"
-                android:paddingRight="6dp"
-                android:text="Async Change Item"
-                android:textAllCaps="false"
-                android:textColor="@color/new_text_color" />
-
-        </LinearLayout>
-
-        <Button
-            android:id="@+id/notify_change_btn"
-            android:layout_width="wrap_content"
-            android:layout_height="40dp"
-            android:layout_marginTop="4dp"
-            android:background="@drawable/touch_bg"
-            android:paddingLeft="6dp"
-            android:paddingRight="6dp"
-            android:text="Item 0 notifyItemChanged (payload) "
-            android:textAllCaps="false"
-            android:textColor="@color/new_text_color" />
-    </LinearLayout>
-
-</LinearLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/item_expandable_lv0.xml b/app/src/main/res/layout/item_expandable_lv0.xml
deleted file mode 100644
index 5cf9d88c0..000000000
--- a/app/src/main/res/layout/item_expandable_lv0.xml
+++ /dev/null
@@ -1,42 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-              android:background="@android:color/white"
-              android:layout_width="match_parent"
-              android:layout_height="80dp"
-              android:orientation="horizontal"
-              android:gravity="center_vertical"
-              android:layout_marginBottom="1dp"
-    >
-    <ImageView
-        android:id="@+id/iv_head"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:src="@mipmap/head_img"
-        android:paddingLeft="20dp"
-        android:paddingRight="20dp"
-        />
-    <TextView
-        android:id="@+id/title"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:textSize="18sp"
-        android:textStyle="bold"
-        android:textColor="@android:color/black"
-        android:layout_weight="1"
-        />
-    <TextView
-        android:id="@+id/sub_title"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:textSize="16sp"
-        android:textColor="@android:color/black"
-        android:visibility="gone"
-        />
-    <ImageView
-        android:id="@+id/iv"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_gravity="right|center"
-        android:layout_weight="3"
-        android:src="@mipmap/arrow_r"/>
-</LinearLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/item_expandable_lv1.xml b/app/src/main/res/layout/item_expandable_lv1.xml
deleted file mode 100644
index f169b907a..000000000
--- a/app/src/main/res/layout/item_expandable_lv1.xml
+++ /dev/null
@@ -1,41 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-              android:background="@android:color/white"
-              android:layout_width="match_parent"
-              android:layout_height="80dp"
-              android:orientation="horizontal"
-              android:gravity="center_vertical"
-              android:layout_marginBottom="1dp"
-              android:paddingLeft="10dp"
-    >
-    <ImageView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:src="@mipmap/head_img_1"
-        android:paddingLeft="20dp"
-        android:paddingRight="20dp"/>
-    <TextView
-        android:id="@+id/title"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:textSize="18sp"
-        android:textStyle="bold"
-        android:textColor="@android:color/black"
-        android:layout_weight="1"
-        />
-    <TextView
-        android:id="@+id/sub_title"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:textSize="16sp"
-        android:textColor="@android:color/black"
-        android:visibility="gone"
-        />
-    <ImageView
-        android:id="@+id/iv"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_gravity="right|center"
-        android:layout_weight="3"
-        android:src="@mipmap/arrow_r"/>
-</LinearLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/item_expandable_lv2.xml b/app/src/main/res/layout/item_expandable_lv2.xml
deleted file mode 100644
index b9c680419..000000000
--- a/app/src/main/res/layout/item_expandable_lv2.xml
+++ /dev/null
@@ -1,23 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-              android:background="@android:color/white"
-              android:layout_width="match_parent"
-              android:layout_height="80dp"
-              android:orientation="horizontal"
-              android:gravity="center_vertical"
-              android:layout_marginBottom="1dp"
-              android:layout_marginRight="1dp"
-              android:layout_marginLeft="1dp"
-              android:paddingLeft="10dp"
-    >
-    <TextView
-        android:id="@+id/tv"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:textSize="18sp"
-        android:textStyle="bold"
-        android:textColor="@android:color/black"
-        android:layout_weight="1"
-        />
-
-</LinearLayout>
\ No newline at end of file
diff --git a/readme/demo.png b/readme/demo.png
index 0dadad33c..c58c76a1a 100644
Binary files a/readme/demo.png and b/readme/demo.png differ