diff --git a/.idea/copyright/dingyi_apache_2_0.xml b/.idea/copyright/dingyi_apache_2_0.xml
new file mode 100644
index 0000000..09ca1f3
--- /dev/null
+++ b/.idea/copyright/dingyi_apache_2_0.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="TreeView - An TreeView implement in Android with RecyclerView written in kotlin.&#10; https://github.com/dingyi222666/TreeView&#10;&#10;Copyright (C) 2023-&amp;#36;originalComment.match(&quot;Copyright \(c\) (\d+)&quot;, 1, &quot;-&quot;, &quot;&amp;#36;today.year&quot;)&amp;#36;today.year. dingyi222666@foxmail.com&#10;&#10;Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);&#10;you may not use this file except in compliance with the License.&#10;You may obtain a copy of the License at&#10;&#10; http://www.apache.org/licenses/LICENSE-2.0&#10;&#10;Unless required by applicable law or agreed to in writing, software&#10;distributed under the License is distributed on an &quot;AS IS&quot; BASIS,&#10;WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.&#10;See the License for the specific language governing permissions and&#10;limitations under the License." />
+    <option name="myName" value="dingyi-apache-2.0" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/copyright/profiles_settings.xml b/.idea/copyright/profiles_settings.xml
new file mode 100644
index 0000000..7ba8b9e
--- /dev/null
+++ b/.idea/copyright/profiles_settings.xml
@@ -0,0 +1,3 @@
+<component name="CopyrightManager">
+  <settings default="dingyi-apache-2.0" />
+</component>
\ No newline at end of file
diff --git a/app/src/main/kotlin/com/dingyi/treeview/FileActivity.kt b/app/src/main/kotlin/com/dingyi/treeview/FileActivity.kt
index 301b9e5..1d67a81 100644
--- a/app/src/main/kotlin/com/dingyi/treeview/FileActivity.kt
+++ b/app/src/main/kotlin/com/dingyi/treeview/FileActivity.kt
@@ -1,3 +1,22 @@
+/*
+ * TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+ *  https://github.com/dingyi222666/TreeView
+ *
+ * Copyright (C) 2023-2024. dingyi222666@foxmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package com.dingyi.treeview
 
 import android.content.Intent
diff --git a/app/src/main/kotlin/com/dingyi/treeview/MainActivity.kt b/app/src/main/kotlin/com/dingyi/treeview/MainActivity.kt
index 2ddd4d4..93a85a8 100644
--- a/app/src/main/kotlin/com/dingyi/treeview/MainActivity.kt
+++ b/app/src/main/kotlin/com/dingyi/treeview/MainActivity.kt
@@ -1,3 +1,22 @@
+/*
+ * TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+ *  https://github.com/dingyi222666/TreeView
+ *
+ * Copyright (C) 2023-2024. dingyi222666@foxmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package com.dingyi.treeview
 
 import android.content.Intent
diff --git a/app/src/main/kotlin/com/dingyi/treeview/MainApplication.kt b/app/src/main/kotlin/com/dingyi/treeview/MainApplication.kt
index 1178811..bd9e245 100644
--- a/app/src/main/kotlin/com/dingyi/treeview/MainApplication.kt
+++ b/app/src/main/kotlin/com/dingyi/treeview/MainApplication.kt
@@ -1,3 +1,22 @@
+/*
+ * TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+ *  https://github.com/dingyi222666/TreeView
+ *
+ * Copyright (C) 2023-2024. dingyi222666@foxmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package com.dingyi.treeview
 
 import android.app.Application
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a3b7f94 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,22 @@
+<!--
+  ~ TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+  ~  https://github.com/dingyi222666/TreeView
+  ~
+  ~ Copyright (C) 2023-2024. dingyi222666@foxmail.com
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~  http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/baseline_folder_24.xml b/app/src/main/res/drawable/baseline_folder_24.xml
index 7e0d7f5..77facc8 100644
--- a/app/src/main/res/drawable/baseline_folder_24.xml
+++ b/app/src/main/res/drawable/baseline_folder_24.xml
@@ -1,3 +1,22 @@
+<!--
+  ~ TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+  ~  https://github.com/dingyi222666/TreeView
+  ~
+  ~ Copyright (C) 2023-2024. dingyi222666@foxmail.com
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~  http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
 <vector android:height="24dp" android:tint="?colorOnBackground"
     android:viewportHeight="24" android:viewportWidth="24"
     android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
diff --git a/app/src/main/res/drawable/baseline_insert_drive_file_24.xml b/app/src/main/res/drawable/baseline_insert_drive_file_24.xml
index 5927a7c..31e730b 100644
--- a/app/src/main/res/drawable/baseline_insert_drive_file_24.xml
+++ b/app/src/main/res/drawable/baseline_insert_drive_file_24.xml
@@ -1,3 +1,22 @@
+<!--
+  ~ TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+  ~  https://github.com/dingyi222666/TreeView
+  ~
+  ~ Copyright (C) 2023-2024. dingyi222666@foxmail.com
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~  http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
 <vector android:height="24dp" android:tint="?colorOnBackground"
     android:viewportHeight="24" android:viewportWidth="24"
     android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
diff --git a/app/src/main/res/drawable/baseline_keyboard_arrow_right_24.xml b/app/src/main/res/drawable/baseline_keyboard_arrow_right_24.xml
index ec3e595..63b6fba 100644
--- a/app/src/main/res/drawable/baseline_keyboard_arrow_right_24.xml
+++ b/app/src/main/res/drawable/baseline_keyboard_arrow_right_24.xml
@@ -1,3 +1,22 @@
+<!--
+  ~ TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+  ~  https://github.com/dingyi222666/TreeView
+  ~
+  ~ Copyright (C) 2023-2024. dingyi222666@foxmail.com
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~  http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
 <vector android:height="24dp" android:tint="?colorOnBackground"
     android:viewportHeight="24" android:viewportWidth="24"
     android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..dae6810 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,23 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+  ~  https://github.com/dingyi222666/TreeView
+  ~
+  ~ Copyright (C) 2023-2024. dingyi222666@foxmail.com
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~  http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 17d0843..99e0832 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,23 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+  ~  https://github.com/dingyi222666/TreeView
+  ~
+  ~ Copyright (C) 2023-2024. dingyi222666@foxmail.com
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~  http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
 <androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/item_dir.xml b/app/src/main/res/layout/item_dir.xml
index 1941c2b..080c93d 100644
--- a/app/src/main/res/layout/item_dir.xml
+++ b/app/src/main/res/layout/item_dir.xml
@@ -1,4 +1,23 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+  ~  https://github.com/dingyi222666/TreeView
+  ~
+  ~ Copyright (C) 2023-2024. dingyi222666@foxmail.com
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~  http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/item_file.xml b/app/src/main/res/layout/item_file.xml
index df0d56d..0b32038 100644
--- a/app/src/main/res/layout/item_file.xml
+++ b/app/src/main/res/layout/item_file.xml
@@ -1,4 +1,23 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+  ~  https://github.com/dingyi222666/TreeView
+  ~
+  ~ Copyright (C) 2023-2024. dingyi222666@foxmail.com
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~  http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/menu/file.xml b/app/src/main/res/menu/file.xml
index 453ca65..2ff1637 100644
--- a/app/src/main/res/menu/file.xml
+++ b/app/src/main/res/menu/file.xml
@@ -1,4 +1,23 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+  ~  https://github.com/dingyi222666/TreeView
+  ~
+  ~ Copyright (C) 2023-2024. dingyi222666@foxmail.com
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~  http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
 <menu xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto">
     <item
diff --git a/app/src/main/res/menu/main.xml b/app/src/main/res/menu/main.xml
index 409789e..8cc11fd 100644
--- a/app/src/main/res/menu/main.xml
+++ b/app/src/main/res/menu/main.xml
@@ -1,4 +1,23 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+  ~  https://github.com/dingyi222666/TreeView
+  ~
+  ~ Copyright (C) 2023-2024. dingyi222666@foxmail.com
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~  http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
 <menu xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto">
 
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
index 6f3b755..39ecfa1 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -1,4 +1,23 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+  ~  https://github.com/dingyi222666/TreeView
+  ~
+  ~ Copyright (C) 2023-2024. dingyi222666@foxmail.com
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~  http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
index 6f3b755..39ecfa1 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -1,4 +1,23 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+  ~  https://github.com/dingyi222666/TreeView
+  ~
+  ~ Copyright (C) 2023-2024. dingyi222666@foxmail.com
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~  http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index f8c6127..c9d5525 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -1,4 +1,23 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+  ~  https://github.com/dingyi222666/TreeView
+  ~
+  ~ Copyright (C) 2023-2024. dingyi222666@foxmail.com
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~  http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
 <resources>
     <color name="purple_200">#FFBB86FC</color>
     <color name="purple_500">#FF6200EE</color>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 8a89a82..6a9116f 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,22 @@
+<!--
+  ~ TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+  ~  https://github.com/dingyi222666/TreeView
+  ~
+  ~ Copyright (C) 2023-2024. dingyi222666@foxmail.com
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~  http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
 <resources>
     <string name="app_name">TreeView</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml
index 45b04c2..5242571 100644
--- a/app/src/main/res/values/themes.xml
+++ b/app/src/main/res/values/themes.xml
@@ -1,3 +1,22 @@
+<!--
+  ~ TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+  ~  https://github.com/dingyi222666/TreeView
+  ~
+  ~ Copyright (C) 2023-2024. dingyi222666@foxmail.com
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~  http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
     <style name="Theme.TreeView" parent="Theme.Material3.DynamicColors.Light.NoActionBar">
diff --git a/app/src/main/res/xml/backup_rules.xml b/app/src/main/res/xml/backup_rules.xml
index fa0f996..70473fc 100644
--- a/app/src/main/res/xml/backup_rules.xml
+++ b/app/src/main/res/xml/backup_rules.xml
@@ -1,4 +1,23 @@
 <?xml version="1.0" encoding="utf-8"?><!--
+  ~ TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+  ~  https://github.com/dingyi222666/TreeView
+  ~
+  ~ Copyright (C) 2023-2024. dingyi222666@foxmail.com
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~  http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
+<!--
    Sample backup rules file; uncomment and customize as necessary.
    See https://developer.android.com/guide/topics/data/autobackup
    for details.
diff --git a/app/src/main/res/xml/data_extraction_rules.xml b/app/src/main/res/xml/data_extraction_rules.xml
index 9ee9997..c129cbe 100644
--- a/app/src/main/res/xml/data_extraction_rules.xml
+++ b/app/src/main/res/xml/data_extraction_rules.xml
@@ -1,4 +1,23 @@
 <?xml version="1.0" encoding="utf-8"?><!--
+  ~ TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+  ~  https://github.com/dingyi222666/TreeView
+  ~
+  ~ Copyright (C) 2023-2024. dingyi222666@foxmail.com
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~  http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
+<!--
    Sample data extraction rules file; uncomment and customize as necessary.
    See https://developer.android.com/about/versions/12/backup-restore#xml-changes
    for details.
diff --git a/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/AbstractTree.kt b/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/AbstractTree.kt
index ea67af6..601b207 100644
--- a/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/AbstractTree.kt
+++ b/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/AbstractTree.kt
@@ -1,3 +1,22 @@
+/*
+ * TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+ *  https://github.com/dingyi222666/TreeView
+ *
+ * Copyright (C) 2023-2024. dingyi222666@foxmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package io.github.dingyi222666.view.treeview
 
 import androidx.annotation.CallSuper
diff --git a/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/TreeView.kt b/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/TreeView.kt
index 6e70a6e..2e3addd 100644
--- a/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/TreeView.kt
+++ b/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/TreeView.kt
@@ -1,3 +1,22 @@
+/*
+ * TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+ *  https://github.com/dingyi222666/TreeView
+ *
+ * Copyright (C) 2023-2024. dingyi222666@foxmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package io.github.dingyi222666.view.treeview
 
 import android.annotation.SuppressLint
diff --git a/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/dataSource.kt b/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/dataSource.kt
index 87c9d2e..41f5d15 100644
--- a/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/dataSource.kt
+++ b/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/dataSource.kt
@@ -1,3 +1,22 @@
+/*
+ * TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+ *  https://github.com/dingyi222666/TreeView
+ *
+ * Copyright (C) 2023-2024. dingyi222666@foxmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package io.github.dingyi222666.view.treeview
 
 import android.util.SparseArray
diff --git a/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/multimaps.kt b/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/multimaps.kt
index 89d3e0e..144f85e 100644
--- a/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/multimaps.kt
+++ b/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/multimaps.kt
@@ -1,3 +1,22 @@
+/*
+ * TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+ *  https://github.com/dingyi222666/TreeView
+ *
+ * Copyright (C) 2023-2024. dingyi222666@foxmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package io.github.dingyi222666.view.treeview
 
 import java.util.LinkedList
diff --git a/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/treeNodes.kt b/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/treeNodes.kt
index 87d4ecd..135baaa 100644
--- a/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/treeNodes.kt
+++ b/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/treeNodes.kt
@@ -1,3 +1,22 @@
+/*
+ * TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+ *  https://github.com/dingyi222666/TreeView
+ *
+ * Copyright (C) 2023-2024. dingyi222666@foxmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package io.github.dingyi222666.view.treeview
 
 
diff --git a/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/treeVisitors.kt b/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/treeVisitors.kt
index edcd1f7..aeb8ad3 100644
--- a/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/treeVisitors.kt
+++ b/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/treeVisitors.kt
@@ -1,3 +1,22 @@
+/*
+ * TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+ *  https://github.com/dingyi222666/TreeView
+ *
+ * Copyright (C) 2023-2024. dingyi222666@foxmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package io.github.dingyi222666.view.treeview
 
 
diff --git a/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/trees.kt b/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/trees.kt
index 11f8df7..1a48792 100644
--- a/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/trees.kt
+++ b/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/trees.kt
@@ -1,3 +1,22 @@
+/*
+ * TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+ *  https://github.com/dingyi222666/TreeView
+ *
+ * Copyright (C) 2023-2024. dingyi222666@foxmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package io.github.dingyi222666.view.treeview
 
 import android.util.SparseArray
diff --git a/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/utils.kt b/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/utils.kt
index 49f8bb8..2f0bdae 100644
--- a/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/utils.kt
+++ b/treeview/src/main/kotlin/io/github/dingyi222666/view/treeview/utils.kt
@@ -1,3 +1,22 @@
+/*
+ * TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+ *  https://github.com/dingyi222666/TreeView
+ *
+ * Copyright (C) 2023-2024. dingyi222666@foxmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package io.github.dingyi222666.view.treeview
 
 import android.view.MotionEvent
diff --git a/treeview/src/main/res/values/ids.xml b/treeview/src/main/res/values/ids.xml
index 15adb93..86f376c 100644
--- a/treeview/src/main/res/values/ids.xml
+++ b/treeview/src/main/res/values/ids.xml
@@ -1,4 +1,23 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ TreeView - An TreeView implement in Android with RecyclerView written in kotlin.
+  ~  https://github.com/dingyi222666/TreeView
+  ~
+  ~ Copyright (C) 2023-2024. dingyi222666@foxmail.com
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~  http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
 <resources>
     <item name="tag_measured_width" type="id"></item>
 </resources>
\ No newline at end of file