A very useful directory tree, expand the demo program.

TreeRecyclerView-master
.......................\.classpath
.......................\.gitignore
.......................\.project
.......................\AndroidManifest.xml
.......................\demo
.......................\....\demo.gif
.......................\ic_launcher-web.png
.......................\libs
.......................\....\android-support-v4.jar
.......................\....\android-support-v7-recyclerview.jar
.......................\proguard-project.txt
.......................\project.properties
.......................\readme.md
.......................\res
.......................\...\drawable-hdpi
.......................\...\.............\expand.png
.......................\...\.............\file.png
.......................\...\.............\folder.png
.......................\...\.............\ic_launcher.png
.......................\...\drawable-mdpi
.......................\...\.............\ic_launcher.png
.......................\...\drawable-xhdpi
.......................\...\..............\ic_launcher.png
.......................\...\drawable-xxhdpi
.......................\...\...............\ic_launcher.png
.......................\...\layout
.......................\...\......\activity_main.xml
.......................\...\......\item_recycler_child.xml
.......................\...\......\item_recycler_parent.xml
.......................\...\values-w820dp
.......................\...\.............\dimens.xml
.......................\...\values
.......................\...\......\dimens.xml
.......................\...\......\ids.xml
.......................\...\......\strings.xml
.......................\src
.......................\...\net
.......................\...\...\mobctrl
.......................\...\...\.......\activity
.......................\...\...\.......\........\MainActivity.java
.......................\...\...\.......\adapter
.......................\...\...\.......\.......\RecyclerAdapter.java
.......................\...\...\.......\interfaces
.......................\...\...\.......\..........\ItemDataClickListener.java
.......................\...\...\.......\..........\OnScrollToListener.java
.......................\...\...\.......\model
.......................\...\...\.......\.....\ItemData.java
.......................\...\...\.......\viewholder
.......................\...\...\.......\..........\BaseViewHolder.java
.......................\...\...\.......\..........\ChildViewHolder.java
.......................\...\...\.......\..........\ParentViewHolder.java

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