android tree structure to achieve a list, you can add two, three or more levels of nodes

TreeTest
........\.classpath
........\.project
........\AndroidManifest.xml
........\bin
........\...\AndroidManifest.xml
........\...\classes
........\...\.......\com
........\...\.......\...\gao
........\...\.......\...\...\tree
........\...\.......\...\...\....\BuildConfig.class
........\...\.......\...\...\....\PDFOutlineElement.class
........\...\.......\...\...\....\R$attr.class
........\...\.......\...\...\....\R$drawable.class
........\...\.......\...\...\....\R$id.class
........\...\.......\...\...\....\R$layout.class
........\...\.......\...\...\....\R$string.class
........\...\.......\...\...\....\R.class
........\...\.......\...\...\....\TreeView$TreeViewAdapter$ViewHolder.class
........\...\.......\...\...\....\TreeView$TreeViewAdapter.class
........\...\.......\...\...\....\TreeView.class
........\...\jarlist.cache
........\...\res
........\gen
........\...\com
........\...\...\gao
........\...\...\...\tree
........\...\...\...\....\BuildConfig.java
........\...\...\...\....\R.java
........\project.properties
........\res
........\...\drawable-hdpi
........\...\.............\icon.png
........\...\.............\outline_list_collapse.png
........\...\.............\outline_list_expand.png
........\...\drawable-ldpi
........\...\.............\icon.png
........\...\drawable-mdpi
........\...\.............\icon.png
........\...\.............\outline_list_collapse.png
........\...\.............\outline_list_expand.png
........\...\layout
........\...\......\outline.xml
........\...\values
........\...\......\strings.xml
........\src
........\...\com
........\...\...\gao
........\...\...\...\tree
........\...\...\...\....\PDFOutlineElement.java
........\...\...\...\....\TreeView.java

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