A list of QQ friends like to show, can expand, can fold, in android, ever more is a listview, although can realize display list, but in some cases, we still hope to use can be grouped and implement contract list, that is about to use android ExpandableListView

expandlistviewdemo
..................\.classpath
..................\.project
..................\AndroidManifest.xml
..................\assets
..................\bin
..................\...\AndroidManifest.xml
..................\...\classes
..................\...\.......\com
..................\...\.......\...\example
..................\...\.......\...\.......\expandlistviewdemo
..................\...\.......\...\.......\..................\BuildConfig.class
..................\...\.......\...\.......\..................\helper
..................\...\.......\...\.......\..................\......\ChildData.class
..................\...\.......\...\.......\..................\......\DataHolder.class
..................\...\.......\...\.......\..................\......\GroupData.class
..................\...\.......\...\.......\..................\......\ViewHolder.class
..................\...\.......\...\.......\..................\MainActivity$1.class
..................\...\.......\...\.......\..................\MainActivity$2.class
..................\...\.......\...\.......\..................\MainActivity$ExpandableListAdapter$1.class
..................\...\.......\...\.......\..................\MainActivity$ExpandableListAdapter$2.class
..................\...\.......\...\.......\..................\MainActivity$ExpandableListAdapter$ImageHolder.class
..................\...\.......\...\.......\..................\MainActivity$ExpandableListAdapter.class
..................\...\.......\...\.......\..................\MainActivity.class
..................\...\.......\...\.......\..................\R$attr.class
..................\...\.......\...\.......\..................\R$dimen.class
..................\...\.......\...\.......\..................\R$drawable.class
..................\...\.......\...\.......\..................\R$id.class
..................\...\.......\...\.......\..................\R$layout.class
..................\...\.......\...\.......\..................\R$menu.class
..................\...\.......\...\.......\..................\R$string.class
..................\...\.......\...\.......\..................\R$style.class
..................\...\.......\...\.......\..................\R.class
..................\...\.......\...\.......\..................\util
..................\...\.......\...\.......\..................\....\Utils.class
..................\...\.......\...\.......\..................\view
..................\...\.......\...\.......\..................\....\ChildView$1.class
..................\...\.......\...\.......\..................\....\ChildView$OnChildClickListener.class
..................\...\.......\...\.......\..................\....\ChildView.class
..................\...\.......\...\.......\..................\....\GroupView$1.class
..................\...\.......\...\.......\..................\....\GroupView$OnGroupClickListener.class
..................\...\.......\...\.......\..................\....\GroupView.class
..................\...\res
..................\gen
..................\...\com
..................\...\...\example
..................\...\...\.......\expandlistviewdemo
..................\...\...\.......\..................\BuildConfig.java
..................\...\...\.......\..................\R.java
..................\libs
..................\....\android-support-v4.jar
..................\proguard-project.txt
..................\project.properties
..................\res
..................\...\drawable-hdpi
..................\...\.............\ic_launcher.png
..................\...\drawable-ldpi
..................\...\drawable-mdpi
..................\...\.............\ic_launcher.png
..................\...\drawable-xhdpi
..................\...\..............\ic_launcher.png
..................\...\layout
..................\...\......\activity_main.xml
..................\...\......\child.xml
..................\...\......\group.xml
..................\...\menu
..................\...\....\main.xml
..................\...\values
..................\...\......\dimens.xml
..................\...\......\strings.x

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