File list (Check if you may need any files):
ActivityGroup
.............\.classpath
.............\.project
.............\AndroidManifest.xml
.............\assets
.............\bin
.............\...\ActivityGroup.apk
.............\...\classes
.............\...\classes.dex
.............\...\.......\org
.............\...\.......\...\hwq
.............\...\.......\...\...\activitygroup
.............\...\.......\...\...\.............\main
.............\...\.......\...\...\.............\....\ActivityA.class
.............\...\.......\...\...\.............\....\ActivityB.class
.............\...\.......\...\...\.............\....\ActivityC.class
.............\...\.......\...\...\.............\....\ActivityD.class
.............\...\.......\...\...\.............\....\ActivityGroupActivity$GridviewItemListener.class
.............\...\.......\...\...\.............\....\ActivityGroupActivity.class
.............\...\.......\...\...\.............\....\ImageAdapter.class
.............\...\.......\...\...\.............\....\R$attr.class
.............\...\.......\...\...\.............\....\R$drawable.class
.............\...\.......\...\...\.............\....\R$id.class
.............\...\.......\...\...\.............\....\R$layout.class
.............\...\.......\...\...\.............\....\R$string.class
.............\...\.......\...\...\.............\....\R.class
.............\...\res
.............\...\resources.ap_
.............\...\...\drawable-hdpi
.............\...\...\.............\ic_launcher.png
.............\...\...\.............\img1.png
.............\...\...\.............\img2.png
.............\...\...\.............\img3.png
.............\...\...\.............\img4.png
.............\...\...\drawable-ldpi
.............\...\...\.............\ic_launcher.png
.............\...\...\drawable-mdpi
.............\...\...\.............\ic_launcher.png
.............\gen
.............\...\org
.............\...\...\hwq
.............\...\...\...\activitygroup
.............\...\...\...\.............\main
.............\...\...\...\.............\....\R.java
.............\proguard.cfg
.............\project.properties
.............\res
.............\...\drawable
.............\...\drawable-hdpi
.............\...\.............\ic_launcher.png
.............\...\.............\img1.png
.............\...\.............\img2.png
.............\...\.............\img3.png
.............\...\.............\img4.png
.............\...\drawable-ldpi
.............\...\.............\ic_launcher.png
.............\...\drawable-mdpi
.............\...\.............\ic_launcher.png
.............\...\........\gridview_item.xml
.............\...\layout
.............\...\......\a.xml
.............\...\......\b.xml
.............\...\......\c.xml
.............\...\......\d.xml
.............\...\......\main.xml
.............\...\values
.............\...\......\strings.xml
.............\src
.............\...\org
.............\...\...\hwq
.............\...\...\...\activitygroup
.............\...\...\...\.............\main
.............\...\...\...\.............\....\ActivityA.java
.............\...\...\...\.............\....\ActivityB.java
.............\...\...\...\.............\....\ActivityC.java
.............\...\...\...\.............\....\ActivityD.java
.............\...\...\...\.............\....\ActivityGroupActivity.java
.............\...\...\...\.............\....\ImageAdapter.java