DoubleTapLikeView is an extension of RelativeLayout, and it works exactly same as ImageView in Instagram.
It is an Android Open Source library that implements an expand-by-sliding logic for a top or a bottom View in a vertical two view composition. It supports Android SDK 2.1 (Eclair) as minimum.
ExpandablePanel library brings a custom view class called ExpandablePanelView to the final user. It implements the needed logic for integrating the expandable logic into your own Android application. Use listeners to implement a response for opening/shrinking events, and combine any of custom attributes to customize a behaviour.
Android Library to help you with your runtime Permissions.