Rotating text is an Android library that can be used to make text switching painless and beautiful, with the use of interpolators, typefaces and more customisations.
The library automatically adds GET_ACCOUNTS permission into your Manifest. For Android Marshmallow, the library also handles runtime permissions automagically.
Simple implementation of a Float Labeled EditText: An Android ViewGroup which uses a child EditText and puts the hint on top of the EditText when it is populated with text.
ExpandableTextView is an Android library that allows developers to easily create an TextView which can expand/collapse just like the Google Play's app description.