This is a change Background Or TextColor Selector support library, with which you can directly specify the Background to be displayed in different states or TextColor Layout xml, such as clicking the button effect, the conventional practice is to create Selector xml file in drawable directory but when the project becomes larger when the file back to the directory Selector cause more and more difficult to maintain and achieve the Library can easily solve these problems, and can also achieve a lot Shape effects can be achieved, if you are using process have any questions or suggestions, please send an email to my email below, thank you!