UI design in android apps

I am new to android programming and still working on how to make my app more presentable.I want to make the LOGIN page of my app a bit more attractive. I know all the design functionalities of android studios. I need help to start off with the UI and UX designs for android apps. Can anyone please suggest me a software or any other source for UI designing of android apps that could give me a head start to make my Login page more presentable?