There are lots of website pages in the network. Which one is the best and suited for your application? Search it on Google or make your life easier by finding the worked projects and complete tutorials below. Good luck!
Some useful links for learning and developments of your android application.
Store and use files in Assets
https://xjaphx.wordpress.com/2011/10/02/store-and-use-files-in-assets/
Method to play sound
http://blog.kerul.net/2013/09/playsound-method-to-play-mp3-on-android.html
Change to next screen
http://www.mkyong.com/android/android-activity-from-one-screen-to-another-screen/
Button...
