I recently wrote an article explaining how to track down and fix performance issues in Android application. This article was by no means a complete reference on how to solve all performance issues and focused on a particular set of issues caused by overdraw.
To help you better understand how to fix overdraw issues, I would like to invite you to download a small Android application I wrote (click File > Download to download the entire archieve.)
Your goal will be to use the tools described in my previous article to find and fix the 3 main overdraw issues in the app. If you do it right, you should turn the image on the left to the image on the right: