Optimization of UI (.xml files) and java codes in android

when I am going to develop an android application. For better performance of my application what are necessary steps. In anoth开发者_运维知识库er word how to optimize my codes and .xml files, in best way. And what are steps to remember when I am going to use huge set of variables.

Thank you!

That's a pretty broad question. I suggest going through some of the articles in the developer resources. They cover many topics, from avoiding memory leaks to reusing XML layouts.