What are the most important improvements in Java code on Android?

Question

I'm just starting to program on Android.

What are the most expensive Java constructs you can avoid when programming an Android application?

Due to the fact that each algorithm is costly, but what about using method calls, object references, interfaces, collections, etc.? What should I avoid and what is “cheap” when I program speed?

Answer 1

Here you can find official recommendations: http://developer.android.com/guide/practices/design/performance.html

http://developer.android.com/guide/practices/design/responsiveness.html http://developer.android.com/guide/practices/design/seamlessness.html

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Answer 2

1) . , -.

2) Big Oh .