Two instances of my android application are running…How to avoid this?

Question

Here is my problem -

1. I copied my .apk file onto phone memory card and launch my application clicking on it and it allows me to install my application.I ins

Answer 1

what do your OnPause, OnResume and OnCreate? I will bet money you are not saving anything OnPause, and starting a new instance all the time via OnCreate.

You should read the notes on Activity Lifecycles.