I saw Flurry and Google-Analytics are good choices, what tool is more powerful and why?
Using google analytics for android has too many advantages. In case you have a service which is available on internet ,android and iPhone, you can see the consolidated data of all these on a single page. Also, the API is very simple and use of custom variables can be done to track the events in the application. Check out their official page at http://code.google.com/mobile/analytics/docs/android/