Question

I am now trying to improve my programming skills and specially I would like to now how you debug those situations where the app lags a bit. I tried to move most of the critical parts to threads but still I get some ANR. I guess my app is leaking memory somewhere.

So, how to debug this?

Answer 1

I think you should spend some time reading this http://developer.android.com/reference/android/os/StrictMode.html

From Strict Mode reference page:

StrictMode is most commonly used to
catch accidental disk or network
access on the application’s main
thread, where UI operations are
received and animations take place.
Keeping disk and network operations
off the main thread makes for much
smoother, more responsive
applications. By keeping your
application’s main thread responsive,
you also prevent ANR dialogs from
being shown to users.