android converting activities to fragments -

i have made nice app whole bunch of activities , needed navigation drawer , found out need have 1 activity whole app , individual different screens should fragments inserted @ runtime.

my question :

how convert entire app use fragments instead of activities ? (eg: how preserve activity hierarchy , show main activity when user opens app , different actionbar each screen , etc...)

there no magic converter, need convert manually each activity extended fragment , add few must methods oncreateview fragment instead of setcontentview of activity.

regarding actionbars, sits on main activity need create callback events each fragment main activity in order control action bar.