android - get nullpointer using getLocalActivityManager().getActivity(tag) -

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i'm using tabactivity implement tabs in project , want communicate activities of tabs , invoke methods tabactivity , use method below:

coachactivity activity=(coachactivity) getlocalactivitymanager().getactivity(mtabhost.getcurrenttabtag());

but activity null. coachactivity tab1 activity.

my code bit long don't post here. double checked , i'm sure problem isn't setup of tabs. set current tab , checked coachactivity created.


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