android - adding function into notification -

hello guys question pretty basic since noob in android development have ask , want add action inside notification , done using code

notification.addaction(r.mipmap.ic_launcher, "decrease", pendingintent); 

but can see added pendingintentin parameter , intent passing me particular activity (what supposed so) instead of passing user activity want perform action without opening app how can ?? , action increasing countervalue performing counter++

pending intent can used intent, without such ability run piece of code. can use dummy activity opened on notification click , exits after doing jobs.

however, using activities can annoying users flashes in , out on screen. might want use services not interrupt users , job simultaneously.

in case intentservice seems fit can used ease.

android document nicely describes service's lifecycle , methods of it's worth try.