android - Call method without a triggering condition -


i'm trying create program randomly , continuously display circles on screen change sizes. i've created method draw circles i'm not sure how call it. in past i've done buttons call method when clicked, don't know how call method out of blue. there 'main method equivalent' in android automatically run?

the oncreate method of activity showing circles automatically run. here can start background timer thread randomly call method creating circles.


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