Android - How to finish a child activity from a parent activity -

Android - How to finish a child activity from a parent activity -

i have first activity start new activity b with:

intent.setclass(a.this, b.class);

now, after event, finish b (a contains running thread).

how reach this?

thanks in advance.

you can send broadcast message b do need utilize b activity instance in these terms? may improve selection create b dialog?

android android-intent android-activity