android - How to make fragments listen to MainActivity? -


i trying implement callback in button press in layout of mainactivity propagate boolean value 2 fragments visible on screen. 2 fragments change color of background when receive message.

how done?

class demoactivity extends activity{ private boolean someboolean; private fragment frag1,frag2; // init them , begin transaction     btnclick.setonclicklistener{       @override       public void onclick(view v){        frag1.changecolor(somebooean);        frag2.changecolor(someboolean);    } }  class frag1 extends fragment{    public void changecolor(boolean someval){      getrootview().setbackgroundcolor(someval ? r.color.colo_one:r.color.color_two);   } }   class frag2 extends fragment{    public void changecolor(boolean someval){      getrootview().setbackgroundcolor(someval ? r.color.colo_one:r.color.color_two);   } }

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