Changing background color of the layout on a button click in Android -

i newbie in android. please spare me if asking stupid question.

my application contains 1 button in linear layout. requirement is, have change background color of linear layout of app on button click. default white, when press on button should change random color , when press button again, should change default color (white) again.

button.setbackgroundcolor(color.blue) (on onclick() method), changes background color blue, how default color?

i hope code you! take boolean variable when button clicked.

public class mainactivity extends activity {   boolean iscolor = true; @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      button btn = (button) findviewbyid(r.id.btn);     final linearlayout layout = (linearlayout) findviewbyid(r.id.linearlayout1);      btn.setonclicklistener(new onclicklistener() {       @override         public void onclick(view view) {           if(iscolor)          {              layout.setbackgroundcolor(color.blue);              iscolor = false;          }          else          {              layout.setbackgroundcolor(color.white);              iscolor = true;          }          }     }); }