Android using static boolean as flag to determine if activity is visible -

i wanted hear other opinions using following method determine other activities or services if activity visible: method using static booleans flags, values depends of activity life-cycle. implemented solution , seems work alright. have doubts whether reliable solution, because, understand, activity life-cycle contained inside of instance of activity class, static methods or fields applies instances. activity, visibility status needs determined, i've used singletask launch mode, there shouldn't more 1 instance. in mind, safe assume static boolean 100% represent actual status of activity?

well, sure can use static boolean flags. however, if have more options true/false, recommend use enum instead.

if application has more 2 activities, using booleans leads hard maintenance.

so clear code use enum flags like:

public enum eactivitystate{   unknown,   visible,   not_visible,   launched,   // .... } 

after can use:

private eactivitystate mactivitystate = eactivitystate.unknown;  ....  if(eactivitystate.launched == mactivitystate ){   // }