android - better way for activity navigation

android - better way for activity navigation

My app having the 3 activities(A1,A2 and A3). The activities to be stay in
the background when it goes another activity. For some instance I should
redirect to A1 from A3. For this, I used the one Boolean counter. I set to
true in A3 for that instance. In A2 onresume i checked the boolean value
if it is true then i finished that activity(A2). finally A1 is onResume.
But i think this is one solution but it's not better solution. can anyone
suggest the better solution?
A3 Activity
status = true;// for some instance
A2 Activity
onResume() { if(status){finish();} }
//A1 is onResumed
thanks