I want to go from Activity A to Activity B onClick and back to Activity  A if a condition have not been on Activity B.
Activity A:
    onClick() {
       Intent intent = new Intent(this, Activity_B.class);
       intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
       startActivity(intent);
    }
Activity B:
if (condition) {
   //code for return back to Activity A
}
 
    