Suppose I have an Activity named ActivityA and another Activity named ActivityB. In each one I have a button that opens another Activity when it is clicked. I want to do following work when button is clicked:
check if there is an existing type of the target Activity in the activity back-stack or not, if there is, bring that Activity to the top and if not create new Intent and then go to that Activity.
How can I implement this?
Thanks.
Simple.
Intent intent = new Intent(this, TargetActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
startActivity(intent);
This does exactly what you want. If there is already an instance of TargetActivity in the task stack, that instance will be rearranged and brought to the top (front) of the stack. If there is no existing instance of TargetActivity, Android will create a new instance and put that on the top of the stack.
