How do I in Android, If a function is called which is already running, cancel/stop that function and start it from begining

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Java

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Android

How do I within Android, if a function is called which is already running, cancel/stop that function then start it from the beginning?

My code looks like the below, basically throughout my application a given function( Important(); ) is called but rather than have that function run several times. I'd like to Cancel/stop it, then start it from the beginning?

How can I go about doing this?

Code:

public void Important() {
//Do lots of stuff
}

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Important();
    }

    @Override
    protected void onResume() {
        super.onResume();
    Important();
    }

I've already attempted the below making use of booleans. But it just stops a user from running the function again if already running? (which isn't what I'm trying to do)

I want, when it is called again. The running function is stopped. Then freshly run it

Code:

Boolean runningCode = false;
    public void Important() {
if (runningCode== false) {
runningCode = true;
    //Do lots of stuff
runningCode = false;
    }

F.Y.I

Important() is called many times throughout my application, sometimes whilst Important() is still running. Hence the need for a solution to my question :-)


Tasks like resetting variables, formatting the page are carried out within Important();, it is not running on a separate thread. These are tasks that need to be completed on the main UI thread