How to hide a ProgressBar in AsyncTask programmatically in Android?

Issue

I have the following static AsyncTask class:

public static class MyAsyncTask extends AsyncTask<String, Void, String> {
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        progressBar.setVisibility(View.VISIBLE);
    }

    @Override
    protected String doInBackground(String... params) {
        //Do heavy stuff
    }

    @Override
    protected void onPostExecute(String string) {
        super.onPostExecute(string);
        progressBar.setVisibility(View.GONE);
    }
}

I want to show/hide the progressBar as you see in those two methods. The problem is that I have to make the progressBar static. Doing this, I get:

Do not place Android context classes in static fields; this is a memory leak (and also breaks Instant Run)

If I remove the static that stays in front of my MyAsyncTask class I get:

This AsyncTask class should be static or leaks might occur (MainActivity.MyAsyncTask)

How to solve this?

Edit:

private void checkUser() {
    uidRef.get().addOnCompleteListener(task -> {
        if (task.isSuccessful()) {
            DocumentSnapshot document = task.getResult();
            User user = document.toObject(User.class);
            if (user == null) {
                MyAsyncTask myAsyncTask = new MyAsyncTask();
                myAsyncTask.execute(url);
            }
        }
    });
}

Solution

I faced this "static" problem in async task earlier and there is a really nice way to get the output of async task back to activity . Simply put

String output = myAsyncTask.execute(url).get();

You will get the output, The final code is.

progressBar.setVisibility(View.VISIBLE);                                  
String output = myAsyncTask.execute(url).get();
progressBar.setVisibility(View.GONE);

Until you get the output the next line will not be executed. I am adding an example code for further demo.

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Button exe = findViewById(R.id.async);
    exe.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            try {
                updateAsyncTask up = new updateAsyncTask();

                long l = up.execute().get();
                System.out.println("inside main "+l);                    
            } catch (ExecutionException e) {
                e.printStackTrace();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    });


}

 private static class updateAsyncTask extends AsyncTask<Void, Void, Long> {

    @Override
    protected Long doInBackground(Void... voids) {

        long l = 0;
        for(int i=0;i<2000;i++)
        {
            l = l+i;
            System.out.println(l);              

        }
        return l;
    }

    }

Answered By - amitava