Currently I have a counter that is subtracted every second, how can I add more time to the freetime variable when I click on the add time button?

if I add the variables before clicking the start button it works, but once the counter is active it does not add more time to the counter

 TextView count_txt;
 Button start_button,moretime_button;
 int freetime = 1800000;
 String time;

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

    CountActivity.this.setTitle("CountDown");

    //find view
    start_button = findViewById(R.id.startcount_button);
    count_txt = findViewById(R.id.textView_count);
    moretime_button = findViewById(R.id.button_moretime);


    moretime_button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //add button


        }
    });


    start_button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            new CountDownTimer(netTime,1000) {
                @Override
                public void onTick(long millisUntilFinished) {

                     time = String.format(Locale.getDefault(),"Time Remaining"   "\n"   "d:d:d",
                            TimeUnit.MILLISECONDS.toHours(millisUntilFinished)`,
                            TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished)% 60,
                            TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished)% 60);

                    count_txt.setText((time));
                    netTime--;

                }

                @Override
                public void onFinish() {

                    count_txt.setText("FINISH!!!");



                }

            }.start();


        }
    });

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