/**
     * Timer using Recursive
     *
     * @param view
     */
    private void startCountUsingRecursive(final View view) {
        this.keepCount = true;
        this.recursive(view);
    }

    /**
     * recursive funtion for Recursive's timer,
     * stop once the keepCount == false,
     * otherwise, keep recursive
     *
     * @param view
     */
    private void recursive(final View view) {
        view.postDelayed(new Runnable() {
            @Override
            public void run() {
                if (keepCount) {
                    second++;
                    update();
                    recursive(view);
                }
            }
        }, 1000L);
    }

    /**
     * refresh timer's textfield
     */
    private void update() {
        final TextView textView = (TextView) this.findViewById(R.id.textView_counter);
        textView.setText(this.reformat(this.second));
    }