final AppBarLayout mAppBarLayout = (AppBarLayout) findViewById(R.id.appBar);
        mAppBarLayout.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
            boolean isShow = false;
            int scrollRange = -1;

            @Override
            public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
                if (scrollRange == -1) {
                    scrollRange = appBarLayout.getTotalScrollRange();
                }
                if (scrollRange + verticalOffset == 0) {
                    isShow = true;
                    //showOption(R.id.action_info);
                    mTitle.setVisibility(View.VISIBLE);
                    if (fontpackfeature.equals("2")) {
                        Objects.requireNonNull(getSupportActionBar()).setIcon(R.mipmap.wingsgold);
                    } else if (fontpackfeature.equals("3")) {
                        Objects.requireNonNull(getSupportActionBar()).setIcon(R.mipmap.wingswine);
                    } else if (fontpackfeature.equals("4")) {
                        Objects.requireNonNull(getSupportActionBar()).setIcon(R.mipmap.wingsonline);
                    } else {
                        Objects.requireNonNull(getSupportActionBar()).setIcon(R.mipmap.wingsicon);
                    }
                } else if (isShow) {
                    isShow = false;
                    //hideOption(R.id.action_info);
                    mTitle.setVisibility(View.GONE);
                    Objects.requireNonNull(getSupportActionBar()).setIcon(R.drawable.transparentpng);
                    mAppBarLayout.setExpanded(true, true);
                }
            }
        });