Custom Navigation Drawer

        //Global Declaration
        SNavigationDrawer sNavigationDrawer;
        Class fragmentClass;
        public static Fragment fragment;
        
        //Inside onCreate()
        
        sNavigationDrawer = findViewById(R.id.navigationDrawer);
        
        //Creating a list of menu Items
        
        List<MenuItem> menuItems = new ArrayList<>();
        
        //Use the MenuItem given by this library and not the default one.
        //First parameter is the title of the menu item and then the second parameter is the image which will be the background of the menu item.
        
        menuItems.add(new MenuItem("News",R.drawable.news_bg));
        menuItems.add(new MenuItem("Feed",R.drawable.feed_bg));
        menuItems.add(new MenuItem("Messages",R.drawable.message_bg));
        menuItems.add(new MenuItem("Music",R.drawable.music_bg));
        
        //then add them to navigation drawer
        
        sNavigationDrawer.setMenuItemList(menuItems);
        fragmentClass =  NewsFragment.class;
        try {
            fragment = (Fragment) fragmentClass.newInstance();
        } catch (Exception e) {
            e.printStackTrace();
        }
        if (fragment != null) {
            FragmentManager fragmentManager = getSupportFragmentManager();
            fragmentManager.beginTransaction().setCustomAnimations(android.R.animator.fade_in, android.R.animator.fade_out).replace(R.id.frameLayout, fragment).commit();
        }
        
        

        //Listener to handle the menu item click. It returns the position of the menu item clicked. Based on that you can switch between the fragments.
        
        sNavigationDrawer.setOnMenuItemClickListener(new SNavigationDrawer.OnMenuItemClickListener() {
            @Override
            public void onMenuItemClicked(int position) {
                System.out.println("Position "+position);

                switch (position){
                    case 0:{
                        fragmentClass = NewsFragment.class;
                        break;
                    }
                    case 1:{
                        fragmentClass = FeedFragment.class;
                        break;
                    }
                    case 2:{
                        fragmentClass = MessagesFragment.class;
                        break;
                    }
                    case 3:{
                        fragmentClass = MusicFragment.class;
                        break;
                    }

                }
                
                //Listener for drawer events such as opening and closing.
                sNavigationDrawer.setDrawerListener(new SNavigationDrawer.DrawerListener() {

                    @Override
                    public void onDrawerOpened() {

                    }

                    @Override
                    public void onDrawerOpening(){

                    }

                    @Override
                    public void onDrawerClosing(){
                        System.out.println("Drawer closed");

                        try {
                            fragment = (Fragment) fragmentClass.newInstance();
                        } catch (Exception e) {
                            e.printStackTrace();
                        }

                        if (fragment != null) {
                            FragmentManager fragmentManager = getSupportFragmentManager();
                            fragmentManager.beginTransaction().setCustomAnimations(android.R.animator.fade_in, android.R.animator.fade_out).replace(R.id.frameLayout, fragment).commit();

                        }
                    }

                    @Override
                    public void onDrawerClosed() {

                    }

                    @Override
                    public void onDrawerStateChanged(int newState) {
                        System.out.println("State "+newState);
                    }
                });
            }
        });