"Floating Action Button" menu

FabMenu.java

/**
 * Created by Andrey Kolpakov on 19.01.2018
 */
public class FabMenu {
    private final ViewGroup parent;
    private final Context context;
    private final FloatingActionButton fab;
    private boolean isFabMenuOpened;
    private View maskedView;

    private ArrayList<FabMenuItem> menuItems = new ArrayList<>();
    private ArrayList<FabMenuView> menuItemViews = new ArrayList<>();

    public FabMenu(ViewGroup parent, FloatingActionButton mainFab) {
        this.parent = parent;
        this.context = parent.getContext();
        this.fab = mainFab;
    }

    private View createMaskedView() {
        View view = new View(context);
        view.setBackgroundColor(ContextCompat.getColor(context, R.color.fab_menu_background));
        view.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                closeFabMenu();
            }
        });
        view.setScaleX(0f);
        view.setScaleY(0f);
        view.setAlpha(0f);
        return view;
    }

    public void addMenuItem(int imageResId, int label, View.OnClickListener action) {
        menuItems.add(new FabMenuItem(imageResId, label, action));
    }

    public void create() {
        if (menuItems.isEmpty()) {
            fab.setVisibility(View.GONE);
            return;
        }

        maskedView = createMaskedView();
        if (menuItems.size() == 1) {
            fab.setImageResource(menuItems.get(0).imageResId);
            fab.setOnClickListener(menuItems.get(0).action);
        } else {
            createFabMenu();
        }
        fab.show();
    }

    public boolean hasItems() {
        return menuItems.size() > 0;
    }

    private void createFabMenu() {
        fab.setImageResource(R.drawable.ic_menu_hamburger);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (!isFabMenuOpened) {
                    showFabMenu();
                } else {
                    closeFabMenu();
                }
            }
        });

        int firstDy = (int) context.getResources().getDimension(R.dimen.fab_menu_firt_dy);
        int dy = (int) context.getResources().getDimension(R.dimen.fab_menu_dy);
        for (int i = 0; i < menuItems.size(); i++) {
            FabMenuItem menuItem = menuItems.get(i);
            View menuView = View.inflate(context, R.layout.layout_fab_menu_item, null);
            FloatingActionButton menuFab = menuView.findViewById(R.id.fab);
            menuFab.setImageResource(menuItem.imageResId);
            TextView menuFabLabel = menuView.findViewById(R.id.label);
            menuFabLabel.setText(menuItem.labelResId);
            menuFabLabel.setAlpha(0f);
            menuFab.setOnClickListener(new OnClickListenerDelegate(menuItem.action));
            int offset = (i + 1) * dy + firstDy;
            menuItemViews.add(new FabMenuView(offset, menuView, menuFabLabel));
        }
    }

    private void showFabMenu() {
        isFabMenuOpened = true;
        fab.setImageResource(R.drawable.ic_close_primary_vector);

        maskedView.setPivotX(fab.getX() + fab.getWidth() / 2);
        maskedView.setPivotY(fab.getY() - fab.getHeight() / 2);
        parent.addView(maskedView, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));

        CoordinatorLayout.LayoutParams layoutParams = new CoordinatorLayout.LayoutParams(CoordinatorLayout.LayoutParams.MATCH_PARENT, CoordinatorLayout.LayoutParams.WRAP_CONTENT);
        for (FabMenuView menuItemView : menuItemViews) {
            parent.addView(menuItemView.menuView, layoutParams);
            menuItemView.menuView.setTranslationY(fab.getY() - fab.getHeight() / 2);
            menuItemView.menuView.animate().translationY(menuItemView.menuView.getTranslationY() - menuItemView.offsetPx);
            menuItemView.labelView.animate().setStartDelay(200).setDuration(150).alpha(1f);
        }

        maskedView.animate().scaleX(1f).scaleY(1f).alpha(0.85f).setDuration(200);
    }

    public void closeFabMenu() {
        isFabMenuOpened = false;
        fab.setImageResource(R.drawable.ic_menu_hamburger);

        for (FabMenuView menuItemView : menuItemViews) {
            menuItemView.menuView.animate().translationY(fab.getY());
            menuItemView.labelView.setAlpha(0f);
        }

        maskedView.animate().scaleX(0f).scaleY(0f).setDuration(200).alpha(0f).setListener(animatorListener);
    }

    public boolean isOpened() {
        return isFabMenuOpened;
    }

    public void clear() {
        removeViews();
        menuItemViews.clear();
        menuItems.clear();
        maskedView = null;
    }

    private void removeViews() {
        if (maskedView != null) {
            parent.removeViewInLayout(maskedView);
        }

        for (FabMenuView menuItemView : menuItemViews) {
            parent.removeViewInLayout(menuItemView.menuView);
        }
    }

    private Animator.AnimatorListener animatorListener = new Animator.AnimatorListener() {
        @Override
        public void onAnimationStart(Animator animation) {

        }

        @Override
        public void onAnimationEnd(Animator animation) {
            if (!isFabMenuOpened) {
                removeViews();
            }
        }

        @Override
        public void onAnimationCancel(Animator animation) {

        }

        @Override
        public void onAnimationRepeat(Animator animation) {

        }
    };

    class OnClickListenerDelegate implements View.OnClickListener {
        private final View.OnClickListener clickListener;

        OnClickListenerDelegate(View.OnClickListener clickListener) {
            this.clickListener = clickListener;
        }

        @Override
        public void onClick(final View v) {
            closeFabMenu();
            if (clickListener != null) {
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        clickListener.onClick(v);
                    }
                }, 400);
            }
        }
    }

    public static class FabMenuItem {
        int imageResId;
        int labelResId;
        View.OnClickListener action;

        FabMenuItem(int imageResId, int labelResId, View.OnClickListener action) {
            this.imageResId = imageResId;
            this.labelResId = labelResId;
            this.action = action;
        }
    }

    public static class FabMenuView {
        int offsetPx;
        View menuView;
        TextView labelView;

        FabMenuView(int offsetPx, View menuView, TextView labelView) {
            this.offsetPx = offsetPx;
            this.menuView = menuView;
            this.labelView = labelView;
        }
    }
}