PowerMenu powerMenu = new PowerMenu.Builder(context)
          .addItemList(list) // list has "Novel", "Poerty", "Art"
          .addItem(new PowerMenuItem("Journals", false)) // add an item.
          .addItem(new PowerMenuItem("Travel", false)) // aad an item list.
          .setAnimation(MenuAnimation.SHOWUP_TOP_LEFT) // Animation start point (TOP | LEFT).
          .setMenuRadius(10f) // sets the corner radius.
          .setMenuShadow(10f) // sets the shadow.
          .setTextColor(ContextCompat.getColor(context, R.color.md_grey_800))
          .setTextGravity(Gravity.CENTER)
          .setTextTypeface(Typeface.create("sans-serif-medium", Typeface.BOLD))
          .setSelectedTextColor(Color.WHITE)
          .setMenuColor(Color.WHITE)
          .setSelectedMenuColor(ContextCompat.getColor(context, R.color.colorPrimary))
          .setOnMenuItemClickListener(onMenuItemClickListener)
          .build();

new PowerMenuItem("Travel");
new PowerMenuItem("Poetery", false); // item name, isSelected (default is false).
new PowerMenuItem("Art", R.drawable.icon_art) // item name, item menu icon.
new PowerMenuItem("Travel", R.drawable.icon_travel, true) // item name, item menu icon, isSelected .

.setSelectedTextColor(Color.WHITE) // sets the color of the selected item text. 
.setSelectedMenuColor(ContextCompat.getColor(context, R.color.colorPrimary)) // sets the color of the selected menu item color.

private OnMenuItemClickListener<PowerMenuItem> onMenuItemClickListener = new OnMenuItemClickListener<PowerMenuItem>() {
    @Override
    public void onItemClick(int position, PowerMenuItem item) {
        Toast.makeText(getBaseContext(), item.getTitle(), Toast.LENGTH_SHORT).show();
        powerMenu.setSelectedPosition(position); // change selected item
        powerMenu.dismiss();
    }
};

.setOnMenuItemClickListener(onMenuItemClickListener)

powerMenu.showAsDropDown(view); // view is an anchor

public class IconPowerMenuItem {
    private Drawable icon;
    private String title;

    public IconPowerMenuItem(Drawable icon, String title) {
        this.icon = icon;
        this.title = title;
    }
 // --- skipped setter and getter methods
}

public class IconMenuAdapter extends MenuBaseAdapter<IconPowerMenuItem> {

    @Override
    public View getView(int index, View view, ViewGroup viewGroup) {
        final Context context = viewGroup.getContext();

        if(view == null) {
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = inflater.inflate(R.layout.item_icon_menu, viewGroup, false);
        }

        IconPowerMenuItem item = (IconPowerMenuItem) getItem(index);
        final ImageView icon = view.findViewById(R.id.item_icon);
        icon.setImageDrawable(item.getIcon());
        final TextView title = view.findViewById(R.id.item_title);
        title.setText(item.getTitle());
        return super.getView(index, view, viewGroup);
    }
}

CustomPowerMenu customPowerMenu = new CustomPowerMenu.Builder<>(context, new IconMenuAdapter())
       .addItem(new IconPowerMenuItem(ContextCompat.getDrawable(context, R.drawable.ic_wechat), "WeChat"))
       .addItem(new IconPowerMenuItem(ContextCompat.getDrawable(context, R.drawable.ic_facebook), "Facebook"))
       .addItem(new IconPowerMenuItem(ContextCompat.getDrawable(context, R.drawable.ic_twitter), "Twitter"))
       .addItem(new IconPowerMenuItem(ContextCompat.getDrawable(context, R.drawable.ic_line), "Line"))
       .setOnMenuItemClickListener(onIconMenuItemClickListener)
       .setAnimation(MenuAnimation.SHOWUP_TOP_RIGHT)
       .setMenuRadius(10f)
       .setMenuShadow(10f)
       .build();

private OnMenuItemClickListener<IconPowerMenuItem> onIconMenuItemClickListener = new OnMenuItemClickListener<IconPowerMenuItem>() {
    @Override
    public void onItemClick(int position, IconPowerMenuItem item) {
        Toast.makeText(getBaseContext(), item.getTitle(), Toast.LENGTH_SHORT).show();
        iconMenu.dismiss();
    }
};

return new PowerMenu.Builder(context)
    // saves the position automatically when the menu is selected.
    // If we set the same preference name on the other PowerMenus, they will share the saving position.
   .setPreferenceName("HamburgerPowerMenu")

    // invokes the listener automatically that has the saved position arguments along the lifecycle rule.
    // lifecycle rules should be ON_CREATE, ON_START or ON_RESUME.
    // in the below codes, the onMenuClickListener will be invoked when onCreate lifecycle.
   .setLifecycleOwner(lifecycleOwner)
   .setInitializeRule(Lifecycle.Event.ON_CREATE, 0) // Lifecycle.Event and default position.
   --- skips ---

.getPreferenceName() // gets the preference name of PowerMenu.
.getPreferencePosition(int defaultPosition) // gets the saved preference position from the SharedPreferences.
.setPreferencePosition(int defaultPosition) // sets the preference position name for persistence manually.
.clearPreference() // clears the preference name of PowerMenu.

.setCircularEffect(CircularEffect.BODY) // shows circular revealed effects for all body of the popup menu.
.setCircularEffect(CircularEffect.INNER) // Shows circular revealed effects for the content view of the popup menu.

PowerMenu powerMenu = new PowerMenu.Builder(context)
           .setHeaderView(R.layout.layout_dialog_header) // header used for title
           .setFooterView(R.layout.layout_dialog_footer) // footer used for yes and no buttons
           .addItem(new PowerMenuItem("This is DialogPowerMenu", false)) // this is body
           .setLifecycleOwner(lifecycleOwner)
           .setAnimation(MenuAnimation.SHOW_UP_CENTER)
           .setMenuRadius(10f)
           .setMenuShadow(10f)
           .setWith(600)
           .setSelectedEffect(false)
           .build();

CustomPowerMenu customPowerMenu = new CustomPowerMenu.Builder<>(context, new CustomDialogMenuAdapter())
         setHeaderView(R.layout.layout_custom_dialog_header) // header used for title
        .setFooterView(R.layout.layout_custom_dialog_footer) // footer used for Read More and Close buttons
         // this is body
        .addItem(new NameCardMenuItem(ContextCompat.getDrawable(context, R.drawable.face3), "Sophie", context.getString(R.string.board3)))
        .setLifecycleOwner(lifecycleOwner)
        .setAnimation(MenuAnimation.SHOW_UP_CENTER)
        .setWith(800)
        .setMenuRadius(10f)
        .setMenuShadow(10f)
        .build();

.showAsAnchorLeftTop(view) // showing the popup menu as left-top aligns to the anchor.
.showAsAnchorLeftBottom(view) // showing the popup menu as left-bottom aligns to the anchor.
.showAsAnchorRightTop(view) // using with .setAnimation(MenuAnimation.SHOWUP_TOP_RIGHT) looks better
.showAsAnchorRightBottom(view) // using with .setAnimation(MenuAnimation.SHOWUP_TOP_RIGHT) looks better
.showAsAnchorCenter(view) // using with .setAnimation(MenuAnimation.SHOW_UP_CENTER) looks better

.getContentViewWidth() // return popup's measured width
.getContentViewHeight() // return popup's measured height

// showing the popup menu at the center of an anchor. This is the same using .showAsAnchorCenter.
hamburgerMenu.showAsDropDown(view, 
        view.getMeasuredWidth()/2 - hamburgerMenu.getContentViewWidth(), 
       -view.getMeasuredHeight()/2 - hamburgerMenu.getContentViewHeight());

.setShowBackground(false) // do not showing background.
.setTouchInterceptor(onTouchListener) // sets the touch listener for the outside of popup.
.setFocusable(true) // makes focusing only on the menu popup.

.setLifecycleOwner(lifecycleOwner)

.addItemList(list) // add a PowerMenuItem list.
.addItem(new PowerMenuItem("Journals", false)) // add a PowerMenuItem.
.addItem(3, new PowerMenuItem("Travel", false)) // add a PowerMenuItem at position 3.
.setLifecycleOwner(lifecycleOwner) // set LifecycleOwner for preventing memory leak.
.setWith(300) // sets the popup width size.
.setHeight(400) // sets the popup height size.
.setMenuRadius(10f) // sets the popup corner radius.
.setMenuShadow(10f) // sets the popup shadow.
.setDivider(new ColorDrawable(ContextCompat.getColor(context, R.color.md_blue_grey_300))) // sets a divider.
.setDividerHeight(1) // sets the divider height.
.setAnimation(MenuAnimation.FADE) // sets animations of the popup. It will start up when the popup is showing.
.setTextColor(ContextCompat.getColor(context, R.color.md_grey_800)) // sets the color of the default item text.
.setTextSize(12) // sets a text size of the item text
.setTextGravity(Gravity.CENTER) // sets a gravity of the item text.
.setTextTypeface(Typeface.create("sans-serif-medium", Typeface.BOLD)) // sets a typeface of the item text
.setSelectedTextColor(Color.WHITE) // sets the color of the selected item text.
.setMenuColor(Color.WHITE) // sets the color of the menu item color.
.setSelectedMenuColor(ContextCompat.getColor(context, R.color.colorPrimary)) // sets the color of the selected menu item color.
.setSelectedEffect(false) // sets the selected effects what changing colors of the selected menu item.
.setOnMenuItemClickListener(onMenuItemClickListener) // sets an item click listener.
.setOnDismissListener(OnDismissedListener onDismissListener) // sets a menu dismiss listener.
.setHeaderView(View view) //  sets the header view of the popup menu list.
.setHeaderView(int layout) // sets the header view of the popup menu using layout.
.setFooterView(View view) // sets the footer view of the popup menu list.
.setFooterView(int layout) // sets the footer view of the popup menu using layout.
.setSelection(int position) // sets the selected position of the popup menu. It can be used for scrolling as the position.
.getSelectedPosition() // gets the selected item position. if not selected before, returns -1 .
.getHeaderView() // gets the header view of the popup menu list.
.getFooterView() // gets the footer view of the popup menu list.
.getMenuListView() // gets the ListView of the popup menu.

.setBackgroundAlpha(0.7f) // sets the alpha of the background.
.setBackgroundColor(Color.GRAY) // sets the color of the background.
.setShowBackground(false) // sets the background is showing or not.
.setOnBackgroundClickListener(onClickListener) // sets the background click listener of the background.

.showAsDropDown(View anchor); // showing the popup menu as drop down to the anchor.
.showAsDropDown(View anchor, -370, 0); // showing the popup menu as drop down to the anchor with x-off and y-off.
.showAtCenter(View layout); // showing the popup menu as center aligns to the anchor.
.showAtCenter(View layout, 0, 0); // showing the popup menu as center aligns to the anchor with x-off and y-off.
.showAtLocation(View anchor, int xOff, int yOff) // showing the popup menu as center aligns to the anchor with x-off and y-off.
.showAtLocation(View anchor, int gravity, int xOff, int yOff) // showing the popup menu to the specific location to the anchor with Gravity.
.isShowing(); // gets the popup is showing or not.
.dismiss(); // dismiss the popup.