com.ashokvarma.android:bottom-navigation-bar

实现底部导航栏只有图标和图标加文字混合情况下，图标能居中显示的功能BottomNavigationTab类中修改

  if (isNoTitleMode || (!isNoTitleMode)) {
            labelView.setVisibility(GONE);
            LayoutParams layoutParams = (LayoutParams) iconContainerView.getLayoutParams();
            layoutParams.gravity = Gravity.CENTER;
            setNoTitleIconContainerParams(layoutParams);
            iconContainerView.setLayoutParams(layoutParams);

            LayoutParams iconLayoutParams = (LayoutParams) iconView.getLayoutParams();
            setNoTitleIconParams(iconLayoutParams);
            iconView.setLayoutParams(iconLayoutParams);
        }

改为 if (isNoTitleMode || (!isNoTitleMode && labelView.getText().equals("")))

定义的时候此时导航栏文字传""就行