BottomNavigationView图标大小和颜色设置

取消导航栏图标着色

navigation.setItemIconTintList(null);

设置导航栏图标

调整底部导航栏图标大小

    private void adjustNavigationIcoSize(BottomNavigationView navigation){
        BottomNavigationMenuView menuView = (BottomNavigationMenuView) navigation.getChildAt(0);
        for (int i = 0; i < menuView.getChildCount(); i++) {
            final View iconView = menuView.getChildAt(i).findViewById(android.support.design.R.id.icon);
            final ViewGroup.LayoutParams layoutParams = iconView.getLayoutParams();
            final DisplayMetrics displayMetrics = getResources().getDisplayMetrics();
            layoutParams.height = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 20, displayMetrics);
            layoutParams.width = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 20, displayMetrics);
            iconView.setLayoutParams(layoutParams);
        } 
    }