public SystemBarTintManager(Activity activity)
        {

            Window win = activity.Window;
            ViewGroup decorViewGroup = (ViewGroup)win.DecorView;

            if (Build.VERSION.SdkInt >= BuildVersionCodes.Kitkat)
            {
                // check theme attrs
                int[] attrs = {Android.Resource.Attribute.WindowTranslucentStatus,
                    Android.Resource.Attribute.WindowTranslucentNavigation};
                TypedArray a = activity.ObtainStyledAttributes(attrs);
                try
                {
                    mStatusBarAvailable = a.GetBoolean(0, false);
                    mNavBarAvailable = a.GetBoolean(1, false);
                }
                finally
                {
                    a.Recycle();
                }


                // check window flags
                //IWindowManager.LayoutParams 
                WindowManagerLayoutParams winParams = win.Attributes;
                WindowManagerFlags bits = WindowManagerFlags.TranslucentStatus;
                if ((winParams.Flags & bits) != 0)
                {
                    mStatusBarAvailable = true;
                }
                bits = WindowManagerFlags.TranslucentNavigation;
                if ((winParams.Flags & bits) != 0)
                {
                    mNavBarAvailable = true;
                }
            }

            mConfig = new SystemBarConfig(activity, mStatusBarAvailable, mNavBarAvailable);
            // device might not have virtual navigation keys
            if (!mConfig.hasNavigtionBar())
            {
                mNavBarAvailable = false;
            }

            if (mStatusBarAvailable)
            {
                setupStatusBarView(activity, decorViewGroup);
            }
            if (mNavBarAvailable)
            {
                setupNavBarView(activity, decorViewGroup);
            }

        }
            /**
             * Parse attributes during inflation from a view hierarchy into the
             * arguments we handle.
             */
            public override void OnInflate(Activity activity, Android.Util.IAttributeSet attrs, Bundle savedInstanceState)
            {
                base.OnInflate (activity, attrs, savedInstanceState);

                var a = activity.ObtainStyledAttributes(attrs,Resource.Styleable.FragmentArguments);
                mLabel = a.GetText(Resource.Styleable.FragmentArguments_android_label);
                a.Recycle();
            }