在webview xamarin窗体中单击输入和显示键盘时页面不滚动

var inputField = FindViewById<EditText>(Resource.Id.inputField);
inputField.RequestFocus();

var rootView = FindViewById<ViewGroup>(Resource.Id.rootLayout);
rootView.ViewTreeObserver.AddOnGlobalLayoutListener(new ViewTreeObserver.IOnGlobalLayoutListener()
{
    public void OnGlobalLayout()
    {
        Rect r = new Rect();
        rootView.getWindowVisibleDisplayFrame(r);
        int screenHeight = rootView.RootView.Height;
        int keypadHeight = screenHeight - r.Bottom;

        if (keypadHeight > screenHeight * 0.15)
        { // 0.15 ratio is perhaps enough to determine keypad height.
            // Keyboard is shown
            // Handle scroll up
        }
        else
        {
            // Keyboard is hidden
            // Handle scroll down
        }
    }
});

<ScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">
        <!-- Your content here -->
    </LinearLayout>
</ScrollView>