使用 Xamarin Forms 在 Android 上快速隐藏和重新显示键盘

我们正在尝试使用 Xamarin Forms 构建一个聊天应用程序，但我们在使用 Android 键盘时不断遇到这个恼人的错误。每当点击“发送”按钮时，条目（用于聊天的文本框）上的焦点就会消失，键盘也会消失。这不是我们想要的，因此我们将这一行添加到 TapGestureRecognizer 中：

messageEntry.Focus();

但由于某种原因，这种情况发生得不够快，键盘经常会下降并立即再次上升。这可以防止用户快速连续发布多条消息。有谁知道如何解决这个问题？

感谢 @AdamKemp 的回答post https://forums.xamarin.com/discussion/56523/entry-cell-loses-focus-on-button-press-in-android-but-not-ios-work-around，这是我的解决方案。如果触摸在我之内EntryStackLayout（不要忘记创建空的自定义渲染器），然后我不会关闭键盘（这就是DispatchTouchEvent会做如果CurrentFocus is EditText).

public class EditorAndButtonReproPage : ContentPage
    {
        public EditorAndButtonReproPage()
        {
            BackgroundColor = Color.Gray;
            Padding = 50;
            var editor = new Editor {HorizontalOptions = LayoutOptions.FillAndExpand};
            var editorButton = new Button {Text = "OK", HorizontalOptions = LayoutOptions.End};
            var editorLayout = new EntryStackLayout { Orientation = StackOrientation.Horizontal, Children = { editor, editorButton}, VerticalOptions = LayoutOptions.Start};
            var entry = new ExtendedEntry { Placeholder = "Entry", HorizontalOptions = LayoutOptions.FillAndExpand };
            var entryButton = new Button { Text = "OK", HorizontalOptions = LayoutOptions.End };
            var entryLayout = new EntryStackLayout { Orientation = StackOrientation.Horizontal, Children = { entry, entryButton }, VerticalOptions = LayoutOptions.Start };
            Content = new StackLayout {Children = {editorLayout, entryLayout}};
        }
    }

并在MainActivity:

private bool _ignoreNewFocus;
        public override bool DispatchTouchEvent(MotionEvent e)
        {
            var currentView = CurrentFocus;
            var parent = currentView?.Parent?.Parent;
            var entryStackLayout = parent as EntryStackLayout;
            if (entryStackLayout != null)
            {
                var entryLayoutLocation = new int[2];
                entryStackLayout.GetLocationOnScreen(entryLayoutLocation);
                var x = e.RawX + entryStackLayout.Left - entryLayoutLocation[0];
                var y = e.RawY + entryStackLayout.Top - entryLayoutLocation[1];
                var entryStackLayoutRect = new Rectangle(entryStackLayout.Left, entryStackLayout.Top, entryStackLayout.Width, entryStackLayout.Height);
                _ignoreNewFocus = entryStackLayoutRect.Contains(x, y);
            }
            var result = base.DispatchTouchEvent(e);
            _ignoreNewFocus = false;
            return result;
        }

        public override Android.Views.View CurrentFocus => _ignoreNewFocus ? null : base.CurrentFocus;