Question

我们正在尝试使用Xamarin Forms构建聊天应用程序，但我们一直在使用Android键盘来解决这个烦人的错误。每当＆＃34;发送＆＃34;按钮被按下，条目（聊天的文本框）上的焦点丢失，键盘消失。这不是我们想要的，所以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，通常键盘会立即关闭并立即再次启动。这可以防止用户按顺序快速发布多条消息。有人知道如何解决这个问题吗？

Answer 1

感谢@ post中@AdamKemp的回答，这是我的解决方案。如果触摸位于我的EntryStackLayout范围内（不要忘记创建空的自定义渲染器），那么我就不会忽略键盘（如果{DispatchTouchEvent CurrentFocus将会执行此操作1}}是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}};
        }
    }

和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;

Answer 2

它有点像黑客攻击，但你可以分离出等待50ms的异步任务，然后在主UI线程上调用messageEntry.Focus（）行...

键盘使用Xamarin Forms快速隐藏并重新出现在Android上

2 个答案: