我们正试图使用Xamarin表单构建一个聊天应用程序,但我们一直在Android键盘上收到这个令人讨厌的错误。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,因此我们将以下行添加到TapGestureRecognizer:
messageEntry.Focus();
但由于某些原因,这种情况发生得不够快,经常会出现键盘关闭并立即重新打开的情况。这可防止用户快速连续发布多条消息。有人知道如何修复此问题吗?
感谢post中@AdamKemp的回答,以下是我的解决方案。如果触摸在我的EntryStackLayout
内(不要忘记创建空的自定义呈现器),则我不会取消键盘(这是CurrentFocus
为EditText
时DispatchTouchEvent
将执行的操作)。
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
中:
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;
这篇关于键盘使用Xamarin表单在Android上快速隐藏和重新出现的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持吉威生活!
[英文标题]Keyboard quickly hides and reappears on Android using Xamarin Forms
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