在Xamarin中隐藏软键盘

问题描述

在Xamarin.forms便携式表单项目中聚焦Entry时，如何隐藏软键盘以显示?我认为我们必须为此编写平台特定的渲染器，但是以下方法不起作用:

How do I hide the softkeyboard for showing up when focusing an Entry in Xamarin.forms portable forms project? I assume we have to write platform specific renderers for that, but the following does not work:

我创建自己的条目子类:

I create my own entry subclass:

public class MyExtendedEntry : Entry
{
}

，然后在xamarin.android项目中渲染我的渲染器:

and then in the xamarin.android project my renderer:

public class MyExtendedEntryRenderer : EntryRenderer
{
    protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
    {
        base.OnElementChanged(e);
        if (Control != null)
        {
            new Handler().Post(delegate
            {
                var imm = (InputMethodManager)Control.Context.GetSystemService(Context.InputMethodService);
                var result = imm.HideSoftInputFromWindow(Control.WindowToken, 0);
            });
        }
    }
}

OnElementChanged被按预期方式调用，当使用Handler.Post()时，我也获得了WindowToken而不是null.遗憾的是，HideSoftInputFromWindow的返回值始终为false，并且在单击Entry时，软键盘仍会打开.

The OnElementChanged is called as expected and when using Handler.Post() I also get a WindowToken instead of null. Sadly the return value from HideSoftInputFromWindow is always false and the softkeyboard still turns up when clicking on the Entry.

推荐答案

OnElementChanged.您要做的是单击该条目时隐藏键盘，因此您应该将FocusChange的事件处理程序添加到Control.

OnElementChanged is called whenever the view is initialized and attached to the view. What you want to do is to hide the keyboard when the entry is clicked, so you should add an event handler to FocusChange to the Control.

示例:

    protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
    {
        base.OnElementChanged(e);
        if (Control != null)
        {
            Control.Click += (sender, evt) => {
                new Handler().Post(delegate
                    {
                        var imm = (InputMethodManager)Control.Context.GetSystemService(Android.Content.Context.InputMethodService);
                        var result = imm.HideSoftInputFromWindow(Control.WindowToken, 0);

                        Console.WriteLine(result);
                    });
            };

            Control.FocusChange += (sender, evt) => {
                new Handler().Post(delegate
                    {
                        var imm = (InputMethodManager)Control.Context.GetSystemService(Android.Content.Context.InputMethodService);
                        var result = imm.HideSoftInputFromWindow(Control.WindowToken, 0);

                        Console.WriteLine(result);
                    });
            };
        }
    }

更新:@Vikram的组合答案

Update: Combined answer from @Vikram

更新:添加了Click事件处理程序

Update: Added Click event handler

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