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C# 浮动操作按钮：膨胀类浮动操作按钮时出错

c# xamarin.forms

C# 浮动操作按钮：膨胀类浮动操作按钮时出错,c#,xamarin.forms,floating-action-button,C#,Xamarin.forms,Floating Action Button,我正在尝试使用NuGetFAB.formspackage（）中xamarin.forms中的浮动操作按钮。我试图使我的代码与Sample文件夹中提供的示例相似 Xamarin.DroidMainActivity.csfile protected override void OnCreate(Bundle bundle) { base.OnCreate(bundle); global::Xamarin.Forms.Forms.Init(this, bundle); FA

我正在尝试使用NuGet
FAB.forms
package（）中xamarin.forms中的浮动操作按钮。我试图使我的代码与
Sample
文件夹中提供的示例相似

Xamarin.Droid
MainActivity.cs
file

protected override void OnCreate(Bundle bundle)
{
    base.OnCreate(bundle);

    global::Xamarin.Forms.Forms.Init(this, bundle);

    FAB.Droid.FloatingActionButtonRenderer.InitControl();

    LoadApplication(new App());
}

public override bool FinishedLaunching(UIApplication app, NSDictionary options)
{
    global::Xamarin.Forms.Forms.Init();

    FAB.iOS.FloatingActionButtonRenderer.InitControl();

    LoadApplication(new App());

    return base.FinishedLaunching(app, options);
}

public App(){MainPage = new LatestNews();}
Xamarin.ios
AppDelegate.cs
文件

protected override void OnCreate(Bundle bundle)
{
    base.OnCreate(bundle);

    global::Xamarin.Forms.Forms.Init(this, bundle);

    FAB.Droid.FloatingActionButtonRenderer.InitControl();

    LoadApplication(new App());
}

public override bool FinishedLaunching(UIApplication app, NSDictionary options)
{
    global::Xamarin.Forms.Forms.Init();

    FAB.iOS.FloatingActionButtonRenderer.InitControl();

    LoadApplication(new App());

    return base.FinishedLaunching(app, options);
}

public App(){MainPage = new LatestNews();}
Xamarin.portable
App.cs
文件

protected override void OnCreate(Bundle bundle)
{
    base.OnCreate(bundle);

    global::Xamarin.Forms.Forms.Init(this, bundle);

    FAB.Droid.FloatingActionButtonRenderer.InitControl();

    LoadApplication(new App());
}

public override bool FinishedLaunching(UIApplication app, NSDictionary options)
{
    global::Xamarin.Forms.Forms.Init();

    FAB.iOS.FloatingActionButtonRenderer.InitControl();

    LoadApplication(new App());

    return base.FinishedLaunching(app, options);
}

public App(){MainPage = new LatestNews();}
LatestNews.xaml文件

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:fab="clr-namespace:FAB.Forms;assembly=FAB.Forms"
             x:Class="HuraApp.Pages.LatestNews">
    ...
    <fab:FloatingActionButton
              x:Name="fabBtn"
              Source="plus.png"
              Size="Normal"
              Clicked="Handle_FabClicked"
              NormalColor="Green"
              RippleColor="Red" />
    ...
</ContentPage>
portable packages.config文件

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="FAB.Forms" version="2.1.1" targetFramework="portable45-net45+win8+wpa81" />
  <package id="Microsoft.Bcl" version="1.1.10" targetFramework="portable45-net45+win8+wpa81" />
  <package id="Microsoft.Bcl.Build" version="1.0.21" targetFramework="portable45-net45+win8+wpa81" />
  <package id="Microsoft.Net.Http" version="2.2.29" targetFramework="portable45-net45+win8+wpa81" />
  <package id="Newtonsoft.Json" version="9.0.1" targetFramework="portable45-net45+win8+wpa81" />
  <package id="sameerIOTApps.Plugin.SecureStorage" version="1.2.1" targetFramework="portable45-net45+win8+wpa81" />
  <package id="Xam.Plugin.Media" version="2.3.0" targetFramework="portable45-net45+win8+wpa81" />
  <package id="Xamarin.Forms" version="2.3.2.127" targetFramework="portable45-net45+win8+wpa81" />
  <package id="Xamarin.Forms.Maps" version="2.3.2.127" targetFramework="portable45-net45+win8+wpa81" />
</packages>

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="FAB.Forms" version="2.1.1" targetFramework="monoandroid60" />
  <package id="Microsoft.Bcl.Build" version="1.0.21" targetFramework="monoandroid60" />
  <package id="Xamarin.Android.Support.Animated.Vector.Drawable" version="23.3.0" targetFramework="monoandroid60" />
  <package id="Xamarin.Android.Support.Design" version="23.3.0" targetFramework="monoandroid60" />
  <package id="Xamarin.Android.Support.v4" version="23.3.0" targetFramework="monoandroid60" />
  <package id="Xamarin.Android.Support.v7.AppCompat" version="23.3.0" targetFramework="monoandroid60" />
  <package id="Xamarin.Android.Support.v7.CardView" version="23.3.0" targetFramework="monoandroid60" />
  <package id="Xamarin.Android.Support.v7.MediaRouter" version="23.3.0" targetFramework="monoandroid60" />
  <package id="Xamarin.Android.Support.v7.RecyclerView" version="23.3.0" targetFramework="monoandroid60" />
  <package id="Xamarin.Android.Support.Vector.Drawable" version="23.3.0" targetFramework="monoandroid60" />
  <package id="Xamarin.Forms" version="2.3.2.127" targetFramework="monoandroid60" />
  <package id="Xamarin.Forms.Maps" version="2.3.2.127" targetFramework="monoandroid60" />
  <package id="Xamarin.GooglePlayServices.Base" version="29.0.0.1" targetFramework="monoandroid60" />
  <package id="Xamarin.GooglePlayServices.Basement" version="29.0.0.1" targetFramework="monoandroid60" />
  <package id="Xamarin.GooglePlayServices.Maps" version="29.0.0.1" targetFramework="monoandroid60" />
</packages>

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="FAB.Forms" version="2.1.1" targetFramework="xamarinios10" />
  <package id="Microsoft.Bcl.Build" version="1.0.21" targetFramework="xamarinios10" />
  <package id="Xamarin.Forms" version="2.3.2.127" targetFramework="xamarinios10" />
  <package id="Xamarin.Forms.Maps" version="2.3.2.127" targetFramework="xamarinios10" />
</packages>
为什么会这样？我错过了什么？我该如何解决这个问题呢？

我也有类似的问题，但我使用的是Android。只需将项目父主题更改为任意主题。AppCompat~，这就解决了我的问题，也许你的问题也解决了。并将
global:：Xamarin.Forms.Platform.Android.FormsAppCompatActivity
添加到
MainActivity.cs
中

[Activity(Label = "YourName", , Theme = "@style/MyTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
        public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
        {
            protected override void OnCreate(Bundle bundle)
            {
                base.OnCreate(bundle);

                global::Xamarin.Forms.Forms.Init(this, bundle);

                FAB.Droid.FloatingActionButtonRenderer.InitControl();

                LoadApplication(new App());
            }
        }
您可以在
style.xml

<style
        name="MyTheme"
        parent="Base.AppTheme">
</style>

<style name="Base.AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
 <item name="windowActionBar">false</item>
 <item name="windowNoTitle">true</item>
</style>


假的
真的
您是否使用Activity extend MainActivity？我使用的是c#xamarin.forms而不是android。我的（
活动
/
页面
）正在扩展
内容页面
。啊，是的，在iOs上运行没有任何问题？我还没有在iOs上运行它。我现在关注的是droid部分。请把你的全班放在MainActivity.cs上。您的代码解决了这个错误，但给了我一个NullReferenceException。我能够从这两个建议中解决错误。但是解决这个问题导致了另一个错误
Java.Lang.IllegalStateException:这个活动已经有了一个由WindowDecor提供的操作栏。不要请求Window.FEATURE\u SUPPORT\u ACTION\u BAR，并在主题中将windowActionBar设置为false以使用工具栏。
（像往常一样）正因为如此，我才能够解决我的问题。我在主题样式中添加了
false-true
@mww我很乐意接受你的答案，只要你修改它来解决我面临的错误。再次感谢：）