本文介绍了尝试通过 AppShell 时无法找到资源 ID #0xffffffff的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我已经尝试并尝试过我在网上找到的解决方案，但到目前为止都没有奏效.
I've tried and tried solutions I find online and none have worked so far.
我有一个带有 LogInPage 和 LoggedInPage 的 Xamarin 应用.开始时，我导航到 TabBar 中托管的 LogInPage，因此 FlyoutMenu 不可见，当用户正确登录时，我尝试将 Shell 移至 LoggedInPage，它是 FlyoutMenu 的一部分.
I have a Xamarin app with a LogInPage and a LoggedInPage. On start I navigate to the LogInPage, hosted within a TabBar, so the FlyoutMenu is not visible, and when the user logs in correctly I try to move the Shell to the LoggedInPage, which is part of a FlyoutMenu.
但是，应用程序崩溃并返回以下响应:
However, the app crashes and it returns the following response:
Android.Content.Res.Resources+NotFoundException Message=无法查找资源 ID #0xffffffff
我的代码如下:
应用
<Application xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="FinalProject.App">
<Application.Resources>
<ResourceDictionary>
<Style TargetType="Button">
<Setter Property="TextColor" Value="White"></Setter>
<Setter Property="VisualStateManager.VisualStateGroups">
<VisualStateGroupList>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal">
<VisualState.Setters>
<Setter Property="BackgroundColor" Value="DodgerBlue" />
</VisualState.Setters>
</VisualState>
<VisualState x:Name="Disabled">
<VisualState.Setters>
<Setter Property="BackgroundColor" Value="Transparent" />
</VisualState.Setters>
</VisualState>
</VisualStateGroup>
</VisualStateGroupList>
</Setter>
</Style>
</ResourceDictionary>
</Application.Resources>
</Application>
应用程序外壳
<Shell x:Name="MainShell" xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="FinalProject.AppShell"
Title="FinalProject"
xmlns:core="clr-namespace:FinalProject"
xmlns:coreviews="clr-namespace:FinalProject.Views">
<Shell.Resources>
<ResourceDictionary>
<Style x:Key="BaseStyle" TargetType="Element">
<Setter Property="Shell.BackgroundColor" Value="DodgerBlue" />
<Setter Property="Shell.ForegroundColor" Value="White" />
<Setter Property="Shell.TitleColor" Value="White" />
<Setter Property="Shell.DisabledColor" Value="Transparent" />
<Setter Property="Shell.UnselectedColor" Value="Transparent" />
<Setter Property="Shell.TabBarBackgroundColor" Value="DodgerBlue" />
<Setter Property="Shell.TabBarForegroundColor" Value="White"/>
<Setter Property="Shell.TabBarUnselectedColor" Value="Transparent"/>
<Setter Property="Shell.TabBarTitleColor" Value="White"/>
</Style>
<Style TargetType="TabBar" BasedOn="{StaticResource BaseStyle}" />
<Style TargetType="FlyoutItem" BasedOn="{StaticResource BaseStyle}" />
<Style Class="FlyoutItemLabelStyle" TargetType="Label">
<Setter Property="TextColor" Value="White"></Setter>
</Style>
<Style Class="FlyoutItemLayoutStyle" TargetType="Layout" ApplyToDerivedTypes="True">
<Setter Property="VisualStateManager.VisualStateGroups">
<VisualStateGroupList>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal">
<VisualState.Setters>
<Setter Property="BackgroundColor" Value="{x:OnPlatform UWP=Transparent, iOS=White}" />
<Setter TargetName="FlyoutItemLabel" Property="Label.TextColor" Value="DodgerBlue" />
</VisualState.Setters>
</VisualState>
<VisualState x:Name="Selected">
<VisualState.Setters>
<Setter Property="BackgroundColor" Value="DodgerBlue" />
</VisualState.Setters>
</VisualState>
</VisualStateGroup>
</VisualStateGroupList>
</Setter>
</Style>
<Style Class="MenuItemLayoutStyle" TargetType="Layout" ApplyToDerivedTypes="True">
<Setter Property="VisualStateManager.VisualStateGroups">
<VisualStateGroupList>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal">
<VisualState.Setters>
<Setter TargetName="FlyoutItemLabel" Property="Label.TextColor" Value="DodgerBlue" />
</VisualState.Setters>
</VisualState>
</VisualStateGroup>
</VisualStateGroupList>
</Setter>
</Style>
</ResourceDictionary>
</Shell.Resources>
<FlyoutItem Title="Main">
<ShellContent Route="LoggedPage" ContentTemplate="{DataTemplate coreviews:LoggedPage}" />
</FlyoutItem>
<FlyoutItem Title="Trial">
<ShellContent Route="TrialPage" ContentTemplate="{DataTemplate coreviews:TrialPage}" />
</FlyoutItem>
<MenuItem Text="Logout" StyleClass="MenuItemLayoutStyle" Clicked="Logout">
</MenuItem>
<TabBar>
<ShellContent Route="LoginPage" ContentTemplate="{DataTemplate coreviews:LogInPage}" />
</TabBar>
登录页面.xaml:
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="FinalProject.Views.LogInPage"
BackgroundColor="White">
<ContentPage.Content>
<StackLayout
VerticalOptions="Center"
Margin="20">
<Label
Text="Caminante"
HorizontalOptions="Center"
TextColor="Black"
FontSize="35"
Margin="0, 20"
/>
<Entry
Placeholder="E-mail"
PlaceholderColor="Black"
TextColor="Black"
Keyboard="Email"
x:Name="EmailInput"
/>
<Entry
Placeholder="Password"
PlaceholderColor="Black"
TextColor="Black"
IsPassword="true"
x:Name="PasswordInput"
/>
<Button
Text="Enter"
Clicked="LoginClicked"
Margin="60, 40"
BackgroundColor="DodgerBlue"
TextColor="White"
/>
<Button
Text="Register"
Clicked="RegisterClicked"
Margin="60, 40"
BackgroundColor="DodgerBlue"
TextColor="White"
/>
</StackLayout>
</ContentPage.Content>
</ContentPage>
LogInPage.xaml.cs
LogInPage.xaml.cs
using FinalProject.Services;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
namespace FinalProject.Views
{
[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class LogInPage : ContentPage
{
IAuth auth;
public LogInPage()
{
InitializeComponent();
auth = DependencyService.Get<IAuth>();
//Routing
}
async void LoginClicked(object sender, EventArgs e)
{
string Token = await auth.LoginWithEmailPassword(EmailInput.Text, PasswordInput.Text);
if (Token != "")
{
Storage.uid = Token;
Storage.userEmail = EmailInput.Text;
await Shell.Current.GoToAsync("///LoggedPage");
//Application.Current.MainPage = new AppShell();
}
else
{
ShowError();
}
}
async void RegisterClicked(object sender, EventArgs e)
{
await auth.RegisterWithEmailPassword(EmailInput.Text, PasswordInput.Text);
string Token = await auth.LoginWithEmailPassword(EmailInput.Text, PasswordInput.Text);
await FireBaseActions.AddUser(Token, EmailInput.Text);
LoginClicked(sender, e);
}
async private void ShowError()
{
await DisplayAlert("Authentication Failed", "E-mail or password are incorrect. Try again!", "OK");
}
}
}
LoggedPage.xaml
LoggedPage.xaml
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="FinalProject.Views.LoggedPage">
<ContentPage.Content>
<StackLayout x:Name="slLoggedIn1">
<Label Text="Working?"/>
</StackLayout>
</ContentPage.Content>
</ContentPage>
LoggedPage.xaml.cs
LoggedPage.xaml.cs
namespace FinalProject.Views
{
[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class LoggedPage : ContentPage
{
public string noChars { get; set; }
public List<Character> lista { get; set; }
public bool Visible { get; set; }
public bool notVisible { get { return !Visible; } }
public LoggedPage()
{
BindingContext = this;
noChars = "Hello, " + Services.Storage.userEmail + "!" + Environment.NewLine + "It seems you don't have any characters yet, press the button below to fix that.";
if (FireBaseActions.GetUserCharacters().Result.Count.Equals(0) || FireBaseActions.GetUserCharacters().Result.Equals(null))
{
lista = new List<Character>();
Visible = false;
}
else
{
lista = FireBaseActions.GetUserCharacters().Result;
Visible = true;
}
InitializeComponent();
}
根据评论者的建议添加了 IAuth.
Added IAuth by a commenter's suggestion.
IAuth 实现类:
[assembly: Dependency(typeof(AuthDroid))]
namespace CaminanteFinal.Droid
{
class AuthDroid : IAuth
{
public async Task<string> LoginWithEmailPassword(string email, string password)
{
try
{
var user = await FirebaseAuth.Instance.SignInWithEmailAndPasswordAsync(email, password);
var token = await (FirebaseAuth.Instance.CurrentUser.GetIdToken(false).AsAsync<GetTokenResult>());
//return FirebaseAuth.Instance.CurrentUser.Uid;
return token.Token;
}
catch (FirebaseAuthInvalidUserException e)
{
Acr.UserDialogs.UserDialogs.Instance.Alert(e.ErrorCode, "Error", "Ok");
e.PrintStackTrace();
return "";
}
catch (FirebaseAuthInvalidCredentialsException e)
{
Acr.UserDialogs.UserDialogs.Instance.Alert(e.ErrorCode, "Error", "Ok");
e.PrintStackTrace();
return "";
}
}
public async Task<string> RegisterWithEmailPassword(string email, string password)
{
try
{
var user = await FirebaseAuth.Instance.CreateUserWithEmailAndPasswordAsync(email, password);
Acr.UserDialogs.UserDialogs.Instance.Alert("User " + email + " with password " + password + " has been created.", "Success!", "Ok");
return "";
}
catch (FirebaseAuthUserCollisionException e)
{
Acr.UserDialogs.UserDialogs.Instance.Alert(e.ErrorCode, "Error", "Ok");
e.PrintStackTrace();
return "";
}
catch (FirebaseAuthWeakPasswordException e)
{
Acr.UserDialogs.UserDialogs.Instance.Alert(e.ErrorCode, "Error", "Ok");
e.PrintStackTrace();
return "";
}
catch (FirebaseAuthInvalidCredentialsException e)
{
Acr.UserDialogs.UserDialogs.Instance.Alert(e.ErrorCode, "Error", "Ok");
e.PrintStackTrace();
return "";
}
}
}
}
推荐答案
这是 Xamarin.Forms 的问题，它已经是 在 github 上跟踪.
This is an issue with Xamarin.Forms, which is already tracked on github.
此 PR 合并后，您需要等待 XF5 的下一个 SR 或回滚到 XF 4.8
You need to wait for next SR for XF5 when this PR is merged or rollback to XF 4.8
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