Android类库中的函数FindById()始终返回null是否正常？
我想创建一个包含一些活动的库，以便您可以在各种项目中使用。为此，我在FindById()方法中调用OnCreate()。但是，它始终返回null。
答案 0 :(得分：1)
我的MonoDroid.ActionBar项目遇到了类似的问题。修复由Atsushi Enomoto提出，目前它是Xamarin.Android中的一个错误。
将此添加到您的项目中：
using System;
using System.Linq;
using System.Reflection;
using Android.Runtime;
namespace MonoDroid.ActionBar.Library
{
//From http://forums.xamarin.com/discussion/comment/5816/#Comment_5816
public static class ResourceIdManager
{
static bool _idInitialized;
public static void UpdateIdValues ()
{
if (_idInitialized)
return;
var eass = Assembly.GetExecutingAssembly ();
Func<Assembly,Type> f = ass =>
ass.GetCustomAttributes (typeof (ResourceDesignerAttribute), true)
.Select (ca => ca as ResourceDesignerAttribute)
.Where (ca => ca != null && ca.IsApplication)
.Select (ca => ass.GetType (ca.FullName))
.Where (ty => ty != null)
.FirstOrDefault ();
var t = f (eass);
if (t == null)
t = AppDomain.CurrentDomain.GetAssemblies ().Select (ass => f (ass)).Where (ty => ty != null).FirstOrDefault ();
if (t != null)
t.GetMethod ("UpdateIdValues").Invoke (null, new object [0]);
_idInitialized = true;
}
}
}
在使用您的观点之前，请在您的图书馆中致电ResourceIdManager.UpdateIdValues();。
答案 1 :(得分：0)
我想我发现了这个错误！
我的Android应用程序中的Resource.Designer.cs文件会生成我的Android类库的不同ID's Resource.designer.cs文件。
如何解决？
#pragma warning disable 1591
//------------------------------------------------------------------------------
// <auto-generated>
// This code was generated by a tool.
// Runtime Version:4.0.30319.18033
//
// Changes to this file may cause incorrect behavior and will be lost if
// the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------
[assembly: Android.Runtime.ResourceDesignerAttribute("Mono.Android.Plugins.Resource", IsApplication=false)]
namespace Mono.Android.Plugins
{
[System.CodeDom.Compiler.GeneratedCodeAttribute("Xamarin.Android.Build.Tasks", "1.0.0.0")]
public partial class Resource
{
Resource()
{
global::Android.Runtime.ResourceIdManager.UpdateIdValues ();
}
public partial class Attribute
{
private Attribute()
{
}
}
public partial class Drawable
{
// aapt resource value: 0x7f020000
public static int ic_stat_dismiss = 2130837504;
// aapt resource value: 0x7f020001
public static int ic_stat_ic_stat_snooze = 2130837505;
// aapt resource value: 0x7f020002
public static int ic_stat_notification = 2130837506;
// aapt resource value: 0x7f020003
public static int ic_stat_snooze = 2130837507;
// aapt resource value: 0x7f020004
public static int monoandroidsplash = 2130837508;
private Drawable()
{
}
}
public partial class Id
{
// aapt resource value: 0x7f060002
public static int dismiss_button = 2131099650;
// aapt resource value: 0x7f060001
public static int reminder_content = 2131099649;
// aapt resource value: 0x7f060000
public static int reminder_title = 2131099648;
// aapt resource value: 0x7f060003
public static int snooze_button = 2131099651;
private Id()
{
}
}
public partial class Layout
{
// aapt resource value: 0x7f030000
public static int monoandroidsplash = 2130903040;
// aapt resource value: 0x7f030001
public static int post_reminder = 2130903041;
private Layout()
{
}
}
public partial class String
{
// aapt resource value: 0x7f040002
public static int Hello = 2130968578;
// aapt resource value: 0x7f040001
public static int dismiss = 2130968577;
// aapt resource value: 0x7f040000
public static int snooze = 2130968576;
private String()
{
}
}
public partial class Style
{
// aapt resource value: 0x7f050000
public static int Mono_Android_Theme_Splash = 2131034112;
private Style()
{
}
}
}
}
#pragma warning restore 1591
#pragma warning disable 1591
//------------------------------------------------------------------------------
// <auto-generated>
// This code was generated by a tool.
// Runtime Version:4.0.30319.18033
//
// Changes to this file may cause incorrect behavior and will be lost if
// the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------
[assembly: Android.Runtime.ResourceDesignerAttribute("AndroidApplication1.Resource", IsApplication=true)]
namespace AndroidApplication1
{
[System.CodeDom.Compiler.GeneratedCodeAttribute("Xamarin.Android.Build.Tasks", "1.0.0.0")]
public partial class Resource
{
Resource()
{
global::Android.Runtime.ResourceIdManager.UpdateIdValues ();
}
public static void UpdateIdValues()
{
Mono.Android.Plugins.Resource.Drawable.ic_stat_dismiss = AndroidApplication1.Resource.Drawable.ic_stat_dismiss;
Mono.Android.Plugins.Resource.Drawable.ic_stat_ic_stat_snooze = AndroidApplication1.Resource.Drawable.ic_stat_ic_stat_snooze;
Mono.Android.Plugins.Resource.Drawable.ic_stat_notification = AndroidApplication1.Resource.Drawable.ic_stat_notification;
Mono.Android.Plugins.Resource.Drawable.ic_stat_snooze = AndroidApplication1.Resource.Drawable.ic_stat_snooze;
Mono.Android.Plugins.Resource.Drawable.monoandroidsplash = AndroidApplication1.Resource.Drawable.monoandroidsplash;
Mono.Android.Plugins.Resource.Id.dismiss_button = AndroidApplication1.Resource.Id.dismiss_button;
Mono.Android.Plugins.Resource.Id.reminder_content = AndroidApplication1.Resource.Id.reminder_content;
Mono.Android.Plugins.Resource.Id.reminder_title = AndroidApplication1.Resource.Id.reminder_title;
Mono.Android.Plugins.Resource.Id.snooze_button = AndroidApplication1.Resource.Id.snooze_button;
Mono.Android.Plugins.Resource.Layout.monoandroidsplash = AndroidApplication1.Resource.Layout.monoandroidsplash;
Mono.Android.Plugins.Resource.Layout.post_reminder = AndroidApplication1.Resource.Layout.post_reminder;
Mono.Android.Plugins.Resource.String.Hello = AndroidApplication1.Resource.String.Hello;
Mono.Android.Plugins.Resource.String.dismiss = AndroidApplication1.Resource.String.dismiss;
Mono.Android.Plugins.Resource.String.snooze = AndroidApplication1.Resource.String.snooze;
Mono.Android.Plugins.Resource.Style.Mono_Android_Theme_Splash = AndroidApplication1.Resource.Style.Mono_Android_Theme_Splash;
}
public partial class Attribute
{
private Attribute()
{
}
}
public partial class Drawable
{
// aapt resource value: 0x7f020000
public const int ic_stat_dismiss = 2130837504;
// aapt resource value: 0x7f020001
public const int ic_stat_ic_stat_snooze = 2130837505;
// aapt resource value: 0x7f020002
public const int ic_stat_notification = 2130837506;
// aapt resource value: 0x7f020003
public const int ic_stat_snooze = 2130837507;
// aapt resource value: 0x7f020004
public const int Icon = 2130837508;
// aapt resource value: 0x7f020005
public const int monoandroidsplash = 2130837509;
private Drawable()
{
}
}
public partial class Id
{
// aapt resource value: 0x7f060000
public const int button = 2131099648;
// aapt resource value: 0x7f060003
public const int dismiss_button = 2131099651;
// aapt resource value: 0x7f060002
public const int reminder_content = 2131099650;
// aapt resource value: 0x7f060001
public const int reminder_title = 2131099649;
// aapt resource value: 0x7f060004
public const int snooze_button = 2131099652;
private Id()
{
}
}
public partial class Layout
{
// aapt resource value: 0x7f030000
public const int Main = 2130903040;
// aapt resource value: 0x7f030001
public const int monoandroidsplash = 2130903041;
// aapt resource value: 0x7f030002
public const int post_reminder = 2130903042;
private Layout()
{
}
}
public partial class String
{
// aapt resource value: 0x7f040003
public const int ApplicationName = 2130968579;
// aapt resource value: 0x7f040002
public const int Hello = 2130968578;
// aapt resource value: 0x7f040001
public const int dismiss = 2130968577;
// aapt resource value: 0x7f040000
public const int snooze = 2130968576;
private String()
{
}
}
public partial class Style
{
// aapt resource value: 0x7f050000
public const int Mono_Android_Theme_Splash = 2131034112;
private Style()
{
}
}
}
}
#pragma warning restore 1591