如何在Xamarin Android中扩展应用程序类

问题描述

我想扩展Android应用程序，并且想重写oncreate方法.但是由于某种原因，它非常可怕...仅当我删除[Application]时，我才能运行它，但是根据此链接，我们必须添加[Application]

I want to extend the Android application and I want to override oncreate method.But for some reason its been very terrible...Only if I remove [Application] I am able to run it but according to this link we have to add [Application]

[Application]
public class MainApp : Application
{
public MainApp(IntPtr javaReference, JniHandleOwnership transfer) : base(javaReference, transfer)
{
}

public override void OnCreate()
{
    base.OnCreate();
    //app init ...
}
}

有人可以告诉我在xamarin android上扩展应用程序类的正确方法是什么

Can anybody clarify me what is the rightway to extend application class in xamarin android

更新

如果我不删除[应用程序]，我将得到以下错误

If I don't remove [application] I am exactly getting the below error

如果我的应用程序可以编译，但是会在运行时错误之后抛出

If I application then it compiles but it throws following runtime error

这是我的清单文件

推荐答案

在 AssemblyInfo.cs

In AssemblyInfo.cs

评论

     #if DEBUG
    [Application(Debuggable=true)]
    #else
    [Application(Debuggable = false)]
    #endif

并将其移至应用程序顶部

and move that on top of your application

#if DEBUG
[Application(Debuggable=true)]
#else
[Application(Debuggable = false)]
#endif
public class MainApp : Application
{
public MainApp(IntPtr javaReference, JniHandleOwnership transfer) : base(javaReference, transfer)
{
}

public override void OnCreate()
{
    base.OnCreate();
    //app init ...
}
}

基本上，您已经在两个地方定义了它，这就是为什么发生此问题的原因.在AssemblyInfo.cs中注释掉并添加扩展类即可解决

Basically you have defined it two places that's why this problem occurs.Commenting out in AssemblyInfo.cs and adding in the extended class will work out

仅供参考:

清单还可以

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