Android一次只允许在屏幕上显示一个导航页面 [英] Android only allows one navigation page on screen at a time using

问题描述

以下2种实现之间有什么区别?

what is the difference between 2 implementations below?

 public App()
    {
        // The root page of your application
        MainPage = new Views.MainPage();
    }   
 public App()
    {     
        MainPage = new NavigationPage(new MainPage());
    }

如果我的主页继承了MasterDetailPage，则上面的第一个代码将起作用，但是第二个代码将返回错误消息，告诉我在调试我的android应用程序时"android一次只允许在屏幕上显示一个导航页面".

if my main page inherits MasterDetailPage, 1st code above will work but 2nd one will return error message telling me that "android only allows one navigation page on screen at a time" when I debug my android app.

  public class MainPage : MasterDetailPage
    {

        MasterPage masterPage;
        public MainPage()
        {
            masterPage = new MasterPage();
            Master = masterPage;
            Detail = new NavigationPage(new AnotherPage());

推荐答案

我可能对您要问的问题有点困惑，但是您是否正在做事

I might be a bit confused by what you are asking but if you are doing

MainPage = new NavigationPage(new MainPage());

您的主页是

public class MainPage : MasterDetailPage
{

    MasterPage masterPage;
    public MainPage()
    {
        masterPage = new MasterPage();
        Master = masterPage;
        Detail = new NavigationPage(new AnotherPage());

然后你在做

NavigationPage> MasterDetailPage> NavigationPage

NavigationPage > MasterDetailPage > NavigationPage

MasterDetail或Navigation应该是根，并且彼此之间不要有它们.彼此之间不能有2个导航页.

Either MasterDetail or Navigation should be the root and not have them inside each other. You can't have 2 navigation pages within each other.

这篇关于Android一次只允许在屏幕上显示一个导航页面的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！