从另一个活动调用活动功能

Question

我有两个活动A和B，我想从活动A调用活动B函数。我该怎么做？因此，我想在活动A中调用此函数。

 public void LoadXMLData()
    {
        var assembly = typeof(MainPage).GetTypeInfo().Assembly;
        Stream stream = assembly.GetManifestResourceStream("xmlEXAMPLE.persons.xml");
        ObservableCollection<Person> PersonInformation;
        var serializer = new XmlSerializer(typeof(ObservableCollection<Person>));
        PersonInformation = (ObservableCollection<Person>)serializer.Deserialize(stream);
        MyListView.ItemsSource = PersonInformation;

    }

Answer 1

您的项目是xamarin.forms还是xamarin.android吗？

最简单的方法是将活动设置为全局静态。

如果您的项目是xamarin.forms，则可以将page设置为static：

public partial class Page1 : ContentPage
{
    public static Page1 Instance;
    public Page1()
    {
        InitializeComponent();
        Instance = this;
    }

    //here is the method you want call in Page2
    public void DoInPage2()
    {
     .......
    }
}

然后在第2页中，您可以像Page1.Instance.DoInPage2();一样致电>

如果您的项目是xamarin.android，也可以将activity设置为static

public class ActivityA: Activity
{
    public static ActivityA Instance;

    protected override void OnCreate(Bundle savedInstanceState)
    {

        base.OnCreate(savedInstanceState);

        SetContentView(....);
        Instance = this;
    }

    //here is the method you want call in ActivityB
    public void CallInActivityB()
    {
      ...
    }
}
然后您可以在ActivityB中像ActivityA.Instance.CallInActivityB();一样调用它>