Question

使用XamarinStudio及以下代码基于本教程中的Sample。这里是问题。

我是否需要从Project Option＆gt;生成AndroidManifest？测试应用程序时的Android应用程序？

为什么没有数据传递，即使我已经生成了AndroidManifest，代码：


---Activity 1  

[Activity (Label = "HelloMultiScreen", MainLauncher = true,Icon = "@drawable/icon")]

    public class FirstActivity : Activity

    {

        int count = 1;



        protected override void OnCreate (Bundle bundle)

        {

            base.OnCreate (bundle);



            //Use UI created in Main.axml

            SetContentView (Resource.Layout.Main);



            var showSecond = FindViewById (Resource.Id.showSecond);

            showSecond.Click += (sender, e) => {

                var second = new Intent(this, typeof(SecondActivity));

                second.PutExtra("FirstData", "Data from FirstActivity");

                StartActivity (typeof(SecondActivity));

            };

        }

    }


---Activity 2

    [Activity (Label = "SecondActivity")]           

    public class SecondActivity : Activity

    {

        protected override void OnCreate (Bundle bundle)

        {

            base.OnCreate (bundle);


            // Create your application here


            SetContentView (Resource.Layout.Second);

            var label = FindViewById (Resource.Id.screen2Label);

            label.Text = Intent.GetStringExtra("FirstData") ?? "Data not available";

        }

    }

由于

Answer 1

好的，当我自己重新制作项目时，我发现了问题。问题在于这段代码：

var second = new Intent(this, typeof(SecondActivity));
second.PutExtra("FirstData", "Data from FirstActivity");
StartActivity (typeof(SecondActivity));

您会使用正确的数据制作Intent。但是，如果没有这些数据，您就会开始新的活要修复它，请将代码更改为：

var second = new Intent(this, typeof(SecondActivity));
second.PutExtra("FirstData", "Data from FirstActivity");
StartActivity(second);`

为什么数据无法传递给第二个活动

1 个答案: