android - Xamarin - Android - 启动画面(多个)

Question

我刚开始使用 xamarin 创建我的第一个 Android 应用程序，但遇到了一个小问题。

我想在应用程序的开头有 2 个启动画面。

我创建了第一个工作正常的，然后是第二个，然后是 mainActivity。

但是由于某些原因，它没有显示第二个初始屏幕。

如果我在第二行中删除这一行，那么它可以工作但不会转到 mainActivity。

StartActivity(typeof(MainActivity));

主 Activity .cs

[Activity(Theme = "@style/Theme.Splash1", MainLauncher = true, NoHistory = true)]
    public class SplashActivity1 : Activity
    {
        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            Thread.Sleep(3000); 

            StartActivity(typeof(SplashActivity2));
        }
    };

    [Activity(Theme = "@style/Theme.Splash2", NoHistory = true)]
    public class SplashActivity2 : Activity
    {
        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            Thread.Sleep(3000); 

            StartActivity(typeof(MainActivity));
        }
    };

    [Activity (Label = "coco1_droid", Icon = "@drawable/icon")]
    public class MainActivity : Activity
    {
        int count = 1;

        protected override void OnCreate (Bundle bundle)
        {
            base.OnCreate (bundle);

            // Set our view from the "main" layout resource
            SetContentView (Resource.Layout.Main);

            // Get our button from the layout resource,
            // and attach an event to it
            Button button = FindViewById<Button> (Resource.Id.myButton);

            button.Click += delegate {
                button.Text = string.Format ("{0} clicks!", count++);
            };
        }
    }

Answer 1

问题在于，因为您正在使用 Thread.Sleep(3000) 休眠 UI 线程，所以 UI 卡住并且新的 Activity 在 OnCreate 方法返回之前启动.

我建议使用计时器(例如:System.Timers.Timer)在开始新 Activity 之前等待三秒钟。这样 UI 就不会卡住并且 OnCreate 方法返回。

我已经根据我的建议修改了您的示例:

主 Activity .cs

[Activity(Theme = "@style/Theme.Splash1", MainLauncher = true, NoHistory = true)]
    public class SplashActivity1 : Activity
    {
        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            Timer timer = new Timer();
            timer.Interval = 3000; // 3 sec.
            timer.AutoReset = false; // Do not reset the timer after it's elapsed
            timer.Elapsed += (object sender, ElapsedEventArgs e) =>
            {
                StartActivity(typeof(SplashActivity2));
            };
            timer.Start();
        }
    };

    [Activity(Theme = "@style/Theme.Splash2", NoHistory = true)]
    public class SplashActivity2 : Activity
    {
        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            Timer timer = new Timer();
            timer.Interval = 3000; // 3 sec.
            timer.AutoReset = false; // Do not reset the timer after it's elapsed
            timer.Elapsed += (object sender, ElapsedEventArgs e) =>
            {
                StartActivity(typeof(MainActivity));
            };
            timer.Start();
        }
    };

    [Activity (Label = "coco1_droid", Icon = "@drawable/icon")]
    public class MainActivity : Activity
    {
        int count = 1;

        protected override void OnCreate (Bundle bundle)
        {
            base.OnCreate (bundle);

            // Set our view from the "main" layout resource
            SetContentView (Resource.Layout.Main);

            // Get our button from the layout resource,
            // and attach an event to it
            Button button = FindViewById<Button> (Resource.Id.myButton);

            button.Click += delegate {
                button.Text = string.Format ("{0} clicks!", count++);
            };
        }
    }