Xamarin-Android-啟動畫面（多個）

Question

我剛剛開始使用xamarin創建我的第一個android應用程序，但是我遇到了一個小問題。

我想在應用程序的開頭有兩個啟動屏幕。

我創建了第一個正常工作的，然后創建了第二個，然后是mainActivity。

但是由於某種原因，它沒有顯示第二個啟動屏幕。

如果我在第二行中刪除了這一行，那么它可以工作，但是不會轉到mainActivity。

StartActivity(typeof(MainActivity));

MainActivity.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

問題在於，因為您正在使用Thread.Sleep(3000)使UI線程處於休眠狀態，所以UI會凍結，並且新的Activity將在OnCreate方法返回之前啟動。

我建議使用計時器（例如： System.Timers.Timer ）在開始新活動之前等待三秒鍾。 這樣，UI不會凍結，並且OnCreate方法將返回。

我已根據我的建議修改了您的示例：

MainActivity.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++);
            };
        }
    }