问题

当我运行我的第一个（主要）android活动并更改屏幕方向时，该应用程序正常工作，我可以不断改变方向它仍然有效。

当我点击第一个活动上的按钮进入第二个活动时，屏幕发生变化，一切都很好，我上下滚动（一切都很好）

但是，当我现在切换方向时（在第二个活动上），活动将关闭，没有日志错误，并恢复为第一个活动。

所以我的问题是如何保留切换屏幕方向而不关闭第二个活动的能力？不确定是什么导致了这一点。我已经读过，无论何时屏幕方向发生变化，它都必须销毁并重新创建活动。但是如果它正在处理第一个活动，那为什么它不能用于第二个活动？

这是第一个活动代码：

    [Activity(Label = "FishinTales: Main Menu", MainLauncher = true, Icon = "@drawable/icon")]
public class Activity_View_MainMenu : Activity
{
    #region Components
    private Model n_model;
    private GridView n_mainMenuGridView;
    #endregion

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

        /*
            Load data using if statements. Load serializeable if no settings file.
            Or create new and test if it is accurately passing the custom class to another activity.
        */
        if (((MyApp) this.ApplicationContext).FishingData == null)
        {
            ((MyApp) this.ApplicationContext).LoadFishinTales();
            this.n_model = ((MyApp) this.ApplicationContext).FishingData;
        }
        else
        {
            this.n_model = ((MyApp) this.ApplicationContext).FishingData;
        }


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

        this.n_mainMenuGridView = FindViewById<GridView> (Resource.Id.xml_mainMenuGridView);
        this.n_mainMenuGridView.SetNumColumns(2);
        this.n_mainMenuGridView.Adapter = new MainMenuGridAdapter (this);

        this.n_mainMenuGridView.ItemClick += (o, e) => {
            if (e.Position == 0)
            {
                // Navigate to Fish Species
                Intent intent = new Intent(this, typeof(Activity_View_FishSpecies));
                this.StartActivityForResult(intent, RequestCodes.View_FishSpecies);
            }
            else if (e.Position == 1)
            {
                // Navigate to My Favorite Spots
                Toast.MakeText(this, "TODO: Navigate to My Favorite Sports", ToastLength.Long).Show();
                //Intent intent = new Intent(this, typeof(View_MyFavoriteSpots));
                //this.StartActivityForResult(intent, RequestCodes.View_MyFavoriteSpots);
            }
            else if (e.Position == 2)
            {
                // Navigate to My Season
                Toast.MakeText(this, "TODO: Navigate to My Season", ToastLength.Long).Show();
                //Intent intent = new Intent(this, typeof(View_MySeason));
                //this.StartActivityForResult(intent, RequestCodes.View_MySeason);
            }
            else if (e.Position == 3)
            {
                // Navigate to Inventory
                Toast.MakeText(this, "TODO: Navigate to Inventory", ToastLength.Long).Show();
                //Intent intent = new Intent(this, typeof(View_Inventory));
                //this.StartActivityForResult(intent, RequestCodes.View_Inventory);
            }
            else if (e.Position == 4)
            {
                // Navigate to Fishing News
                Toast.MakeText(this, "TODO: Navigate to Fishing News", ToastLength.Long).Show();
                //Intent intent = new Intent(this, typeof(View_FishingNews));
                //this.StartActivityForResult(intent, RequestCodes.View_FishingNews);
            }
            else if (e.Position == 5)
            {
                // Navigate to Settings
                Toast.MakeText(this, "TODO: Navigate to Settings", ToastLength.Long).Show();
                //Intent intent = new Intent(this, typeof(View_Settings));
                //this.StartActivityForResult(intent, RequestCodes.View_Settings);
            }
            else
            {
                // Invalid Response
                Toast.MakeText(this, "Invalid Menu Selection", ToastLength.Long).Show();
            }
        };
    }

    protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
    {
        // Possibly save data after activity result.?.
    }
}

这是我的第一个活动的图像（改变方向的活动没有问题）：

First Activity - Main Menu

这是第二个活动代码：

    [Activity(Label = "FishinTales: Fish Species")]
public class Activity_View_FishSpecies : Activity
{
    #region Components
    private Model n_model;
    private ListView n_fishSpeciesListView;
    #endregion

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

        // Get Application Global Model
        this.n_model = ((MyApp) this.ApplicationContext).FishingData;

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

        this.n_fishSpeciesListView = FindViewById<ListView> (Resource.Id.xml_fishSpeciesListView);
        this.n_fishSpeciesListView.Adapter = new FishSpeciesListAdapter (this.ApplicationContext, this.n_model.SpecieManager.Species);
    }
}

这是我的第二个活动的图像（在我尝试通过倾斜手机将其设置为横向方向后关闭的活动）：

Second Activity - Fish Species List

知道为什么会发生这种情况甚至更好，对于这种情况会有什么好处？请记住，我不希望屏幕保持一定的方向。我希望如果用户可以在两者之间切换，而不关闭它们。感谢您的阅读和帮助。

Answer 1

在Manifest xml中添加第二个活动

<activity android:name="com.package.SecondActivity" android:configChanges="keyboard|keyboardHidden|orientation" />

Answer 2

我尝试重现你的问题，对我来说，第二项活动没有关闭，但在我倾斜手机时正确旋转。但是，当然，我没有你的布局和图像。所以看起来问题不在你发布的代码中，而是在其他地方。很可能你有空间问题（我在使用图像时也遇到了内存问题）。要检查这一点，请尝试注释掉适配器或加载图像的适配器中的代码。在我的情况下，我不得不重新调整图像以保持它们的小。此外，适配器的代码可能会有所帮助。希望这会有所帮助。

屏幕更改方向后第二个活动关闭。 [Mono Android]

问题

2 个答案: