Xamarin Android、Xamarin Forms 方向更改 [英] Xamarin Android, Xamarin Forms orientation change

问题描述

使用 Xamarin Forms UI 框架的 Xamarin Android 应用.我检测到屏幕方向，并希望只允许特定页面的纵向和横向，而所有其他页面仅允许纵向.

Xamarin Android app that use the Xamarin Forms UI framework. I detect the screen orientation and want to only allow portrait and landscape for a specific Page but portrait only for all other pages.

我尝试调用 RequestOrientation 但这会强制方向保持不变并且不会再次触发我的方向更改通知.

I tried to call RequestOrientation but that force the orientation to stay the same and doesn't fire my orientation change notification again.

推荐答案

在你的 App.Xaml.cs 中有一个静态属性

Have a static property in your App.Xaml.cs

public static bool IsPortraitOnly { get; set; }

在所有页面中将其设置为 false，并在您希望它仅为纵向的页面中设置为 true.

Set it to false in all pages and to true in the page you want it to be Portrait only.

在你的 MainActivity 在 android 项目中，覆盖方法 OnConfigurationChanged :

In your MainActivity in android project, override the method OnConfigurationChanged :

    public override void OnConfigurationChanged(Configuration newConfig)
    {
        //using to prevent the OnCreate from firing when rotating or screen size is changing
        if (App.IsPortraitOnly)
        {
            RequestedOrientation = ScreenOrientation.Portrait;
            newConfig.Orientation = Orientation.Portrait;
        }
        base.OnConfigurationChanged(newConfig);
    } 

以下是android中可用的方向值:

The following are the available orientation values in android :

public enum Orientation
{
    Landscape = 2,
    Portrait = 1,
    Square = 3,
    Undefined = 0
}

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