在第一页状态栏上设置深色模式 xamarin forms android

Question

使用 xamarin 表单，我们正在添加在暗光模式之间切换的功能。一切都很好，但是 android 中的应用程序的第一页无论我做什么，状态栏颜色都不会改变。

我想在 android 项目中我必须在 OnCreate 之前调用 SetTheme(...)。

或者我是不是遗漏了什么？

问题如何根据主题设置状态栏颜色？一旦 android 加载

，下面的代码就不会改变

        public void SetStatusBarColor(System.Drawing.Color color, bool darkStatusBarTint)
    {
        var activity = Platform.CurrentActivity;
        var window = activity.Window;
        window?.AddFlags(WindowManagerFlags.DrawsSystemBarBackgrounds);
        window?.ClearFlags(WindowManagerFlags.TranslucentStatus);
        window?.SetStatusBarColor(color.ToPlatformColor());

        var flag = (StatusBarVisibility)SystemUiFlags.LightStatusBar;
        if (window != null)
        {
            window.DecorView.SystemUiVisibility = darkStatusBarTint ? flag : 0;
        }
    }

建议？谢谢

Answer 1

试试这个：

private void SetStatusBarColor(System.Drawing.Color color, bool darkStatusBarTint)
{
    var activity = Platform.CurrentActivity;
    var window = activity.Window;

    if (window != null)
    {
        window.AddFlags(WindowManagerFlags.DrawsSystemBarBackgrounds);
        window.ClearFlags(WindowManagerFlags.TranslucentStatus);
        window.SetStatusBarColor(color.ToPlatformColor());
        
        StatusBarVisibility flags = default;

        if (darkStatusBarTint)
            flags |= (StatusBarVisibility)SystemUiFlags.LightStatusBar;
        else
            flags &= ~(StatusBarVisibility)SystemUiFlags.LightStatusBar;

        window.DecorView.SystemUiVisibility = flags;
    }
}

或

private void SetStatusBarColor(System.Drawing.Color color, bool darkStatusBarTint)
{
    var activity = Platform.CurrentActivity;
    var window = activity.Window;

    if (window != null)
    {
        window.AddFlags(WindowManagerFlags.DrawsSystemBarBackgrounds);
        window.ClearFlags(WindowManagerFlags.TranslucentStatus);
        window.SetStatusBarColor(color.ToPlatformColor());

        window.DecorView.SystemUiVisibility = darkStatusBarTint
            ? (StatusBarVisibility)SystemUiFlags.LightStatusBar
            : StatusBarVisibility.Visible;
    }
}

两个函数都有效。

可以在MainActivity.OnCreate方法中更新StatusBar颜色，也可以监听App.Current.RequestedThemeChanged事件

public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
{
    protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);

        Xamarin.Essentials.Platform.Init(this, savedInstanceState);
        global::Xamarin.Forms.Forms.Init(this, savedInstanceState);
        LoadApplication(new App());
        
        ApplyStatusBarColor(App.Current.RequestedTheme);
        App.Current.RequestedThemeChanged += (s, e) => ApplyStatusBarColor(e.RequestedTheme);
    }

    private void ApplyStatusBarColor(Xamarin.Forms.OSAppTheme osAppTheme)
    {
        if (osAppTheme == Xamarin.Forms.OSAppTheme.Dark)
            SetStatusBarColor(Xamarin.Forms.Color.Blue, false);
        else
            SetStatusBarColor(Xamarin.Forms.Color.Yellow, true);
    }
}

在第一页状态栏上设置深色模式 xamarin forms android

Set DarkMode on the first page status bar xamarin forms android

xamarin.android

xamarin.forms