我能够在Xamarin Forms中获得阴影效果,我很确定它可以类似地用于框架。我从Android Documentation
线索,我添加了一个名为HasShadow新属性
public static readonly BindableProperty HasShadowProperty =
BindableProperty.Create("HasShadow", typeof(bool), typeof(ExtendedBoxView), false);
public bool HasShadow
{
get { return (bool)GetValue(HasShadowProperty); }
set { SetValue(HasShadowProperty, value); }
}
下面是Android的
public class ExtendedBoxViewRenderer : BoxRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs<BoxView> e)
{
base.OnElementChanged(e);
var element = e.NewElement as ExtendedBoxView;
if (element == null) return;
if (element.HasShadow)
{
ViewGroup.Elevation = 8.0f;
ViewGroup.TranslationZ = 10.0f;
}
}
}
渲染器的代码,这是它的外观
UPDATE
我发现这种方法导致应用程序崩溃的老版本的Android。虽然我还没有找到一种方法来显示Lollipop之前的Android版本中的Shadows。这将防止任何应用程序崩溃
public class ExtendedBoxViewRenderer : BoxRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs<BoxView> e)
{
base.OnElementChanged(e);
var element = e.NewElement as ExtendedBoxView;
if (element == null) return;
if (element.HasShadow)
{
//For some reason ViewCompat has issues when running in debug hence the workaround.
#if DEBUG
double dAndroidVersion;
if (double.TryParse(Build.VERSION.Release, out dAndroidVersion))
{
if (dAndroidVersion < 21)
return;
}
#else
ViewCompat.SetElevation(ViewGroup, 8.0f);
ViewCompat.SetTranslationZ(ViewGroup, 10.0f);
#endif
}
}
}
谢谢你,它的工作;) –