ObjectAnimator代理以动画TOPMARGIN无法找到设置/吸气 [英] ObjectAnimator Proxy to Animate TopMargin can't find setting/getter

问题描述

我们正在尝试使用objectanimator代理动画的安卓（Xamarin）的TOPMARGIN属性。

We are trying to use an objectanimator proxy to animate the TopMargin property in Android (Xamarin).

不过，我们得到这个错误：

However, we get this error:

[PropertyValues​​Holder]找不到二传手/ getter方法​​属性   值类型为浮动TOPMARGIN

[PropertyValuesHolder] Couldn't find setter/getter for property TopMargin with value type float

请注意：我们尝试TOPMARGIN，TOPMARGIN，GetTopMargin，getTopMargin等，认为它可能是介乎Java和C＃套管转换的问题，但它不看是这样

Note: we tried TopMargin, topMargin, GetTopMargin, getTopMargin, etc., thinking that it might be an issue of casing conversion betwen Java and C#, but it doesn't look to be the case.

我们的code。在活动启动动画：

Our code in the Activity starting the animation:

translation = new int[] {0, 300};
var anim2 = ObjectAnimator.OfInt( new MarginProxyAnimator(myview), "TopMargin",translation);
anim2.SetDuration(500);
anim2.Start(); 

我们的代理类：

public class MarginProxyAnimator : Java.Lang.Object 
{
///... other code...
    public int getTopMargin() {
    var lp = (ViewGroup.MarginLayoutParams)mView.LayoutParameters;
    return lp.TopMargin;
    }

    public void setTopMargin(int margin) {
    var lp = (ViewGroup.MarginLayoutParams)mView.LayoutParameters;
        lp.SetMargins(lp.LeftMargin, margin, lp.RightMargin, lp.BottomMargin);
    mView.RequestLayout();
    }
}

任何建议？一个指向使用代理工作Xamarin样品将是有益的。

Any advise? a pointer to a working Xamarin sample using a proxy would be helpful.

感谢。

推荐答案

您需要将[出口]属性添加到您的getTopMargin和setTopMargin方法。例如，

You need to add the [Export] attribute to your getTopMargin and setTopMargin methods. E.G.

[Export]
public int getTopMargin()
{
  var lp = (ViewGroup.MarginLayoutParams)mView.LayoutParameters;
  return lp.TopMargin;
}

[Export]
public void setTopMargin(int margin)
{
  var lp = (ViewGroup.MarginLayoutParams)mView.LayoutParameters;
  lp.SetMargins(lp.LeftMargin, margin, lp.RightMargin, lp.BottomMargin);
  mView.RequestLayout();
}

[导出]属性还要求你添加一个引用Mono.Android.Export组装。

The [Export] attribute also requires that you add a reference to the Mono.Android.Export assembly.

文件：

http://androidapi.xamarin.com/?link=T% 3aJava.Interop.ExportAttribute

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