如何在Xamarin.Android中使用ObjectAnimator以编程方式使用提供的PathData创建动画？

我尝试使用ObjectAnimator和PathData作为属性名创建动画

我使用的xml代码：

<objectAnimator
android:duration="166"
android:propertyName="pathData"
android:valueFrom="M -7,-7 l 14,0 c 0,0 0,0 0,0 l 0,14 c 0,0 0,0 0,0 l -14,0 c 0,0 0,0 0,0 l 0,-14 c 0,0 0,0 0,0 Z M 7,-9 c 0,0 -14,0 -14,0 c -1.1044921875,0 -2,0.8955078125 -2,2 c 0,0 0,14 0,14 c 0,1.1044921875 0.8955078125,2 2,2 c 0,0 14,0 14,0 c 1.1044921875,0 2,-0.8955078125 2,-2 c 0,0 0,-14 0,-14 c 0,-1.1044921875 -0.8955078125,-2 -2,-2 c 0,0 0,0 0,0 Z"
android:valueTo="M 0,-0.05 l 0,0 c 0.02761423749,0 0.05,0.02238576251 0.05,0.05 l 0,0 c 0,0.02761423749 -0.02238576251,0.05 -0.05,0.05 l 0,0 c -0.02761423749,0 -0.05,-0.02238576251 -0.05,-0.05 l 0,0 c 0,-0.02761423749 0.02238576251,-0.05 0.05,-0.05 Z M 7,-9 c 0,0 -14,0 -14,0 c -1.1044921875,0 -2,0.8955078125 -2,2 c 0,0 0,14 0,14 c 0,1.1044921875 0.8955078125,2 2,2 c 0,0 14,0 14,0 c 1.1044921875,0 2,-0.8955078125 2,-2 c 0,0 0,-14 0,-14 c 0,-1.1044921875 -0.8955078125,-2 -2,-2 c 0,0 0,0 0,0 Z"
android:valueType="pathType"/>

如何使用Xamarin.Android中的ObjectAnimator以编程方式使用提供的PathData创建动画？

根据这一点，您需要重写以接受字符串，而不是TypedArray。为此，您需要安装nuget软件包。您可以使用以下方法安装它：

Install-Package VectorCompat -Version 1.0.5

在xamarin中，还需要创建

PathDataEvaluator

。
例如，

PathDataEvaluator

：

public class PathDataEvaluator : Java.Lang.Object, ITypeEvaluator
{
    private PathParser.PathDataNode[] mNodeArray;
    private PathDataEvaluator() { }

    public PathDataEvaluator(PathParser.PathDataNode[] nodeArray)
    {
        mNodeArray = nodeArray;
    }

    public Java.Lang.Object Evaluate(float fraction, Java.Lang.Object startValue, Java.Lang.Object endValue)
    {
        PathParser.PathDataNode[] startPathData =startValue.ToArray<PathParser.PathDataNode>();
        PathParser.PathDataNode[] endPathData = endValue.ToArray<PathParser.PathDataNode>();

        if (!PathParser.CanMorph(startPathData, endPathData))
        {
            throw new IllegalArgumentException("Can't interpolate between"
                    + " two incompatible pathData");
        }
        if (mNodeArray == null || !PathParser.CanMorph(mNodeArray, startPathData))
        {
            mNodeArray = PathParser.DeepCopyNodes(startPathData);
        }
        for (int i = 0; i < startPathData.Length; i++)
        {
            mNodeArray[i].InterpolatePathDataNode(startPathData[i],
                    endPathData[i], fraction);
        }
        return mNodeArray;
    }
}

        ObjectAnimator objectAnimator = new ObjectAnimator();
        objectAnimator.SetTarget(TARGET);
        objectAnimator.PropertyName = "pathData";
        PathDataEvaluator evaluator = null;
        string fromString = "M -7,-7 l 14,0 c 0,0 0,0 0,0 l 0,14 c 0,0 0,0 0,0 l -14,0 c 0,0 0,0 0,0 l 0,-14 c 0,0 0,0 0,0 Z M 7,-9 c 0,0 -14,0 -14,0 c -1.1044921875,0 -2,0.8955078125 -2,2 c 0,0 0,14 0,14 c 0,1.1044921875 0.8955078125,2 2,2 c 0,0 14,0 14,0 c 1.1044921875,0 2,-0.8955078125 2,-2 c 0,0 0,-14 0,-14 c 0,-1.1044921875 -0.8955078125,-2 -2,-2 c 0,0 0,0 0,0 Z";
        string toString = "M 0,-0.05 l 0,0 c 0.02761423749,0 0.05,0.02238576251 0.05,0.05 l 0,0 c 0,0.02761423749 -0.02238576251,0.05 -0.05,0.05 l 0,0 c -0.02761423749,0 -0.05,-0.02238576251 -0.05,-0.05 l 0,0 c 0,-0.02761423749 0.02238576251,-0.05 0.05,-0.05 Z M 7,-9 c 0,0 -14,0 -14,0 c -1.1044921875,0 -2,0.8955078125 -2,2 c 0,0 0,14 0,14 c 0,1.1044921875 0.8955078125,2 2,2 c 0,0 14,0 14,0 c 1.1044921875,0 2,-0.8955078125 2,-2 c 0,0 0,-14 0,-14 c 0,-1.1044921875 -0.8955078125,-2 -2,-2 c 0,0 0,0 0,0 Z";
        PathParser.PathDataNode[] nodesFrom = PathParser.CreateNodesFromPathData(fromString);
        PathParser.PathDataNode[] nodesTo = PathParser.CreateNodesFromPathData(toString);
        if (nodesFrom != null)
        {
            if (nodesTo != null)
            {
                objectAnimator.SetObjectValues(nodesFrom, nodesTo);

                if (!PathParser.CanMorph(nodesFrom, nodesTo))
                {
                    throw new InflateException(" Can't morph from " + fromString + " to " + toString);
                }
            }
            else
            {
                objectAnimator.SetObjectValues((Object)nodesFrom);
            }
            evaluator = new PathDataEvaluator(PathParser.DeepCopyNodes(nodesFrom));
        }
        else if (nodesTo != null)
        {
            objectAnimator.SetObjectValues((Object)nodesTo);
            evaluator = new PathDataEvaluator(PathParser.DeepCopyNodes(nodesTo));
        }

        objectAnimator.SetEvaluator(evaluator);
        objectAnimator.SetDuration(166);
        objectAnimator.Start();

---

你可以参考这篇文章了解更多信息。

你好，你的问题没有意义。你能清楚地知道你到底想做什么吗，动画好的，但是什么样的动画？我遇到了这个错误。。。obj\Debug\lp\3\jl\res\values-v21\values.xml:1:错误：检索项的父项时出错：未找到与给定名称“Widget.AppCompat.Button”匹配的资源。是否安装了

Xamarin.Android.Support.v7.AppCompat

软件包？是的，我仍然面临相同的问题issue@yoganathank您的目标api级别和最低api级别是什么？Android 5.1 API22