Android 可旋转的饼图，在图表停止后，我们需要知道哪个部分是向下的

我的要求是：

1.Create a custom widget in android. It should be One Pie Chart which is having 4 
     slices as shown in diagram.
2.Display Icon at center of the Pie chart it should be constant
3.Make pie chart rotatable. We should be able  to grab it and rotate it like 
       a spinning wheel.
4.After the chart stops we need to know which slice is pointing downwards. 
    Show it a text view. For e.g. in the diagram it would say Purple.

通过使用这个，我可以旋转派字符。但我无法在饼图和如何确定哪个切片指向下方之间显示图像。如果有人知道这一点，请给出建议或想法

您是否尝试过？？也可以通过一些修改对您有所帮助