我有以下可绘制对象
<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
android:color="?android:colorControlHighlight" >
<item>
<shape android:shape="oval" >
<solid android:color="?android:colorAccent" />
</shape>
</item>
我遇到了这个错误
<ripple> requires API level 21 (current min is 11)
我该如何解决这个问题?