如何将这个RotateAnimation()格式的XML转换成java中的浮点值？

// 解析XML文件
XmlPullParser parser = getResources().getXml(R.xml.rotate_animation);

float fromDegrees = 0.0f;
float toDegrees = 0.0f;
float pivotX = 0.0f;
float pivotY = 0.0f;

try {
    while (parser.getEventType() != XmlPullParser.END_DOCUMENT) {
        if (parser.getEventType() == XmlPullParser.START_TAG) {
            String tagName = parser.getName();
            if (tagName.equals("rotate")) {
                fromDegrees = Float.parseFloat(parser.getAttributeValue(null, "fromDegrees"));
                toDegrees = Float.parseFloat(parser.getAttributeValue(null, "toDegrees"));
                pivotX = Float.parseFloat(parser.getAttributeValue(null, "pivotX"));
                pivotY = Float.parseFloat(parser.getAttributeValue(null, "pivotY"));
                break;
            }
        }
        parser.next();
    }
} catch (Exception e) {
    e.printStackTrace();
}

// 将百分比值转换为像素值
float pivotXInPixels = pivotX * view.getWidth();
float pivotYInPixels = pivotY * view.getHeight();

// 创建RotateAnimation对象
RotateAnimation animation = new RotateAnimation(fromDegrees, toDegrees, pivotXInPixels, pivotYInPixels);