If you want to export an Ink annotation and then re-create it from path, you can use the following as a guide:

private ArrayList exportInk(Page.Annotation annotation) {
   if (annotation != null && annotation.GetType() == 15) {
      Path inkPath = annotation.GetInkPath();
      float pt1[] = new float[2];
      float pt2[] = new float[2];
      int index = 0;
      if (inkPath != null) {
         ArrayList inkPoints = new ArrayList();
         int cnt = inkPath.GetNodeCount();

         while (index < cnt) {
            int op = inkPath.GetNode(index, pt1);
            switch (op) {
               case 1: //line to
                  inkPoints.add(new Point(op, pt1[0], pt1[1]));
                  index++;
                  break;
               case 2: //curve to
                  inkPath.GetNode(index + 1, pt2);
                  float pt3[] = new float[2];
                  inkPath.GetNode(index + 2, pt3);
                  inkPoints.add(new Point(op, pt1[0], pt1[1], pt2[0], pt2[1], pt3[0], pt3[1]));
                  index += 3;
                  break;
               default: //move to
                  inkPoints.add(new Point(op, pt1[0], pt1[1]));
                  index++;
                  break;
            }
         }
         inkPath.Destroy();

         return inkPoints;
      }
   }
   return  null;
}

private void createInk(ArrayList inkPoints) {
   if(inkPoints != null) {
      Ink mInk = new Ink(Global.inkWidth / m_layout.vGetScale());

      for(int i = 0 ; i < inkPoints.size() ; i++) {
         Point point = inkPoints.get(i);
         switch(point.type) {
            case 1: //line to
               mInk.OnMove(point.x, point.y);
               break;
            case 0: //move to
               mInk.OnDown(point.x, point.y);
               break;
         }
      }

      Page page = m_doc.GetPage(m_pageno); //TODO set pageno according to requirements
      if (page != null) {
         page.ObjsStart();
         page.AddAnnotInk(mInk);
         page.Close();
      }
      mInk.Destroy();
      //m_layout.vRenderSync(m_layout.vGetPage(m_pageno));
   }
}

Point:

public class Point {

   private int type;

   private float x;
   private float x2;
   private float x3;

   private float y;
   private float y2;
   private float y3;

   public Point(int type, float x, float y) {
      this.type = type;
      this.x = x;
      this.y = y;
   }

   public Point(int type, float x, float y, float x2, float y2, float x3, float y3) {
      this.type = type;
      this.x = x;
      this.x2 = x2;
      this.x3 = x3;
      this.y = y;
      this.y2 = y2;
      this.y3 = y3;
   }

   public int getType() {
      return type;
   }

   public void setType(int type) {
      this.type = type;
   }

   public float getX() {
      return x;
   }

   public void setX(float x) {
      this.x = x;
   }

   public float getY() {
      return y;
   }

   public void setY(float y) {
      this.y = y;
   }
}