Activity 之间 传递 List 封装的对象或者对象

      项目中遇到 从也个页面向还有一个页面跳转传递一个List 封装的对象 。按网上查的资料 须要把 对象 实现 Serializable接口。
写了一下。可是跳转直接崩溃。一直看错误之日找不到原因后来自习教案代码，发现bean里面还有其它bean。对象里的对象没有 进行序列化。记录分享一下。

代码例如以下：

两个Bean 文件

import java.io.Serializable;
import java.util.List;

/**

 * ${JHS}
 */

public class KnowledgeClassifyChildBean implements Serializable {

        /**
         * 知识点ID  *
         */
        public String knowledgeId;
        /**
         * 知识点名称
         */
        public String knowledgeName;
        /**
         * 知识点题数
         */
        public int Sum;
        public boolean isSelect = false;

}

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

/**

 * ${JHS}
 */

public class KnowledgeClassifyBean implements Serializable {

    /*
                {
                    "knowledgeId": 387,//知识点ID
                    "knowledgeName": "认识立体几何图形",//知识点名称
                    "Sum":15 //知识点题数
        */
    private static final long serialVersionUID = 1L;

    /**
     * 章节ID  *
     */
    public String chapterId;
    /**
     * 章节名称
     */
    public String chapterName;
    public boolean isSelect = false;
   <span style="background-color: rgb(255, 0, 0);"> public List<KnowledgeClassifyChildBean> knowledgeList = new ArrayList<KnowledgeClassifyChildBean>();</span>

}

Activity 之间传 List<KnowledgeClassifyBean >

 

KnowledgeClassifyBean mKnowledgeClassifyBean ;

 List<KnowledgeClassifyBean>   knowledgeClassifyBeanList = new ArrayList<KnowledgeClassifyBean>();

 for (int i = 0; i < 6; i++) {
      mKnowledgeClassifyBean      = new KnowledgeClassifyBean();
            mKnowledgeClassifyBean.chapterName = "章节名称  " + i + i;
            for (int j = 0; j < 6; j++) {
                KnowledgeClassifyChildBean mKnowledgeList = new KnowledgeClassifyChildBean();
                mKnowledgeList.knowledgeName = " 名称  " + j;
                mKnowledgeClassifyBean.knowledgeList.add(mKnowledgeList);
            }
            knowledgeClassifyBeanList.add(mKnowledgeClassifyBean);
        }

 Intent intent = new Intent(A.this, B.class);
                if (knowledgeClassifyBeanList != null) {
                    intent.putExtra("knowledgeClassifyBeanList", (Serializable) knowledgeClassifyBeanList);
                    startActivity(intent);
                }

B这边 Activity  接收

  Intent intent = getIntent();
        List<KnowledgeClassifyBean> knowledgeClassifyBeanList  = (  List<KnowledgeClassifyBean>) intent.getSerializableExtra("knowledgeClassifyBeanList");
        Log.i("-----knowledge--" ,knowledgeClassifyBeanList.size() + "");

 Activity 之间传递对象也是实现  Serializable 接口

KnowledgeClassifyBean   knowledgeClassifyBean = new KnowledgeClassifyBean();

intent.putExtra("knowledgeClassifyBean ", knowledgeClassifyBean );  

接收的Activity

 Intent intent = getIntent();  
KnowledgeClassifyBean   knowledgeClassifyBean  = 

（KnowledgeClassifyBean )intent.getSerializableExtra("knowledgeClassifyBean ");