以下的代码有两处明显的错误，一不小心就会写出如下错误的代码，其中第2个问题调试起来很麻烦：

1 public class AddedBannerInfo implements Parcelable { 2  3     private List
     
       mBannerInfoList; 4      5     @Override 6     public int describeContents() { 7         return 0; 8     } 9 10     @Override11     public void writeToParcel(Parcel dest, int flags) {12         dest.writeList(mBannerInfoList);13     }14     15     public static final Parcelable.Creator
      
        16         CREATOR = new Parcelable.Creator
       
        () {17 18             @Override19             public AddedBannerInfo createFromParcel(Parcel source) {20                 AddedBannerInfo addedInfo = new AddedBannerInfo();21                 22                 source.readList(addedInfo.mBannerInfoList, 23                         BannerInfo.class.getClassLoader());24                 return null;25             }26 27             @Override28             public AddedBannerInfo[] newArray(int size) {29                 return new GameCenterAddedBannerInfo[size];30             }31     };32 }
       
      
     

A.第22行，addedInfo.mBannerInfoList为空不能直接将其作为参数，传给source.readList,而应该在之前先构造下：

addedInfo.mBannerInfoList = new ArrayList
     
      ();
     

B.第24行，返回的竟然一直是null,这个很有可能是stub代码，应修改为:

return addedInfo;