Android通过Parcelable传递复杂的对象数据和简单的对象数据

二次验证:绝对有效

转：https://blog.youkuaiyun.com/u014614038/article/details/56279075

Android推荐可以通过Parcelable来传递自定义的数据()，比如以下的数据体：

public class GradeInfoForSearch {
    public String ID;
    public String Name;
    }

只要通过实现了Parcelable接口就可以了，代码如下：

public class GradeInfoForSearch implements Parcelable {
    public String ID;
    public String Name;

    public GradeInfoForSearch() {

    }

    public GradeInfoForSearch(Parcel source) {
        ID = source.readString();
        Name = source.readString();

    }

    @Override
    public int describeContents() {

        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {

        dest.writeString(ID);
        dest.writeString(Name);

    }

    public final static Parcelable.Creator<GradeInfoForSearch> CREATOR = new Parcelable.Creator<GradeInfoForSearch>() {

        @Override
        public GradeInfoForSearch createFromParcel(Parcel source) {

            return new GradeInfoForSearch(source);
        }

        @Override
        public GradeInfoForSearch[] newArray(int size) {

            return new GradeInfoForSearch[size];
        }
    };

    @Override
    public String toString() {
        return "GradeInfoForSearch [ID=" + ID + ", Name=" + Name + "]";
    }

}

复杂的数据体（对象中嵌套对象或者数组的形式）：

public class ResourceBean{

    //对象
    ResourceClasslevelOne  one;
    //数组
    public List<ResourceClasslevelOne> resourceClasslevelOne;
    public List<CategoryInfoForSearch> categorylist;
    public List<SubjectNameForIndex> subjectList;
    public List<GradeInfoForSearch> gradeList;
    public List<ResourceClassLevelTwoForSearch>                      resourceClassForlevelTwo;
    }

正确的做法是：

1.ResourceBean实现了Parcelable。 
2.成员变量的所有自定义数据体都实现Parcelable。

writeToParce方法如下： 写的方法

@Override
    public void writeToParcel(Parcel dest, int flags) {

       // 单一对象
       if (one != null) {
            parcel.writeParcelable(resourceClasslevelOne, i);
        }
       //数组
         if (resourceClasslevelOne != null)
            dest.writeParcelableArray(
                    resourceClasslevelOne.toArray(new ResourceClasslevelOne[resourceClasslevelOne.size()]), flags);
        ....

    }

ResourceBean(Parcel source)如下：  读的方法

public ResourceBean(Parcel source) {
     //单一对象的读
        one = in.readParcelable(resourceClasslevelOne.class.getClassLoader());
       //数组

        Parcelable[] resourceClasslevelOneps = source.readParcelableArray(ResourceClasslevelOne.class.getClassLoader());

        if (resourceClasslevelOneps != null) {
            resourceClasslevelOne = Arrays.asList(Arrays.asList(resourceClasslevelOneps)
                    .toArray(new ResourceClasslevelOne[resourceClasslevelOneps.length]));

        }

        ....
        }

    }