java - ActiveAndroid TypeSerializer - 枚举列表

Question

在我的应用程序中，我使用 ActiveAndoid .
在某些模型中，我有一列 List<String>和其他List<MyEnum> .
我创建了一个 TypeSerializer对于每种类型:

public class StringsListTypeSerializer extends TypeSerializer
{
    private static GsonBuilder sGsonBuilder;

    static{
        sGsonBuilder = new GsonBuilder();
    }

    @Override
    public Class<?> getDeserializedType() {
        return List.class;
    }

    @Override
    public Class<?> getSerializedType() {
        return String.class;
    }

    @Override
    public String serialize(Object data) {
        if(data == null){
            return null;
        }

        final Gson gson = sGsonBuilder.create();
        return gson.toJson(data);
    }

    @Override
    public List<String> deserialize(Object data) {
        if(data == null){
            return null;
        }

        final Gson gson = sGsonBuilder.create();
        List<String> strings = gson.fromJson(data.toString(), List.class);

        return strings;
    }
}

和MyEnum (这是一个 enum 类型):

public class MyEnumListTypeSerializer extends TypeSerializer {

    private static GsonBuilder sGsonBuilder;

    static{
        sGsonBuilder = new GsonBuilder();
        sGsonBuilder.registerTypeAdapter(MyEnum.class, new MyEnumJsonDeserializer());
    }

    @Override
    public Class<?> getDeserializedType() {
        return new TypeToken<ArrayList<MyEnum>>(){}.getType().getClass();
    }

    @Override
    public Class<?> getSerializedType() {
        return String.class;
    }

    @Override
    public String serialize(Object data) {
        if(data == null){
            return null;
        }

        final Gson gson = sGsonBuilder.create();

        return gson.toJson(data);
    }

    @Override
    public ArrayList<MyEnum> deserialize(Object data) {
        if(data == null){
            return null;
        }

        final Gson gson = sGsonBuilder.create();
        Type listType = new TypeToken<ArrayList<MyEnum>>(){}.getType();
        ArrayList<MyEnum> myList = gson.fromJson(data.toString(), listType);

        return myList;
    }
}

我的问题是 ActiveAndroid序列化 MyEnum列表类型作为字符串列表(使用 StringsListTypeSerializer )和运行时当我使用 List<MyEnum> 时在每个循环中我得到 ClassCastException - 无法转换 String至 Enum .
如何解决这个问题？

Answer 1

我用来找出不同类型的方法

public abstract class BaseGsonSerializer extends TypeSerializer {

    private Gson gson;

    public BaseGsonSerializer() {
        this.gson = new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create();
    }

    @DebugLog
    @Override
    public Class<?> getSerializedType() {
        return String.class;
    }

    @Override
    @DebugLog
    public Class<?> getDeserializedType() {
        return TypeToken.get(getTypeDeserialize()).getRawType();
    }

    @Override
    public Object serialize(Object data) {
        if (data != null) {
            return gson.toJson(data);
        }
        return null;
    }

    @Override
    public Object deserialize(Object data) {
        if (data != null) {
            return gson.fromJson(data.toString(), getTypeDeserialize());
        }
        return null;
    }

    protected abstract Type getTypeDeserialize();

}

以下类使用 BaseGsonSerializer

public class PriceSerializer extends BaseGsonSerializer {

    protected Type getTypeDeserialize() {
        return new TypeToken<Price>() {
        }.getType();
    }
}

public class PriceListSerializer extends BaseGsonSerializer {

    protected Type getTypeDeserialize() {
        return new TypeToken<List<Price>>() {
        }.getType();
    }
}

这正是我想要的，即转换为 json 字符串的价格列表和转换为 json 字符串的价格对象

希望这可以帮助您解决问题。