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?
最佳答案
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。
关于java - ActiveAndroid TypeSerializer - 枚举列表,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41543740/