将参数化类型投入到GSON的类中

Question

我正在使用Android上的loopj获取HTTP响应。我想做的是通过自己的类型并返回该类型的响应。这是一个单一的国家模型

class Country:BaseModel() {
    @PrimaryKey
    @SerializedName("id")
    var id: Int=0
    @Column
    @SerializedName("name")
    var name: String? = null
    @Column
    @SerializedName("code")
    var code: String? = null
    @SerializedName("country_code")
    @Column
    var country_code: String? = null
}

我所做的类使使用gson序列化的json数组序列化的类别如下

public class LoopGsonResponseHandler<T> extends JsonHttpResponseHandler {
    public T Model;

    //Prototype to handle the Gson list of objects
    public void onSuccess(int statusCode, Header[] headers, T single){
    }
    //Prototype to handle the Gson list of objects
    public void onSuccess(int statusCode, Header[] headers, ArrayList<T> list){
    }
    @Override
    public void onSuccess(int statusCode, Header[] headers, JSONObject response) {
        super.onSuccess(statusCode, headers, response);
        //call on succecc with parameter 3 being model
        Type collectionType = new TypeToken<T>(){}.getType();
        T data = new Gson().fromJson(response.toString(), collectionType);
        this.onSuccess(statusCode,headers,data);
    }
    @Override
    public void onSuccess(int statusCode, Header[] headers, JSONArray response) {
        super.onSuccess(statusCode, headers, response);
        //call on succecc with parameter 3 being list
        Log.e("Country","We got array");
        Type collectionType = new TypeToken<ArrayList<T>>(){}.getType();
        ArrayList<T> data = new Gson().fromJson(response.toString(), collectionType);
        this.onSuccess(statusCode,headers,data);
    }
}

我成功地解析了对GSON对象的响应，但我无法将其解析为参数化类型。我得到的错误是这个

 java.lang.ClassCastException: com.google.gson.internal.LinkedTreeMap cannot be cast to com.neverest.client.models.MyJson
         at com.neverest.client.utils.LoopGsonResponseHandler.onSuccess(LoopGsonResponseHandler.java:34)
         at com.neverest.client.utils.LoopGsonResponseHandler.onSuccess(LoopGsonResponseHandler.java:55)
         at com.loopj.android.http.JsonHttpResponseHandler$1$1.run(JsonHttpResponseHandler.java:154)

Answer 1

使用像这样的构造函数

通过

public class LoopGsonResponseHandler<T> extends JsonHttpResponseHandler{
    public T model;
    private final Class<T> classOfT;
    public LoopGsonResponseHandler(Class<T> classOfT){
        this.classOfT = classOfT;
    }
    @Override
    public void onSuccess(int statusCode, Header[] headers, JSONObject response){
        super.onSuccess(statusCode, headers, response);
        T data = new Gson().fromJson(response.toString(), classOfT);
        this.onSuccess(statusCode, headers, data);
    }
    @Override
    public void onSuccess(int statusCode, Header[] headers, JSONArray response) {
        super.onSuccess(statusCode, headers, response);
        //call on succecc with parameter 3 being list
        Log.e("Country","We got array");
        Type collectionType = new ListParametrizedType(classOfT);
        ArrayList<T> data = new Gson().fromJson(response.toString(), collectionType);
        this.onSuccess(statusCode,headers,data);
    }
}

然后使LoopGsonResponseHandler对象这样。

新的loopgsonresponsehandler(country.class(;

对于ArrayList，您将需要此类

private static class ListParametrizedType implements ParameterizedType {
        private Type type;
        public ListParametrizedType(Type type) {
            this.type = type;
        }
        @Override
        public Type[] getActualTypeArguments() {
            return new Type[]{type};
        }
        @Override
        public Type getRawType() {
            return ArrayList.class;
        }
        @Override
        public Type getOwnerType() {
            return null;
        }
        @Override
        public boolean equals(Object obj) {
            return super.equals(obj);
        }
    }

你就完成了。：(