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Java.lang.ClassCastException: com.google.gson.internal.LinkedTreeMap cannot be cast to …..
我需要把一串json转化成Java List 最初是这样写的:
private List<CourseDetailsBean.MsgBean.VideoListBean> mList = new ArrayList<CourseDetailsBean.MsgBean.VideoListBean>();
Gson gson=new Gson();
mList= gson.fromJson(str,ArrayList.class);
当调用的时候:
final CourseDetailsBean.MsgBean.VideoListBean bean = mList.get(postion);
就会报以下错误:
java.lang.ClassCastException: com.google.gson.internal.LinkedTreeMap cannot be cast to …..
解决办法:
mList= gson.fromJson(str,new TypeToken<List<CourseDetailsBean.MsgBean.VideoListBean>>(){}.getType());
造成这种问题的原因是
泛型在编译期类型被擦除导致的
public static <T> List<T> fromJsonArray(String json, Class<T> clazz) throws Exception {
List<T> lst = new ArrayList<T>();
JsonArray array = new JsonParser().parse(json).getAsJsonArray();
for(final JsonElement elem : array){
lst.add(new Gson().fromJson(elem, clazz));
}
return lst;
}