Try this. It works with me. Hope you too!
List<YOUR_OBJECT> testList = new ArrayList<>();_x000D_
testList.add(test1);_x000D_
_x000D_
Gson gson = new Gson();_x000D_
_x000D_
String json = gson.toJson(testList);_x000D_
_x000D_
Type type = new TypeToken<ArrayList<YOUR_OBJECT>>(){}.getType();_x000D_
_x000D_
ArrayList<YOUR_OBJECT> array = gson.fromJson(json, type);
_x000D_