Google GSON nested HashMaps deserialization

Question

In my current project i use GSON library in android, and i\'ve faced a problem of nested Maps deserializtion. This is how initial json looks like

 {

\"5\":         


        

Answer 1

This gson.fromJson(br, HashMap.class); tells to Gson that you want to deserialize to a Map of unknown value type. You would be tempted to specifiy something like Map.class, but you can not do this in Java so the solution is to use what they called TypeToken in Gson.

Map categoryMap = gson.fromJson(br, new TypeToken>(){}.getType());