How to serialize and de-serialize an unknown class with GSON.

JsonWrapper.java

package com.example;

@JsonAdapter(JsonWrapperAdapter.class)
public class JsonWrapper {
    private static final String classNameKey = "className";
    private static final String wrappedObjectKey = "wrappedObject";

    private final String className;
    private final Object wrappedObject;

    private JsonWrapper(Object object) {
        wrappedObject = object;
        className = object.getClass().getName();
    }
}

JsonWrapperAdapter.java

package com.example;

public class JsonWrapperAdapter extends TypeAdapter<JsonWrapper> {
    private static final String TAG = JsonWrapperAdapter.class.getSimpleName();

    @Override
    public void write(JsonWriter out, JsonWrapper wrapper) throws IOException {
        out.beginObject();

        out.name(JsonWrapper.classNameKey);
        out.value(wrapper.className);

        out.name(JsonWrapper.wrappedObjectKey);
        out.value(IntentHelper.getGson().toJson(wrapper.wrappedObject, wrapper.wrappedObject.getClass()));

        out.endObject();
    }

    @Override
    public JsonWrapper read(JsonReader in) throws IOException {
        String className = null;
        String classObjectString = null;

        in.beginObject();
        while (in.hasNext()) {
            String next = in.nextName();
            if (JsonWrapper.classNameKey.equals(next)) {
                className = in.nextString();
            } else if (JsonWrapper.wrappedObjectKey.equals(next)) {
                classObjectString = in.nextString();
            }
        }
        in.endObject();

        if (TextUtils.isEmpty(className) || TextUtils.isEmpty(classObjectString)) return null;

        try {
            Class<?> clazz = Class.forName(className);
            Object object = IntentHelper.getGson().fromJson(classObjectString, clazz);
            return new JsonWrapper(object);
        } catch (ClassNotFoundException | ClassCastException | JsonParseException e) {
            Log.e(TAG, "Exception when trying to deserialize your JsonWrapper.", e);
            return null;
        }
    }
}

The only bad part about this is you have to know the class to deserialize this. This won't work with server stuff.