putObject method doesnt recognize Custom Object

[amruta-pani]

Using this method to save an object of a class wrapping a HashMap object is resulting in a LinkTreeMap Class casting error.
Eg Class:

public class Categories {
    private String categoryName;
    private ActivityMasterModel amm;

    @SerializedName("activities")
    @Expose
    private ArrayList<ActivityMasterModel> allActivities;

    private HashMap<String, ArrayList<ActivityMasterModel>> allActivitiesByCategory;

    public ArrayList<ActivityMasterModel> getAllActivities() {
        return allActivities;
    }

    public void setAllActivities(ArrayList<ActivityMasterModel> allActivities) {
        this.allActivities = allActivities;
    }

I couldnt save allActivitiesByCategory object into shared preferences using putObject method. Hence I created the above class to be used with putObject method. However, the object allActivitiesByCategory is saved using the below modified method.

public void putHashMapObject(String key, Object obj) {
       checkForNullKey(key);
       Type type = new TypeToken<Map<String, ArrayList<ActivityMasterModel>>>() {}.getType();
       Gson gson = new Gson();
       putString(key, gson.toJson(obj, type));
   }

I was following the below link and it helped a lot.
https://stackoverflow.com/questions/32444863/google-gson-linkedtreemap-class-cast-to-myclass

However, the same solution didnt work for SparseArray instead of HashMap. I couldnt solve the issue yet. I am not a Java guy, I should say a beginner, and trying to get my head around it.

[kcochibili]

I am happy you were able to find a hint online that enabled you to save the HashMap.

SparseArray is a little more complicated for Gson which TinyDB uses for saving Objects. To save a SparseArray, you'd have to create a custom put object method based on this example here.
https://stackoverflow.com/a/18644836/1463931

[amruta-pani]

Thank you for the link. Looks like the solution in the link too is not recommended but will have detailed look again. Thanks again

…

On Wed, Jun 7, 2017, 02:04 kcochibili ***@***.***> wrote: I am happy you were able to find a hint online that enabled you to save the HashMap. SparseArray is a little more complicated for Gson which TinyDB uses for saving Objects. To save a SparseArray, you'd have to create a custom put object method based on this example here. https://stackoverflow.com/a/18644836/1463931 — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#31 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ATmT6Sm_Kp3vRR7YQBOVHgJYbFk6P6y8ks5sBbfLgaJpZM4NwSCU> .