How do you save/store objects in SharedPreferences on Android?

Question

I need to get user objects in many places, which contain many fields. After login, I want to save/store these user objects. How can we implement this kind of scenario?

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Answer 1

My utils class for save list to SharedPreferences

public class SharedPrefApi {
    private SharedPreferences sharedPreferences;
    private Gson gson;

    public SharedPrefApi(Context context, Gson gson) {
        this.sharedPreferences = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
        this.gson = gson;
    } 

    ...

    public  void putObject(String key, T value) {
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putString(key, gson.toJson(value));
        editor.apply();
    }

    public  T getObject(String key, Class clazz) {
        return gson.fromJson(getString(key, null), clazz);
    }
}

Using

// for save
sharedPrefApi.putList(SharedPrefApi.Key.USER_LIST, userList);

// for retrieve
List userList = sharedPrefApi.getList(SharedPrefApi.Key.USER_LIST, User.class);

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Full code of my utils // check using example in Activity code