Android: How to use greenDao for async loading data?

Question

I would like use greenDao with a loader <cursor> to load asynchronously my data from the DB. I found example using loader with a contentProvider. I know that loaders are the best way to load data from a database because it handle the lifecycle of the cursor, auto update the cursor when we add a value.. Unfortunately there is no example of loader with greenDao, is it possible or I have to use a contentProvider??

Thx

Answer 1

I came across this question since i was also have the same question, but I have an idea but have never tried it yet but you can maybe execute it faster and better than me. I think eventbus(https://github.com/greenrobot/EventBus) can be a solution, whenever there is a change in the local database (add,delete,update) you can notify an event, and in your activity you should have an event listener that will trigger content reload(re-query again) upon receiving the event.

Answer 2

GreenDao allows you to run queries and return strongly typed objects, so a loader isn't needed, you can simply wrap it in an ASyncTask. e.g.:

    DaoSession session = DbHelper.getInstance().getDaoSession();
    final SpeakerDao speaker = session.getSpeakerDao();

    new AsyncTask<Void, Void, Speaker>() {

        @Override
        protected Speaker doInBackground(Void... params) {
            return speaker.queryBuilder().list().get(0);
        }

        @Override
        protected void onPostExecute(Speaker result) {
            // do stuff with speaker
        }

    }.execute();