Android: What is the easiest way to synchronize a remote database in the background?

Question

I have an Android database hosted in Parse and I am trying to find the best way / methods to update my LocalStorage with the latest deleted changes.

I am not asking for code or syntax, I just wanted to follow a series of steps to follow, I’m sure I will need to use a workflow because I don’t want to block the user interface, I would like the transition to be as smooth as possible for the user ( he didn’t even realize that an update was happening), and I want this to happen when the application is in the foreground. Ideas I have received so far:

• Use multithreading (Loopers, Handlers, Thread) and update each table in a separate thread.
• Try to suppress the query to minimize CPU usage and get the table at a time.
• Use the bootloader and just listen to the changes.
• Call IntentService to get table by table.
• Create an Unbound Service and update the database after closing the application.
• Do not update the database in the background and wait for the user to really require the data and retrieve it.

I already tried IntentService, it is not as smooth as we would like:

public class DataService extends IntentService {
    public DataService() {
        super(DataService.class.getName());
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        String[] entities = {
                "Img",
                "Pack",
                "Technology",
                "Term",
                "TermHierarchy",
                "TermImplementation",
                "TermTerm",
                "UserTechnology",
                "UserTerm",
        };

        for (String entity : entities) {
            updateLocalTable(entity);
        }
    }

    private void updateLocalTable(String entity) {
        ParseQuery<ParseObject> query = new ParseQuery<ParseObject>(entity);
        query.findInBackground(new FindCallback<ParseObject>() {
            @Override
            public void done(List<ParseObject> objects, ParseException e) {
                if (e == null){
                    ParseObject.pinAllInBackground(objects);
                }else {
                    Log.e(TAG_, e.toString());
                }
            }
        });
    }
}

In addition, I call it the first time I change the connection (Wi-Fi is available). Should I instead just call it onCreate or create an alarm to update once at a certain specific time or only after the Activity is completed?

I saw several related posts:

Update data in the background Periodically (Android)

Android SQL-, -

(mysql) sqlite

, .

, Parse RESTful JSON, .

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Edit.

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