Question

How do I handle references between Fragments showing list of data and different threads/classes updating data in the background. Because of this I need to be able to force update from outside of the Fragments via Observer-inf or something similar.

Currently I’m using dummy factory-class to create a new SqlLiteDatabase object, based on my default settings for it.

public static SQLiteDatabase initFor(Context context) {
    db = context.openOrCreateDatabase(NAME, SQLiteDatabase.CREATE_IF_NECESSARY, null);
    db.setLocale(Locale.getDefault());
    db.setVersion(1);
    db.setLockingEnabled(true);
    return db; }

Then I call this from each fragment and sets up adapters, the same applies to the data-inserter-threads. To close the db, I override my activity’s onDestroy() and call: initFor(this).close(); .

This is very ugly and it fails on orientation change. I’m thinking of SQLiteOpenHelper but I don’t know how it will help me.

Answer 1

You should access your database on another thread (in a Service) then have this talk to one class (which could be your helper), you then access this helper class through a singleton initialized in a class that extends Application. You can get your Application class from any of your fragments by calling

 ((YourApplication) context.getApplicationContext()).getGetDatabaseHelper();