package SubredditDatabase; import android.arch.persistence.room.Database; import android.arch.persistence.room.Room; import android.arch.persistence.room.RoomDatabase; import android.content.Context; @Database(entities = {SubredditData.class}, version = 1) public abstract class SubredditRoomDatabase extends RoomDatabase{ private static SubredditRoomDatabase INSTANCE; public abstract SubredditDao subredditDao(); public static SubredditRoomDatabase getDatabase(final Context context) { if(INSTANCE == null) { synchronized (SubredditRoomDatabase.class) { if(INSTANCE == null) { INSTANCE = Room.databaseBuilder(context.getApplicationContext(), SubredditRoomDatabase.class, "subreddits") .build(); } } } return INSTANCE; } }