Database.java

import android.arch.persistence.room.Database;
import android.arch.persistence.room.Room;
import android.arch.persistence.room.RoomDatabase;
import android.content.Context;

@Database(entities = {Uye.class}, version = 1)
public abstract class RepoDatabase extends RoomDatabase {
    private static final String DB_NAME = "veri.db";
    private static volatile  RepoDatabase instance;

    static synchronized RepoDatabase getInstance(Context context){
        if(instance == null){
            instance = create(context);
        }
        return instance;
    }

    private static RepoDatabase create(final Context context){
        return Room.databaseBuilder(
                context,
                RepoDatabase.class,
                DB_NAME).build();
    }

    public abstract UyeDao getUyeDao();
}