數據庫的工具類

public class SubApplication extends Application {

    private DaoSession daoSession;
    private static SubApplication subApplication;

    @Override
    public void onCreate() {

        getDatabase();

        subApplication = this;

        super.onCreate();

    }
    public static SubApplication getInstance(){
        return subApplication;
    }

    private void getDatabase() {
        DaoMaster.DevOpenHelper openHelper = new DaoMaster.DevOpenHelper(this, "zuoye");
        SQLiteDatabase database = openHelper.getWritableDatabase();
        DaoMaster daoMaster = new DaoMaster(database);
        daoSession = daoMaster.newSession();
    }
    public DaoSession getDaoSession(){
        return daoSession;
    }
}