DBHelper
DBHelper(Context context){ }
<div>@Override</div><div> public void onCreate(SQLiteDatabase db){ }</div>
<div>@Override</div><div> public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){ }</div>
DBManager
void insertNews(NewsInfo newsInfo){ }
List<NewsInfo> queryNews(){ }
long getCount(){ }
