public void getdatabase() {

    sqlite = new SQLiteCityManager(getActivity(), "weatherdb", null, 1);

    db = sqlite.getWritableDatabase();

    Cursor cursor = db.query("coolWeather", null, null, null, null, null, null);
    HomePageFragment.mcmb.clear();

    while (cursor.moveToNext()) {
      int _id = cursor.getInt(cursor.getColumnIndex("_id"));
      cityname = cursor.getString(cursor.getColumnIndex("cityname"));
      imageurl = cursor.getString(cursor.getColumnIndex("imageurl"));
      weather = cursor.getString(cursor.getColumnIndex("weather"));
      temp = cursor.getString(cursor.getColumnIndex("temp"));
      Log.i(
          "TAG",
          _id
              + "  @@@@@@@@_id-"
              + " cityname-"
              + cityname
              + " imageurl-"
              + imageurl
              + " weather-"
              + weather
              + " temp-"
              + temp);
      setCityManagerEntity();
    }
  }
 /** 删除数据库 */
 public void deletedata() {
   sqlite = new SQLiteCityManager(getActivity(), "weatherdb", null, 1);
   db = sqlite.getWritableDatabase();
   db.delete("coolWeather", "_id = " + 2, null);
 }