android中如何在sqlite中保存双数据类型值

我面临有关sqlite数据库的问题。我想在数据库中保存数据。KEY_LATITUDE和KEY_LONGITUDE分别从info.getlation和info.getLongitude获取空值。但是info.getLength和info.getLatitude分别为12.99999和50.9999

private static final String KEY_ID = "id";
private static final String KEY_EventName = "event_name";
private static final String KEY_Description = "description";
private static final String KEY_Location = "location";
private static final String KEY_Date = "date";
private static final String KEY_Time = "time";
private static  String KEY_LATITUDE ;
private static  String KEY_LONGITUDE ;

addinfo函数将数据保存到数据库中

    public void addInfo(Event info) {
    SQLiteDatabase db = this.getWritableDatabase();

    ContentValues values = new ContentValues();
    values.put(KEY_EventName, info.getEventName());
    values.put(KEY_Location, info.getLocationName());

    values.put(KEY_Description, info.getDescription());
    values.put(KEY_Date, info.getDate());
    values.put(KEY_Time, info.getTime());

    values.put(KEY_LATITUDE, info.getLatitude()); // it return Double
                                                    // value.i.e 12.999999
    values.put(KEY_LONGITUDE, info.getLongitude()); // it return Double
                                                    // value.i.e 12.999999

    db.insert(TABLE_EVENT_DATA, null, values);
    db.close(); // Closing database connection
}

将双精度值转换为字符串

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您需要初始化列名变量：

private static  String KEY_LATITUDE ;
private static  String KEY_LONGITUDE ;

改为

private static final String KEY_LATITUDE = "latitude";
private static final String KEY_LONGITUDE = "longitude";

private static final String KEY_LATITUDE = "latitude";
private static final String KEY_LONGITUDE = "longitude";