如何将安卓联系人出生日期字符串转换为日期格式

Question

在我的Android项目中，我想将联系人出生日期转换为字符串，从用户区域设置到日期。

  String whereBday = ContactsContract.Data.MIMETYPE + "= ? AND " +
            ContactsContract.CommonDataKinds.Event.TYPE + "=" + 
            ContactsContract.CommonDataKinds.Event.TYPE_BIRTHDAY;
     String[] paramsBday = new String[]{ 
            ContactsContract.CommonDataKinds.Event.CONTENT_ITEM_TYPE   };
    Cursor bDayCursor = contentResolver.query(ContactsContract.Data.CONTENT_URI,
                    null,  whereBday, paramsBday, null); 
    while (bDayCursor.moveToNext()) { 
//date of birth as String format
        String bDay = bDayCursor.getString(bDayCursor.getColumnIndex(ContactsContract.CommonDataKinds.Event.START_DATE));
       //converting string to date format
       SimpleDateFormat formatter = new SimpleDateFormat(bDay);
        Date myDate= formatter.parse(mytime);
        DateFormat f = DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.SHORT, Locale.getDefault());
        String formattedDate = f.format(new Date());
        System.out.println("Date: " + formattedDate);
    }
     bDayCursor.close();

Answer 1

不幸的是，对于日期格式的存储方式似乎没有固定的标准。最好的解决方案是遍历日期格式列表，并查看它是否与以下任何一项匹配。获得date对象后，您可以使用自己的格式化程序将其修改为以任何格式打印。此外，如果未找到，则可以检查不支持的格式，并将其添加到数组中。

您可以使用以下代码：

public static final SimpleDateFormat[] birthdayFormats = {
        new SimpleDateFormat("yyyy-MM-dd"),
        new SimpleDateFormat("yyyy.MM.dd"),
        new SimpleDateFormat("yy-MM-dd"),
        new SimpleDateFormat("yy.MM.dd"),
        new SimpleDateFormat("yy/MM/dd"),
        new SimpleDateFormat("MMM dd, yyyy")
};
private void printBirthdays() {
    Cursor cursor = getContactsBirthdays();
    int bDayColumn = cursor.getColumnIndex(ContactsContract.CommonDataKinds.Event.START_DATE);
    while (cursor.moveToNext()) {
        String bDay = cursor.getString(bDayColumn);
        Date birthday = null;
        boolean found = false;
        for (SimpleDateFormat f : birthdayFormats) {
            try {
                birthday = f.parse(bDay);
                Log.e(TAG, bDay + " = " + birthday.toString());
                found = true;
                break;
            } catch (ParseException e) {
            }
        }
        if (!found) {
            Log.e(TAG, bDay);
        }
    }
}
private Cursor getContactsBirthdays() {
    Uri uri = ContactsContract.Data.CONTENT_URI;
    String[] projection = new String[]{
            ContactsContract.Contacts.DISPLAY_NAME,
            ContactsContract.CommonDataKinds.Event.CONTACT_ID,
            ContactsContract.CommonDataKinds.Event.START_DATE
    };
    String where =
            ContactsContract.Data.MIMETYPE + "= ? AND " +
                    ContactsContract.CommonDataKinds.Event.TYPE + "=" +
                    ContactsContract.CommonDataKinds.Event.TYPE_BIRTHDAY;
    String[] selectionArgs = new String[]{
            ContactsContract.CommonDataKinds.Event.CONTENT_ITEM_TYPE
    };
    String sortOrder = null;
    return managedQuery(uri, projection, where, selectionArgs, sortOrder);
}