如何从联系人获取电子邮件和从联系人获取电话号码，并且类没有扩展活动和 oncreate() 方法？

Question

我收到电话号码、来自联系人的邮件，但没有扩展活动和 oncreate 方法。

通过使用以下代码：

 \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
          Class A extends Activity{

  new ClassB(this);
 }

 ////////////////////////////////////////////////////
 public static void getContactNumbers(Context context) {
    String contactNumber = null;
    int contactNumberType = Phone.TYPE_MOBILE;
    String nameOfContact = null;

        ContentResolver cr = context.getContentResolver();
        Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI, null,
                null, null, null);
        if (cur.getCount() > 0) {
            while (cur.moveToNext()) {
                String id = cur.getString(cur
                        .getColumnIndex(BaseColumns._ID));
                nameOfContact = cur
                        .getString(cur
                                .getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));

                if (Integer
                        .parseInt(cur.getString(cur
                                .getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0) {
                    Cursor phones = cr
                            .query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
                                    null,
                                    ContactsContract.CommonDataKinds.Phone.CONTACT_ID
                                            + " = ?", new String[] { id },
                                    null);

                    while (phones.moveToNext()) {
                        contactNumber = phones.getString(phones
                                .getColumnIndex(Phone.NUMBER));
                        contactNumberType = phones.getInt(phones
                                .getColumnIndex(Phone.TYPE));
                        Log.i(TAG, "...Contact Name ...." + nameOfContact
                                + "...contact Number..." + contactNumber);
                        ApplicationConstants.phoneContacts
                                .add(new ContactNumberBean(nameOfContact,
                                        contactNumber, contactNumberType));
                    }
                    phones.close();
                }

            }
        }// end of contact name cursor
        cur.close();

}

/**
 * 
 * This method is responsible to get native contacts and corresponding email
 * id (ApplicationConstants.emailContacts)
 * 
 * @param context
 */
public static void getContactEmails(Context context) {
    String emailIdOfContact = null;
    int emailType = Email.TYPE_WORK;
    String contactName = null;


        ContentResolver cr = context.getContentResolver();
        Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI, null,
                null, null, null);
        if (cur.getCount() > 0) {
            while (cur.moveToNext()) {
                String id = cur.getString(cur
                        .getColumnIndex(BaseColumns._ID));
                contactName = cur
                        .getString(cur
                                .getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
                // Log.i(TAG,"....contact name....." +
                // contactName);

                cr.query(
                        ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
                        null,
                        ContactsContract.CommonDataKinds.Phone.CONTACT_ID
                                + " = ?", new String[] { id }, null);

                Cursor emails = cr.query(Email.CONTENT_URI, null,
                        Email.CONTACT_ID + " = " + id, null, null);
                while (emails.moveToNext()) {
                    emailIdOfContact = emails.getString(emails
                            .getColumnIndex(Email.DATA));
                    // Log.i(TAG,"...COntact Name ...."
                    // + contactName + "...contact Number..."
                    // + emailIdOfContact);
                    emailType = emails.getInt(emails
                            .getColumnIndex(Phone.TYPE));
                    ApplicationConstants.emailContacts
                            .add(new ContactEmailBean(contactName,
                                    emailIdOfContact, emailType));

                }
                emails.close();

            }
        }// end of contact name cursor
        cur.close();


} 

/////////////////////////////////////////

从获得结果来看它工作正常，但我不知道如何实现上面示例中的以下代码：

ApplicationConstants.phoneContacts
.add(new ContactNumberBean(nameOfContact,
contactNumber, contactNumberType));

如果有人知道这一点，请帮助我。

Answer 1

您只需要访问 android.content.Context 对象即可访问 ContentResolver，从而查询 ContentProviders。 Activity 扩展了 Context，因此可以工作。 android.app.Service 还扩展了 Activity，因此也可以工作。 android.app.Application 还扩展了 Context，所以这也可以工作。