我试图从 ContactsContract 获取电子邮件地址，但我只得到一个空字符串!姓名和电话号码可以正常使用，但电子邮件地址不行!

我很困惑，几天来一直在尝试解决这个问题，但我不知道出了什么问题，如果我遗漏了代码中的某些内容或什么，我也不知道如何解决这个问题。

应用程序的这一部分有一个包含 ContactsContract 中所有名称的 ListView。在 ListView 中选择姓名时，代码应从 ContactsContract 中获取姓名、电话号码和电子邮件地址。

如果能继续工作，我将不胜感激!也许有更好的方法可以解决这个问题，那么请告诉我如何改变!谢谢!

由于 toast 消息没有出现在 while 循环中，while(cursorEmail.moveToFirst()){.... 我猜电子邮件光标有问题!？好像是空的!？

public class Activity_3 extends Activity {

ListView listView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_3);
    listView = (ListView) findViewById(R.id.contactList);

    String[] projection = { ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME, 
            ContactsContract.CommonDataKinds.Phone.NUMBER,
            ContactsContract.CommonDataKinds.Phone._ID };

    Cursor cursor1 = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, projection, null, null, null);

    // From column
    String[] fromColumn = { ContactsContract.Contacts.DISPLAY_NAME };
    // To view
    int[] toView = { R.id.contactItem };

    startManagingCursor(cursor1);

    ListAdapter adapter = new SimpleCursorAdapter(this, R.layout.activity_3, cursor1, fromColumn, toView);

    listView.setAdapter(adapter);

    listView.setOnItemClickListener(new OnItemClickListener() {

        public void onItemClick(AdapterView<?> adapter, View view, int position, long id) {

            String[] projection = { ContactsContract.CommonDataKinds.Phone._ID, 
                    ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME, 
                    ContactsContract.CommonDataKinds.Phone.NUMBER,
                    };

            Cursor cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, projection, null, null, null);

            cursor.moveToPosition(position);

            String contactId = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
            String contactName = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
            String contactNumber = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));

            String pos = Integer.toString(position);

            String contactEmailAddress = "?";   
            //Email
            Cursor emails = getContentResolver().query(ContactsContract.CommonDataKinds.Email.CONTENT_URI, null, ContactsContract.CommonDataKinds.Email.CONTACT_ID + "=" + contactId, null,  null);

            while(emails.moveToNext()){
                contactEmailAddress = emails.getString(emails.getColumnIndex(ContactsContract.CommonDataKinds.Email.DATA));
                Toast.makeText(Activity_3.this, contactEmailAddress, Toast.LENGTH_SHORT).show();
            }
            emails.close();

            Toast.makeText(Activity_3.this, pos + " " + contactId + " " + contactName + " " + contactNumber + " " + contactEmailAddress, Toast.LENGTH_SHORT).show();
        }
    });
}

最佳答案

您需要使用以下代码获取包含详细信息的联系人列表。以下方法将返回所有联系人的姓名、电话号码和电子邮件。

public ArrayList<ContactDO> getContacts()
{
    ArrayList<ContactDO> alContacts = null;
    Cursor cursor = contResv.query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null);
    if(cursor.moveToFirst())
    {
        alContacts = new ArrayList<ContactDO>();
        do
        {
            //Create a plain class with following variables - id, name, contactNumber, email
            ContactDO objContactDO = new ContactDO();

            objContactDO.name = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));       
            objContactDO.id = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));

            Cursor emails = contResv.query(Email.CONTENT_URI,null,Email.CONTACT_ID + " = " + objContactDO.id, null, null);
            while (emails.moveToNext()) 
            { 
                objContactDO.email = emails.getString(emails.getColumnIndex(Email.DATA));
                break;
            }
            emails.close();

            if(Integer.parseInt(cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0)
            {
                Cursor pCur = contResv.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,null,ContactsContract.CommonDataKinds.Phone.CONTACT_ID +" = ?",new String[]{ objContactDO.id }, null);
                while (pCur.moveToNext()) 
                {
                    objContactDO.contactNumber = pCur.getString(pCur.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                    break;
                }
                pCur.close();
            }

            alContacts.add(objContactDO);

        } while (cursor.moveToNext()) ;
    } 

    cursor.close(); 
    return alContacts;
}

创建自定义适配器并将其设置为 ListView 。

lvContacts.setAdapter(adapter = new CustomContactsAdapter(getContacts()));

关于android - 无法从 ContactsContract 获取电子邮件地址，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/15243205/