从联系人列表中获取姓名和电子邮件非常慢 [英] Getting name and email from contact list is very slow
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问题描述
我正在实施 AutoCompleteTextView,我需要所有联系人的姓名和电子邮件.我发现这个代码片段是异步运行的,但速度很慢.
I'm implementing an AutoCompleteTextView and I need Name and E-Mail of all my contacts. I found this snippet that I'm running asynchronously but it's very slow.
ContentResolver cr = 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(ContactsContract.Contacts._ID));
String name = cur.getString(cur.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
Cursor emailCur = cr.query(ContactsContract.CommonDataKinds.Email.CONTENT_URI, null, ContactsContract.CommonDataKinds.Email.CONTACT_ID + " = ?", new String[]{id}, null);
while (emailCur.moveToNext()) {
String email = emailCur.getString(emailCur.getColumnIndex(ContactsContract.CommonDataKinds.Email.DATA));
autoCompleteAdapter.add(name + " - " + email);
}
emailCur.close();
}
}
}
我正在执行一种内部查询,我认为这就是问题所在.有没有办法调整它并使其更快?
I'm performing a sort of inner query and I think that's the problem. Is there a way to tune it and make it faster?
推荐答案
private static final String[] PROJECTION = new String[] {
ContactsContract.CommonDataKinds.Email.CONTACT_ID,
ContactsContract.Contacts.DISPLAY_NAME,
ContactsContract.CommonDataKinds.Email.DATA
};
...
ContentResolver cr = getContentResolver();
Cursor cursor = cr.query(ContactsContract.CommonDataKinds.Email.CONTENT_URI, PROJECTION, null, null, null);
if (cursor != null) {
try {
final int contactIdIndex = cursor.getColumnIndex(ContactsContract.CommonDataKinds.Email.CONTACT_ID);
final int displayNameIndex = cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME);
final int emailIndex = cursor.getColumnIndex(ContactsContract.CommonDataKinds.Email.DATA);
long contactId;
String displayName, address;
while (cursor.moveToNext()) {
contactId = cursor.getLong(contactIdIndex);
displayName = cursor.getString(displayNameIndex);
address = cursor.getString(emailIndex);
...
}
} finally {
cursor.close();
}
}
注意事项:
- 仅使用
ContactsContract.CommonDataKinds.Email.CONTENT_URI
来获取您需要的信息,请参阅 ContactsContract.CommonDataKinds.Email 了解您可以查询哪些列 - 使用投影仅获取您真正需要的那些列,可以节省一些内存并提高查询性能
- 仅在 while 循环之前获取列索引一次
- use just
ContactsContract.CommonDataKinds.Email.CONTENT_URI
to get information you need, see ContactsContract.CommonDataKinds.Email for information what columns you can query - use projection to get only those columns you really need, you save some memory and increase query performance
- get column indexes only once, just before the while cycle
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