获取姓名和电子邮件从联系人列表很慢 [英] Getting name and email from contact list is very slow

问题描述

我实现一个AutoCompleteTextView，我需要姓名和我所有的联系人的电子邮件。 我发现这个片段，我异步运行，但它是非常缓慢的。

  ContentResolver的CR = getContentResolver（）;
光标CUR = cr.query（ContactsContract.Contacts.CONTENT_URI，NULL，NULL，NULL，NULL）;

如果（cur.getCount（）大于0）{
    而（cur.moveToNext（））{
        字符串ID = cur.getString（cur.getColumnIndex（ContactsContract.Contacts._ID））;
        字符串名称= cur.getString（cur.getColumnIndex（ContactsContract.Contacts.DISPLAY_NAME））;

        光标emailCur = cr.query（ContactsContract.CommonDataKinds.Email.CONTENT_URI，空，ContactsContract.CommonDataKinds.Email.CONTACT_ID +=？，新的String [] {ID}，NULL）;

            而（emailCur.moveToNext（））{

                字符串email = emailCur.getString（emailCur.getColumnIndex（ContactsContract.CommonDataKinds.Email.DATA））;
                    autoCompleteAdapter.add（姓名+ - +电子邮件）;
            }

            emailCur.close（）;
        }
    }
}
 

我进行某种内部查询的，我认为这就是问题所在。有没有办法对其进行调整，使之更快？

解决方案

 私有静态最后的String []投影=新的String [] {
    ContactsContract.CommonDataKinds.Email.CONTACT_ID，
    ContactsContract.Contacts.DISPLAY_NAME，
    ContactsContract.CommonDataKinds.Email.DATA
};

...

ContentResolver的CR = getContentResolver（）;
光标光标= cr.query（ContactsContract.CommonDataKinds.Email.CONTENT_URI，投影，NULL，NULL，NULL）;
如果（光标！= NULL）{
    尝试 {
        最终诠释contactIdIndex = cursor.getColumnIndex（ContactsContract.CommonDataKinds.Email.CONTACT_ID）;
        最终诠释displayNameIndex = cursor.getColumnIndex（ContactsContract.Contacts.DISPLAY_NAME）;
        最终诠释emailIndex = cursor.getColumnIndex（ContactsContract.CommonDataKinds.Email.DATA）;
        长的ContactID;
        字符串显示名，地址;
        而（cursor.moveToNext（））{
            使用ContactID = cursor.getLong（contactIdIndex）;
            显示名= cursor.getString（displayNameIndex）;
            地址= cursor.getString（emailIndex）;
            ...
        }
    } 最后 {
        cursor.close（）;
    }
}
 

几个注意事项：

• 使用刚 ContactsContract.CommonDataKinds.Email.CONTENT_URI 来得到你需要的信息，请参阅<一href="http://developer.android.com/reference/android/provider/ContactsContract.CommonDataKinds.Email.html">ContactsContract.CommonDataKinds.Email信息哪些列可以查询
• 使用投影只得到那些你真正需要的，你节省一些内存和提高查询性能列
• 在获得列索引一次，就在同时，周期之前

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();
        }
    }
}

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?

解决方案

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();
    }
}

few notes:

• 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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