android - 如何在一次 SQLite 查询中获取联系人 ID、电子邮件、电话号码？联系人 Android 优化

Question

我想至少用一个电话号码获取所有联系人，我还想要每个联系人的所有电话号码和所有电子邮件。

当前代码:

// To get All Contacts having atleast one phone number.

Uri uri = ContactsContract.Contacts.CONTENT_URI;
String selection = ContactsContract.Contacts.HAS_PHONE_NUMBER + " > ?";
String[] selectionArgs = new String[] {"0"};
Cursor cu = applicationContext.getContentResolver().query(uri, 
                null, selection, selectionArgs, null);

// For getting All Phone Numbers and Emails further queries : 
while(cu.moveToNext()){
String id = cu.getString(cu.getColumnIndex(ContactsContract.Contacts._ID));


 // To get Phone Numbers of Contact
    Cursor pCur = context.getContentResolver().query(
    ContactsContract.CommonDataKinds.Phone.CONTENT_URI,  null,ContactsContract.CommonDataKinds.Phone.CONTACT_ID + "=?",
 new String[]{id}, null);

// To get Email ids of Contact
Cursor emailCur = context.getContentResolver().query(
ContactsContract.CommonDataKinds.Email.CONTENT_URI, null,
ContactsContract.CommonDataKinds.Email.CONTACT_ID + " = ?",
new String[]{id}, null); 

// Iterate through these cursors to get Phone numbers and Emails
}

如果我的设备中有超过 1000 个联系人，这将花费太多时间。如何在单个查询中获取所有数据，而不是为每个联系人执行两个额外的查询？

或者有没有其他优化方法？

在此先感谢您。

Answer 1

ICS:当您从 Data.CONTENT_URI 查询时，关联的 Contact 中的所有行都已加入 - 即这会起作用:

ContentResolver resolver = getContentResolver();
Cursor c = resolver.query(
        Data.CONTENT_URI, 
        null, 
        Data.HAS_PHONE_NUMBER + "!=0 AND (" + Data.MIMETYPE + "=? OR " + Data.MIMETYPE + "=?)", 
        new String[]{Email.CONTENT_ITEM_TYPE, Phone.CONTENT_ITEM_TYPE},
        Data.CONTACT_ID);

while (c.moveToNext()) {
    long id = c.getLong(c.getColumnIndex(Data.CONTACT_ID));
    String name = c.getString(c.getColumnIndex(Data.DISPLAY_NAME));
    String data1 = c.getString(c.getColumnIndex(Data.DATA1));

    System.out.println(id + ", name=" + name + ", data1=" + data1);
}

如果您的目标是 2.3，则需要考虑到 HAS_PHONE_NUMBER 无法通过查询 Data 时使用的连接获得。

有趣。

例如，这可以通过跳过联系人必须有电话号码的要求来解决，而是选择“任何至少有电话号码或电子邮件地址的联系人” ":

Cursor c = resolver.query(
        Data.CONTENT_URI, 
        null, 
        Data.MIMETYPE + "=? OR " + Data.MIMETYPE + "=?", 
        new String[]{Email.CONTENT_ITEM_TYPE, Phone.CONTENT_ITEM_TYPE},
        Data.CONTACT_ID);

如果这不是一个选项，你总是可以选择一个可怕的 hacky 子选择:

Cursor c = resolver.query(
        Data.CONTENT_URI, 
        null, 
        "(" + Data.MIMETYPE + "=? OR " + Data.MIMETYPE + "=?) AND " + 
        Data.CONTACT_ID + " IN (SELECT " + Contacts._ID + " FROM contacts WHERE " + Contacts.HAS_PHONE_NUMBER + "!=0)", 
        new String[]{Email.CONTENT_ITEM_TYPE, Phone.CONTENT_ITEM_TYPE}, Data.CONTACT_ID);

或者用两个 Cursors:

解决

Cursor contacts = resolver.query(Contacts.CONTENT_URI, 
        null, Contacts.HAS_PHONE_NUMBER + " != 0", null, Contacts._ID + " ASC");
Cursor data = resolver.query(Data.CONTENT_URI, null, 
        Data.MIMETYPE + "=? OR " + Data.MIMETYPE + "=?", 
        new String[]{Email.CONTENT_ITEM_TYPE, Phone.CONTENT_ITEM_TYPE}, 
        Data.CONTACT_ID + " ASC");

int idIndex = contacts.getColumnIndexOrThrow(Contacts._ID);
int nameIndex = contacts.getColumnIndexOrThrow(Contacts.DISPLAY_NAME);
int cidIndex = data.getColumnIndexOrThrow(Data.CONTACT_ID);
int data1Index = data.getColumnIndexOrThrow(Data.DATA1);
boolean hasData = data.moveToNext();

while (contacts.moveToNext()) {
    long id = contacts.getLong(idIndex);
    System.out.println("Contact(" + id + "): " + contacts.getString(nameIndex));
    if (hasData) {
        long cid = data.getLong(cidIndex);
        while (cid <= id && hasData) {
            if (cid == id) {
                System.out.println("\t(" + cid + "/" + id + ").data1:" + 
                        data.getString(data1Index));
            }
            hasData = data.moveToNext();
            if (hasData) {
                cid = data.getLong(cidIndex);
            }
        }
    }
}