android - 使用 CursorLoader 由联系人填充的 AutoCompleteTextView

Question

我正在尝试制作一个 AutoCompleteTextView 女巫来完成联系人列表中的用户输入，我做到了，但它造成了很大的性能损失。

我尝试使用 CursorLoader ( https://developer.android.com/training/load-data-background/setup-loader.html )

应用现在强制关闭:

 07-30 05:02:45.034: E/AndroidRuntime(1396): FATAL EXCEPTION: main
 07-30 05:02:45.034: E/AndroidRuntime(1396): java.lang.ClassCastException:  
 android.content.CursorLoader cannot be cast to android.database.Cursor 

代码:

@Override
public Loader<Cursor> onCreateLoader(int loaderID, Bundle bundle)
{
    /*
     * Takes action based on the ID of the Loader that's being created
     */
    switch (loaderID) {
        case NAMES_LOADER:
            // Returns a new CursorLoader
            CursorLoader peopleCursor = new CursorLoader(
                        context,   // Parent activity context
                        ContactsContract.Contacts.CONTENT_URI,        // Table to query
                        null,     // Projection to return
                        null,            // No selection clause
                        null,            // No selection arguments
                        null             // Default sort order
        );

            while (((Cursor) peopleCursor).moveToNext()) {
                contactName = ((Cursor) peopleCursor).getString(((Cursor)  peopleCursor)
                        .getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
               contactId = ((Cursor) peopleCursor).getString(((Cursor) peopleCursor)
                        .getColumnIndex(ContactsContract.Contacts._ID));
                hasPhone = ((Cursor) peopleCursor)
                        .getString(((Cursor) peopleCursor)
                                .getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER));
            }



        case PHONES_LOADER:
             if ((Integer.parseInt(hasPhone) > 0)){
            CursorLoader phonesCursor = new CursorLoader(
                    context, // Parent activity context
                    ContactsContract.CommonDataKinds.Phone.CONTENT_URI,        // Table to query
                    null,
                    ContactsContract.CommonDataKinds.Phone.CONTACT_ID +" = "+ contactId, // Projection to return
                    null,            // No selection clause
                    null            // No selection arguments
                                 // Default sort order
    );

            while (((Cursor) phonesCursor).moveToNext()){
                //store numbers and display a dialog letting the user select which.
                String phoneNumber = ((Cursor) phonesCursor).getString(
                        ((Cursor) phonesCursor).getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                Map<String, String> NamePhoneType = new ContactMap();
                NamePhoneType.put("Name", contactName);
                NamePhoneType.put("Phone", phoneNumber);

                    mPeopleList.add(NamePhoneType);
            }

             }
        default:
            // An invalid id was passed in
            return null;
    }
}  

这是错误的部分:

 while (((Cursor) peopleCursor).moveToNext()) {
            contactName = ((Cursor) peopleCursor).getString(((Cursor)  peopleCursor)
                    .getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
           contactId = ((Cursor) peopleCursor).getString(((Cursor) peopleCursor)
                    .getColumnIndex(ContactsContract.Contacts._ID));
            hasPhone = ((Cursor) peopleCursor)
                    .getString(((Cursor) peopleCursor)
                            .getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER));
        }

错误是因为我正在将 Cursor 转换为 CursorLoader，我找不到另一种方法来完成它，因为我需要的方法在 CursorLoader 类型中不可用。

有人有解决办法吗？或另一种在不破坏性能的情况下自动完成联系人的方法？谢谢!

Answer 1

由于没有其他人提供答案，我建议在创建游标后在 onLoaderFinish 中填充您的数组。 Cursor Loader 本质上是一个查询语句而不是结果，这就是为什么您不能从 CursorLoader 转换为 Cursor。