Android 光标错误 - 确保光标已正确初始化

Question

我已经设置了一个光标，我想返回一个有电话号码的联系人的列表视图。因此，在每个单元格中，我都会在下方显示联系人姓名和电话号码。这段代码主要完成了这项工作：

// this query only return contacts with phone number and is not duplicated
        phones = getContentResolver().query(
                ContactsContract.Contacts.CONTENT_URI,
                null,
//                we only want contacts that have a name and a phone number. If they have a phone number, the value is 1 (if not, it is 0)
                ContactsContract.Contacts.IN_VISIBLE_GROUP + " = '" + ("1") + "'" + " AND " + ContactsContract.Contacts.HAS_PHONE_NUMBER + "=1",
                null,
                ContactsContract.Contacts.DISPLAY_NAME + " COLLATE LOCALIZED ASC");

然后在提取信息并将其放入每个单元格时：

        while (phones.moveToNext()) {

            String name = phones.getString(phones.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
            String phoneNumber = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));

我收到一个错误，部分代码是：

04-07 10:43:46.489  17742-17760/com.example.chris.contactlistcustomlistview E/CursorWindow﹕ Failed to read row 0, column -1 from a CursorWindow which has 134 rows, 34 columns.
04-07 10:43:46.489  17742-17760/com.example.chris.contactlistcustomlistview W/dalvikvm﹕ threadid=11: thread exiting with uncaught exception (group=0x416168e0)
04-07 10:43:46.489  17742-17760/com.example.chris.contactlistcustomlistview E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1
    java.lang.RuntimeException: An error occured while executing doInBackground()
            at android.os.AsyncTask$3.done(AsyncTask.java:299)
            at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
            at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
            at java.util.concurrent.FutureTask.run(FutureTask.java:239)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
            at java.lang.Thread.run(Thread.java:841)
     Caused by: java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow.  Make sure the Cursor is initialized correctly before accessing data from it.
            at android.database.CursorWindow.nativeGetString(Native Method)

所以，光标从Contacts.Contracts 跳到ContactsContract.CommonDataKinds.Phone，它不喜欢它。但是我还能如何获取用户的电话号码？据我所知，它不在ContactsContracts.Contacts 中。在转到CommonDataKinds 之前我应该​​重新初始化光标还是什么？我该怎么做？

Answer 1

您是否尝试过在phones.moveToNext() 之前调用phones.moveToFirst()？它移动到第一行。这是因为您当前的查询返回一个位于第一个条目之前的 Cursor 对象。

你可以试试写：

if (phones.moveToFirst()) {

       while (phones.moveToNext()) {
                    // etc

Answer 2

if (phones != null) {
    phones.moveToFirst();
}