Android 正在获取选定联系人的手机号码

我想检索所选联系人的。但不返回任何内容，因为它生成运行时异常

String[] Phoneprojection = {Phone.NUMBER,Phone.TYPE};
                String[] projection ={Contacts.DISPLAY_NAME};
                String selection = ContactsContract.Contacts.HAS_PHONE_NUMBER + "=1";
                Cursor cursor = null;
                Cursor phone = null;
                try
                {
                    cursor =  managedQuery(intent.getData(), projection, selection, null, null);
                    while (cursor.moveToNext()) 
                    {           
                       String contactId = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
                       // String name = cursor.getString(cursor.getColumnIndexOrThrow(ContactsContract.Contacts.DISPLAY_NAME));

                        phone = managedQuery(Phone.CONTENT_URI,Phoneprojection,Data.CONTACT_ID + "=?",
                                new String[]{String.valueOf(contactId)},
                                null);
                        if(phone.moveToFirst()) {
                            final int contactNumberColumnIndex = phone.getColumnIndex(Phone.NUMBER);
                            final int contactTypeColumnIndex = phone.getColumnIndex(Phone.TYPE);

                            while(!phone.isAfterLast()) {
                                final String number = phone.getString(contactNumberColumnIndex);
                                //final int type = phone.getInt(contactTypeColumnIndex);
                                //final int typeLabelResource = Phone.getTypeLabelResource(type);
                            //  if(typeLabelResource==2)
                                phonenumber.setText(number);
                                Log.e("TAG1",phonenumber.toString());
                                phone.moveToNext();
                            }

                        }                       
                   }  
                }
                catch (Exception npe)
                {
                    Log.e("TAG2", "Error trying to get Contacts."+npe.getMessage());
                }

生成的日志为： 尝试获取联系人时出错。无法从游标窗口读取第0行第1列。在从光标访问数据之前，确保光标已正确初始化。

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谁能告诉我如何解决这个问题。

您可以立即访问外部光标，但您甚至不确定它是否实际返回了数据

while (cursor.moveToNext()) {           
  String contactId = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
  // String name = cursor.getString(cursor.getColumnIndexOrThrow(ContactsContract.Contacts.DISPLAY_NAME));

将While循环更改为do-While-one和call

if (!cursor.moveToFirst())
  return;

---

这将确保您的查询实际得到一个结果。

您的代码是错误的。没有联系人。\u ID包含在您的投影中

String[] projection ={Contacts.DISPLAY_NAME}; // add Contacts._ID if you wanna query it
String contactId = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));