嗨我正在使用服务阅读收件箱，但是当我创建游标以读取收件箱时我得到空指针异常我现在能够读取具有相同代码的短信我想将这些短信存储到SD卡中的xml文件中但是我得到一个空指针异常。任何帮助将不胜感激。 我的代码在这里
// 在此输入代码
public class CreateBackupXml extends Service
{
CreateBackup createBackup = null;
@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}
public void onCreate(Bundle savedinstance)
{
Log.d("service","inside on create of service");
}
public void onDestroy()
{
}
public void onStart(Intent intent, int startid)
{
Toast.makeText(this, "Creating Back up", Toast.LENGTH_LONG).show();
Log.d("animation", "animation should be Start");
createBackup = new CreateBackup();
createBackup.createXml("all");
}
public class CreateBackup
{
Uri uriSMSURI = Uri.parse("");
Cursor cur=null;
public void createXml(String choice)
{
if(choice=="all")
{
this.readSms("Inbox");
}
}
public void readSms(String folder)
{
if(folder.equals("inbox"))
{
uriSMSURI = Uri.parse("content://sms/inbox");
}
else if(folder.equals("sent"))
{
uriSMSURI = Uri.parse("content://sms/sent");
}
try{
Log.d("folder","inside of inbox");
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
Log.d("checking","1111111111111");
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
Log.d("checking","2222222222");
Document document = documentBuilder.newDocument();
Log.d("checking","333333333333");
Element rootElement = document.createElement("SMSBackUp");
Log.d("checking","444444444");
rootElement.setAttribute("category", folder);
Log.d("checking","5555555555");
rootElement.setAttribute("owener", "gaurav");
Log.d("checking","6666666666");
cur = getContentResolver().query(uriSMSURI, null, null, null,null);
Log.d("checking",""+cur);
Log.d("checking","7777777777777");
while (cur.moveToNext())
{
Log.d("checking","88888888");
Element smsElement = document.createElement("sms");
rootElement.appendChild(smsElement);
Element text = document.createElement("text");
smsElement.appendChild(text);
text.appendChild(document.createTextNode(cur.getString(11)));
Element phonenoElement = document.createElement("number");
smsElement.appendChild(phonenoElement);
phonenoElement.appendChild(document.createTextNode(cur.getString(2)));
Element nameElement = document.createElement("author");
smsElement.appendChild(nameElement);
nameElement.appendChild(document.createTextNode(getContact(cur.getString(2))));
}
TransformerFactory factory = TransformerFactory.newInstance();
Transformer transformer = factory.newTransformer();
Properties outFormat = new Properties();
outFormat.setProperty(OutputKeys.INDENT, "yes");
outFormat.setProperty(OutputKeys.METHOD, "xml");
outFormat.setProperty(OutputKeys.OMIT_XML_DECLARATION, "no");
outFormat.setProperty(OutputKeys.VERSION, "1.0");
outFormat.setProperty(OutputKeys.ENCODING, "UTF-8");
transformer.setOutputProperties(outFormat);
DOMSource domSource = new DOMSource(document.getDocumentElement());
OutputStream output = new ByteArrayOutputStream();
StreamResult result = new StreamResult(output);
String xmlString = output.toString();
Log.d("output xml",xmlString);
}
catch(Exception e)
{
Log.e("execption ","can not create back up" +e);
}
}
private String getContact(String number)
{
Cursor cur = getContentResolver().query(ContactsContract.Contacts.CONTENT_URI,null,null,null,null);
String returnName= "";
if(cur.getCount() > 0)
{
while(cur.moveToNext())
{
String id = cur.getString(cur.getColumnIndex(ContactsContract.Contacts._ID));
Log.d("Contact","ID:" + id );
String name = cur.getString(cur.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
Log.d("Contact","name:" + name);
if (Integer.parseInt(cur.getString(cur.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0)
{
Cursor pcur = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,null,
ContactsContract.CommonDataKinds.Phone.NUMBER + "=?",new String[]{number},null);
int numindex = pcur.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DATA);
if(pcur.moveToFirst())
{
String dbNum = pcur.getString(numindex);
if(dbNum.equals(number))
{
returnName = name;
Log.d("number","number:" + dbNum);
}
else
{
Log.d("number","numbers dont match!");
}
}
else
{
Log.d("number", "no result");
}
}
else
{
Log.d("number", "No Number");
}
}
}
return returnName;
}
}
}
logcat视图
04-05 12:00:07.770: D/reading sms(456): inside of create backup for inbox
04-05 12:00:07.830: D/animation(456): animation should be Start
04-05 12:00:07.830: D/folder(456): inside of inbox
04-05 12:00:07.858: D/checking(456): 1111111111111
04-05 12:00:07.860: D/checking(456): 2222222222
04-05 12:00:07.881: D/checking(456): 333333333333
04-05 12:00:07.890: D/checking(456): 444444444
04-05 12:00:07.920: D/checking(456): 5555555555
04-05 12:00:07.920: D/checking(456): 6666666666
04-05 12:00:07.920: D/checking(456): null
04-05 12:00:07.920: D/checking(456): 7777777777777
04-05 12:00:07.920: E/execption(456): can not create back upjava.lang.NullPointerException
答案 0 :(得分：0)
//因为您的情况已经过敏
将收件箱更改为收件箱
或尝试使用
equalsIgnoreCase()
{
this.readSms("inbox");
Log.d("entering into ","inbox");
}
}
public void readSms(String folder)
{
if(folder.equals("inbox"))
uriSMSURI = Uri.parse("content://sms/inbox");
}