Android的棒棒糖错误：试图读取手机contcats空指针异常 [英] Android lollipop error: Null pointer exception while trying to read phone contcats
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问题描述
我有以下错误尝试读取在Nexus 5的电话联系（更新至棒棒糖）而已。
I have got the following error while trying to read phone contact in Nexus 5(updated to lollipop) only.
java.lang.NullPointerException: Attempt to invoke interface method 'boolean android.database.Cursor.moveToNext()' on a null object reference
at mycomp.android.ui.fragments.DirectoriesFragment.readContacts(SourceFile:595)
at mycomp.android.ui.fragments.DirectoriesFragment.processOneDirectory(SourceFile:744)
at mycomp.android.ui.fragments.DirectoriesFragment.onLoadFinished(SourceFile:722)
at mycomp.android.utils.RESTLoaderFragment.onLoadFinished(SourceFile:1)
at android.app.LoaderManagerImpl$LoaderInfo.callOnLoadFinished(LoaderManager.java:483)
at android.app.LoaderManagerImpl$LoaderInfo.onLoadComplete(LoaderManager.java:451)
at android.content.Loader.deliverResult(Loader.java:144)
at mycomp.android.utils.loader.RESTLoader.deliverResult(SourceFile:322)
at mycomp.android.utils.loader.RESTLoader.deliverResult(SourceFile:1)
at android.content.AsyncTaskLoader.dispatchOnLoadComplete(AsyncTaskLoader.java:265)
at android.content.AsyncTaskLoader$LoadTask.onPostExecute(AsyncTaskLoader.java:92)
at android.os.AsyncTask.finish(AsyncTask.java:632)
at android.os.AsyncTask.access$600(AsyncTask.java:177)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
我使用以下code检索手机通讯录
i am using following code to retrieve contacts from phone
private void readContacts() {
ContentResolver cr = getActivity().getContentResolver();
Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI, null,
null, null, null);
Cursor c = null ;
Cursor pCur = null;
try {
String phone = null;
if (cur.getCount() > 0) {
while (cur.moveToNext()) {
try {
DirectoryRecordEntry entry = null;
String id = cur.getString(cur
.getColumnIndex(ContactsContract.Contacts._ID));
String name = cur
.getString(cur
.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
int idIndex = cur.getColumnIndexOrThrow(Contacts._ID);
long ids = cur.getLong(idIndex);
Uri rawContactUri = ContentUris.withAppendedId(
RawContacts.CONTENT_URI, ids);
Uri entityUri = Uri.withAppendedPath(rawContactUri,
Entity.CONTENT_DIRECTORY);
c= getActivity().getContentResolver().query(entityUri,
new String[]{
RawContacts.SOURCE_ID}, null, null, null);
String source_id = "";
//获得空指针异常这里，c为null：（
// Getting null pointer exception here, c is null :(
while (c.moveToNext()) {
source_id = c.getString(0);
}
if (Integer
.parseInt(cur.getString(cur
.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0) {
if (source_id != null && source_id.length()>0) {
entry = new OutlookContactEntry(name, "");
} else {
entry = new PhoneNumberEntry(name, "");
}
pCur = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
null,
ContactsContract.CommonDataKinds.Phone.CONTACT_ID
+ " = ?", new String[]{id},
null);
while (pCur.moveToNext()) {
try {
phone = pCur
.getString(pCur
.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
int phoneType = pCur
.getInt(pCur
.getColumnIndex(ContactsContract.CommonDataKinds.Phone.TYPE));
if (entry instanceof OutlookContactEntry) {
OutlookContactEntry oEntry = (OutlookContactEntry) entry;
oEntry.addContact(getType(phoneType), phone);
} else {
entry.getPhNumberList().add(phone);
}
} catch (Exception e) {
Log.e(CLASS_NAME, "Error in retrieving contacts from phone",e);
}
}
}
if (entry != null) {
if (entry instanceof OutlookContactEntry) {
OutlookContactEntry oEntry = (OutlookContactEntry) entry;
List<String> list =new ArrayList<String>(oEntry.getContacts().values());
if(!list.isEmpty()){
entry.setNumber(list.get(0));
}
}else{
if(!entry.getPhNumberList().isEmpty()){
entry.setNumber(entry.getPhNumberList().get(0));
}
}
objListRowRecord.put(name, entry);
}
} catch (Exception e) {
Log.e(CLASS_NAME, "Error in retrieving contacts from phone",e);
}
}
}
} catch (Exception e) {
Log.e(CLASS_NAME, "Error in retrieving contacts from phone",e);
}finally
{
try {
if(pCur!=null){
pCur.close();
}
if(c!=null){
c.close();
}
if(cur!=null){
cur.close();
}
cr=null;
} catch (Exception e) {
Log.e(CLASS_NAME, "Error closing cursor",e);
}
}
}
我只更新到奇巧后棒棒糖遇到了这个问题。
i have encountered this problem only after updating the kitkat to lollipop
它可以由一个空检查来解决，但我真的想知道背后的原因。
It can be resolved by a null check but i really want to know the reason behind it.
任何帮助将AP preciated
Any help would be appreciated
感谢
Amith
推荐答案
的<一个href=\"http://developer.android.com/reference/android/content/ContentResolver.html#query%28android.net.Uri,%20java.lang.String[],%20java.lang.String,%20java.lang.String[],%20java.lang.String%29\"相对=nofollow> ContentResolver.query（）说的文档：
返回结果
A光标对象，它被定位在第一项之前，还是空
Returns
A Cursor object, which is positioned before the first entry, or null
它返回空，因为它允许这样做。
It returns null because it is allowed to do so.
您总是需要一个空检查查询内容解析器的时候。
You always need a null check when querying a content resolver.
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