i am trying enter link description here
as to add values to single as well as 2dim array dynamically,
but while adding values it shows null pointer ,
here is my code
Arr points1[];
points1 = new Arr[listItemList.size()];
for(int i=0;i<listItemList.size();i++)
{
ListItemReminderSummary listItem = listItemList.get(i);
Log.i("listItem.Car_Id", listItem.Car_Type);
points1[i].Car_Id = listItem.Car_Id;
points1[i].Car_Type = listItem.Car_Type;
}
for(int i=0;i<listItemList.size();i++)
{
System.out.println( points1[i].Car_Id + points1[i].Car_Type);
}
Null pointer at points1[i].Car_Id = listItem.Car_Id;
any suggestion,
thnx in advance.
initialize the items in Array...
for (int i = 0; i < listItemList.size(); i++) {
ListItemReminderSummary listItem = listItemList.get(i);
Log.i("listItem.Car_Id", listItem.Car_Type);
points[i] = new Arr();
points1[i].Car_Id = listItem.Car_Id;
points1[i].Car_Type = listItem.Car_Type;
}
You have to initialize cells of array.
for(int i=0;i<listItemList.size();i++){
points[i] = new Arr();
}
You have not Allocated memory to the Arr that is why you're trying to dereference an uninitialised pointer (i.e. writing to a random chunk of memory), which is undefined behaviour.
Change ur starting 2 lines
Arr points1[] = new Arr[listItemList.size()];
for (int i = 0; i < listItemList.size(); i++)
{
ListItemReminderSummary listItem = listItemList.get(i);
Log.i("listItem.Car_Id", listItem.Car_Type);
points1[i].Car_Id = listItem.Car_Id;
points1[i].Car_Type = listItem.Car_Type;
}
Did you make sure that listItemList.get(i) returns a value? Perhaps there is nothing returned from this.
Related
Declare an array of Croller(https://android-arsenal.com/details/1/5079) -
Croller[] croller = new Croller[]{binding.crollerThirtyOnetwentyHertz,binding.crollerOnetwentyFoursixtyHertz,binding.crollerFoursixtyOnekiloHertz,
binding.crollerOnekiloSevenkiloHertz,binding.crollerSevenkiloHertz};
Use it: On setting the label of Croller using data binding shows Null Pointer Exception
for (int i = 0; i < numBands; i++)
{
freqRange = eq.getBandFreqRange((short)i);
croller[i].setLabel ("Anything Printed Here"));
}
I am trying to read json array without object name, and pass it to a list.
My json looks like :
"facilites": [
"Pool",
" Air Conditioning",
" Pets Allowed",
" Fitness center",
" Kitchen",
" Internet",
" Sona"
]
I am trying to retrieve it using the following code -
for (int l = 0; l < chaletFacilities.length(); l++){
String facilities = chaletFacilities.getString(l);
list = new ArrayList<String>();
list.add(facilities);
}
Inside the main loop I put to my pojo class chalets.setList(list);
The issue is in this line list.add(facilities); it only add the last element. After looping through all, list carry sona only.
Your list should be instantiated outside the loop.
list = new ArrayList<String>();
for (int l = 0; l < chaletFacilities.length(); l++){
String facilities = chaletFacilities.getString(l);
list.add(facilities);
}
An improvement would be directly add string to list instead of capturing it into a string variable like list.add(chaletFacilities.getString(l))
Move initialization of your ArrayList outside of your loop.
Do like this
list = new ArrayList<String>();
for (int l = 0; l < chaletFacilities.length(); l++){
list.add(chaletFacilities.getString(l))
}
What you doing is initializing yourlist again and again and adding the element. So while last iteration the list is getting initialized again and only single element is being added to it.
ArrayList list = new ArrayList<String>();
for (int l = 0; l < chaletFacilities.length(); l++){
String facilities = chaletFacilities.getString(l);
list.add(facilities);
}
You are creating the new list always. So your list size will be 1 with the last value in chaletFacilities array.
Solution: Keep your list initialization outside the for loop as below, and add all the values under the array into single list you created in the top.
list = new ArrayList<String>();
for (int l = 0; l < chaletFacilities.length(); l++)
{
list.add(chaletFacilities.getString(l));
}
Data is not binding in array list as it came from the Service, as like first option which added in ArrayList is Lead, second is Qualified, and third is test. When i check list on first position it shows Qualified, Lead, test. But i want as i bind my list as it show in that sequence.
public static HashMap<String,ArrayList<LeadData>> LeadDataMap= new HashMap<String,ArrayList<LeadData>>();
public static ArrayList<String> aList = new ArrayList<String>();
for (int i = 0; i < LeadListsJSONArray.length(); i++) {
JSONObject Leadsobj = LeadListsJSONArray.getJSONObject(i);
//get stage name for hashmap key value..
String StageNameString = Leadsobj.getString("StageName");
String StageIdString = Leadsobj.getString("StageId");
System.out.println("stage id........................"+StageIdString);
//get new leads list..
JSONArray jaarr2 = new JSONArray(Leadsobj.getString("Leads"));
ArrayList<LeadData> leadDataList = new ArrayList<LeadData>();
for (int j = 0; j < jaarr2.length(); j++) {
LeadData ld = new LeadData();
JSONObject obj3 = jaarr2.getJSONObject(j);
ld.setLeadCompanyName(obj3.getString("LeadCompanyName"));
ld.setLeadId(obj3.getString("LeadId"));
ld.setTitle(obj3.getString("Title"));
leadDataList.add(ld);
}
//here we are puttin the leaddatalist inot map with respect to stage name...
LeadDataMap.put(StageNameString.trim().toString(), leadDataList);
//LeadDataMap.put(StageIdString, leadDataList);
}
In LeadDataMap data in not in that sequence in that i have put. This is the problem.
I get solution by using LinkedHashmap.
I'm tring to do a simple matrix initialization in android and I get Error: java.lang.ArrayIndexOutOfBoundsException. I'm trying this:
Integer id = Integer.valueOf(idcateg);
System.out.println("Id-ul e"+id);
vot = new Integer[sirid.length][id];
for (int i = 0; i < sirid.length; i++) {
vot[i][id] = 0;
}
where id is a value between 1 and 5,sirid.length is a number that reflects number of images from different categorys. For example,I want for category 1 to have something like this :
vot[0][1]=0;
vot[1][1]=0;
vot[2][1]=0;
...etc
Where is my mistache?
try this
Integer id = Integer.valueOf(idcateg);
System.out.println("Id-ul e"+id);
vot = new Integer[sirid.length][id];
for (int i = 0; i < sirid.length; i++) {
vot[i][id-1] = 0;
}
array index start from 0
you set the size of the vot array to sirid.lengh by id but the array start index value from 0 to (size)(size value not included) see the for loop
I think because you initialize the array on id.
After that you call to vot[i][id] which then will alway be 1 too high.
f.e.
if you create new int[3][3]
you can only call positions 0,1 and 2
good luck
That is because id has been considered as Length of the String and you r trying to access the same element... but the last element is vat[i][id-1] but u r trying to get vat[i][id]
So better use this..
for (int i = 0; i < sirid.length; i++) {
for(int j = 0; j<id ; j++){
vot[i][j] = 0;
}
}
Hi guys if i try to assign the string to string Array i am getting NULL POINTER EXCEPTION..
Pls give me a solution..
Here is my code and i am getting null pointer in this line thumbs[j]=title;
as code Follows...
for (int i = 0; i < items.getLength(); i++) {
Node item = items.item(i);
NodeList properties = item.getChildNodes();
for (int j = 0; j < properties.getLength(); j++) {
Node property = properties.item(j);
String name = property.getNodeName();
if (name.equalsIgnoreCase("title")) {
try{
property.normalize();
Spanned title2 = Html.fromHtml(property.getFirstChild().getNodeValue().replaceAll("\\<.*?>", ""));
title = title2.toString();
}catch(Exception e){
Log.v("Exception",""+e);
}
thumbs[j]=title;
}
}
}
My guess is that the thumbs[] hasn't been initialized doing something like:
String [] thumbs = new String [properties.getLength()];
Though it's hard to say - your code doesn't show your declaration of this array.
The only possibility is that thumbs is null. It isn't a compile error if you don't initialize it. Don't rely on the IDE to tell you if something initialized prove it to yourself by examining your code, or print out the value of thumbs before you use it every time.
The only other exception possibilities at that line are ArrayIndexOutOfBoundsException if j > thumbs.length-1. But again, that's not a NPE. If title was null, that's fine and not an exception.