How to add a value to arraylist in android?

Question

I am adding a value to my arraylist but it is showing error. Before adding the value I am displaying it first. The value is displaying but it is not adding to the arraylist. Please help me regarding this...

My Code:

static ArrayList<String> allfirstids;

ArrayList<String> list = List.get(i);
UserBO user = new UserBO();

user.firstid = Integer.parseInt(list.get(0));
user.secondid = Integer.parseInt(list.get(1));
System.out.print("Hello this is first id");
System.out.print(list.get(0));

allfirstids.add(list.get(0));
System.out.println("first ids"+allfirstids);

Thanks in advance...

it is showing error? what error?

Lalit Poptani
– Lalit Poptani

2012-04-23 04:58:52 +00:00
Commented Apr 23, 2012 at 4:58 — Lalit Poptani
– Lalit Poptani, Commented Apr 23, 2012 at 4:58

Raghu Nagaraju · Accepted Answer · 2012-04-23 05:00:45Z

5

before adding, please initialize arraylist.

 allfirstids = new ArrayList<String>();

answered Apr 23, 2012 at 5:00

Raghu Nagaraju

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4 Comments

RaagaSudha Over a year ago

Hi I made very silly mistake by not initializing arraylist....thank you..now its working....

RaagaSudha Over a year ago

Hi everytime when I call the page the list.get(0) contains different value. For suppose first time list.get(0)=10 then first 10 is added...again second time in list.get(0) = 20 then it is replacing the 10...But I want to add 10,20,...to my arraylist. How can I do that?

Raghu Nagaraju Over a year ago

dont initialize allfirstids inside loop. it will reinitialize always and add the recent data. If you can post the complete method, i can tell you what exactly you have to do

Raghu Nagaraju Over a year ago

if it is inside a method, you can also do like this. put condition while initializing arraylist if(allfirstids == null) { allfirstids = new ArrayList<String>();}

user370305 · Accepted Answer · 2012-04-23 05:01:22Z

1

You forgot to initialize your static ArrayList allfirstids, Just initialize it, before using..

static ArrayList<String> allfirstids = new ArrayList<String>();

ArrayList<String> list = List.get(i);
UserBO user = new UserBO();

user.firstid = Integer.parseInt(list.get(0));
user.secondid = Integer.parseInt(list.get(1));
System.out.print("Hello this is first id");
System.out.print(list.get(0));

allfirstids.add(list.get(0));
System.out.println("first ids"+allfirstids);

answered Apr 23, 2012 at 5:01

user370305

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