List log = new ArrayList();

Question

I have been trying to use ArrayList.add, when I was putting just .add("some data") it worked fine, when I tried assigning the id - .add(1, "some data"); I keep getting the error when I try running the app - "The application MobileApp(process com.example.mobileapp) has stopped unexpectedly. Please try again.".

This is the next code that I am running:

    List<String> log = new ArrayList<String>();
    log.add(1, "some data");

This works fine:

    List<String> log = new ArrayList<String>();
    log.add("some data");

What I want to achieve from this:

ListView will have list of items, each item would have specific "id".
On click this "id" will be picked up and user is moved to different layout where further information is shown on item with selected "id".

from doc `Throws: IndexOutOfBoundsException - if the index is out of range (index < 0 || index > size())` size() is zero your index is 1 ... — Selvin, Apr 04 '13 at 20:45
You should consider a `Map` if you want `each item would have specific "id"` — WarrenFaith, Apr 04 '13 at 20:56
Please learn how to look at the output of logcat. You will see that there is an ArrayIndexOutOfBoundsException being thrown. — Sky Kelsey, Apr 04 '13 at 20:58

score 5 · Accepted Answer · answered Apr 04 '13 at 20:46

5

You are trying to add an item at index 1 which doesn't exist. You will need to change the code to insert into the 0 position first.

List<String> log = new ArrayList<String>();
log.add(0, "some data");

If you need specific IDs that do not correspond to the index, you might want to look into using a Map.

answered Apr 04 '13 at 20:46

Yes, it seems that Map would be an option for me to take, because I might not have item with "id" of 0 in the list. How would I go about supplying it to ArrayAdapter? – user1652382 Apr 04 '13 at 21:36
Here is an answer that entails extending BaseAdapter for use with a HashMap http://stackoverflow.com/questions/5234576/what-adapter-shall-i-use-to-use-hashmap-in-a-listview – Apr 04 '13 at 21:45
1

I also found this guide - http://www.vogella.com/articles/AndroidListView/article.html – user1652382 Apr 04 '13 at 21:47

score 3 · Answer 2 · answered Apr 04 '13 at 20:45

3

Try this

List<String> log = new ArrayList<String>();
log.add(0, "some data");//Changed from 1 to 0

I think you need to start from 0. You cannot insert 1 if we dont have data in 0th position.

answered Apr 04 '13 at 20:45

Joseph Selvaraj

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I think you beet me by a minute :) – Joseph Selvaraj Apr 04 '13 at 20:52

List log = new ArrayList();

2 Answers2