Splitting string[] to ArrayList and Returning Values

Question

I'm having an issue splitting a string array into a List/ArrayList. I realise this is basic stuff but I've looked at so many examples that I've now completely confused myself at what's happening (or not happening).

Some code snippets:

private String[] stringTempList;
private ArrayList<List<String>> arrayImageList = new ArrayList<List<String>>();

My list is read from a webpage and is formatted in plain text like:

So, some lines to strip out the stuff I want/don't want (note - I've separated these out to help me follow the process through):

stringExtractedList = stringText.substring(stringText.indexOf("['") + 2,
                stringText.lastIndexOf("']"));    
stringTempList = stringExtractedList.split("','");

From what I can see the above works as expected (creating an array (stringTempList), splitting out each item where it sees ',' .

Where it's going wrong:

arrayImageList.add((List<String>) Arrays.asList(stringTempList));

I expect this line to take my array (stringTempList) and move the items into an ArrayList. I was hoping to use code similar to arrayImageList.get(i); to access individual elements.

However, the code above seems to add all items to the first index in arrayImageList (list size is always 1). Running some debug tests eg Log.d("Test", arrayImageList.get(0)); returns the following:

[One,Two,Three,Four, etc...] 

I'd be grateful if someone could point me in the right direction. I think I've confused two different ideas here.

Answer 1

I think you want to use addAll() instead of add()

You'll also want to declare

private List<String> arrayImageList = new ArrayList<String>();

Answer 2

Change arrayImageList to a list of strings:

private ArrayList<String> arrayImageList = new ArrayList<String>();

and add them using the addAll method:

arrayImageList.addAll((List<String>) Arrays.asList(stringTempList));

Answer 3

您要使用addAll而不是add 。

Answer 4

I'm not sure i got this "wrong the right way", and I'm not that familiar with java, but here are my thoughts:

Your "arrayImageList" object is an ArrayList of List's. When youre adding your stringTempList-object, that object is correctly stored at the first available index of your 'List-of-lists'. If you want to access the individual elements (strings) from your "arrayImageList", you either have to adress the second dimension (the list of the list) like this:

arrayImageList.get(0).get(i) <- not entirely sure about java-syntax here, but you get the picture.

If on the other hand you dont need the extra dimension, just use ArrayList instead og ArrayList>.