Converting an ArrayAdapter to a List<String>

Question

I have an array adapter(string), and would like to convert it to a List<String>, but after a little googling and a few attempts, I am no closer to figuring out how to do this.

I have tried the following;

for(int i = 0; i < adapter./*what?*/; i++){
     //get each item and add it to the list
}

but this doesn't work because there appears to be no adapter.length or adapter.size() method or variable.

I then tried this type of for loop

for (String s: adapter){
    //add s to the list
}

but adapter can't be used in a foreach loop.

Then I did some googling for a method (in Arrays) that converts from an adapter to a list, but found nothing.

What is the best way to do this? Is it even possible?

developer.android.com/reference/android/widget/…

wyoskibum
– wyoskibum

2013-09-11 18:03:26 +00:00
Commented Sep 11, 2013 at 18:03 — wyoskibum
– wyoskibum, Commented Sep 11, 2013 at 18:03

M G · Accepted Answer · 2013-09-11 18:02:55Z

5

for(int i = 0; i < adapter.getCount(); i++){
     String str = (String)adapter.getItem(i);
}

answered Sep 11, 2013 at 18:02

M G

1,25014 silver badges28 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

jcw Over a year ago

That looks like exactly what I am looking for, thanks. I hate the fact that google can't make the length names uniform. Would it be too hard for them to have called the method size() or length?

Mickäel A. Over a year ago

Semantically, getCount() is more appropriated as it should inform about the number of views that the adapter will create, unlike the ArrayList or the array containing the data, which has indeed a size : the number of elements it contains. An ArrayAdapter doesn't necessarily contains data, so it has no size.

Mickäel A. Over a year ago

Also note that the ArrayAdapter class is generic, so if you did new ArrayAdapter(...)<String> you can avoid casting the value returned by getItem().

DwB · Accepted Answer · 2018-07-21 04:32:51Z

2

Try this

// Note to the clown who attempted to edit this code.
// this is an input parameter to this code.
ArrayAdapter blammo; 
List<String> kapow = new LinkedList<String>(); // ArrayList if you prefer.

for (int index = 0; index < blammo.getCount(); ++index)
{
    String value = (String)blammo.getItem(index);
    // Option 2: String value = (blammo.getItem(index)).toString();
    kapow.add(value);
}

// kapow is a List<String> that contains each element in the blammo ArrayAdapter.

Use option 2 if the elements of the ArrayAdapter are not Strings.

edited Jul 21, 2018 at 4:32

answered Sep 11, 2013 at 18:06

DwB

38.6k11 gold badges62 silver badges86 bronze badges

Collectives™ on Stack Overflow

Converting an ArrayAdapter to a List<String>

2 Answers 2

3 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related