Constructor is undefined in Custom ArrayAdapter

Question

I know this has been solved a million times and yes i have searched, but it doesn't work for me.

The problem is that method super doesn't want proper arguments.

The code:

public class QuotesArrayAdapter extends ArrayAdapter<Map<Integer,List<String>>> {
private Context context;
Map<Integer,List<String>> Values;
static int textViewResId;
Logger Logger;

public QuotesArrayAdapter(Context context, int textViewResourceId, Map<Integer,List<String>> object) {
    super(context, textViewResourceId, object);   //<---- ERROR HERE
    this.context = context;
    this.Values = object;
    Logger = new Logger(true);
    Logger.l(Logger.TAG_DBG, "ArrayAdapter Inited");
}

What Eclipse says:

Multiple markers at this line
- The constructor ArrayAdapter<Map<Integer,List<String>>>(Context, int, Map<Integer,List<String>>) 
 is undefined
- The constructor ArrayAdapter<Map<Integer,List<String>>>(Context, int, Map<Integer,List<String>>) 
 is undefined

It wants super(Context, int) and that's not what i want

Jon Skeet · Accepted Answer · 2012-11-17 22:49:24Z

5

Look at the constructors available for ArrayAdapter.

ArrayAdapter(Context context, int textViewResourceId)
ArrayAdapter(Context context, int resource, int textViewResourceId)
ArrayAdapter(Context context, int textViewResourceId, T[] objects)
ArrayAdapter(Context context, int resource, int textViewResourceId, T[] objects)
ArrayAdapter(Context context, int textViewResourceId, List<T> objects)
ArrayAdapter(Context context, int resource, int textViewResourceId, List<T> objects)

None of those matches your arguments.

Which one did you intend to invoke? Your T here is Map<Integer,List<String>>, but your constructor's object parameter is of exactly that type. If you want to use one of the constructors which requires a collection, you need to build that collection from that single object you've got.

The simplest approach is probably just to use:

public QuotesArrayAdapter(Context context, int textViewResourceId,
                          Map<Integer,List<String>> object) {
    super(context, textViewResourceId);
    add(object);
    ...
}

answered Nov 17, 2012 at 22:49

Jon Skeet

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3 Comments

Nik Over a year ago

Oh i got it! I changed arguments and it worked! thanks a lot!

Sam Over a year ago

@DrBigNik (While my answer is not superior.) By calling add(object) you will create a List<Map<Integer, List<String>>> with one item... I wouldn't put "efficient" among the potential adjectives for this Collection. I highly recommend restructuring your data to simply use a List or writing the adapter that you do want yourself. (I'll give Jon Skeet an upvote anyway for making it work.)

Nik Over a year ago

Yeah i think i will write my own Adapter, 'cause using a List will not be good in my situation. Thanks for your help.

Sam · Accepted Answer · 2012-11-17 22:50:20Z

1

Quite simply there is no constructor in ArrayAdapter that takes a Map...

You need to convert it into a List or primitive Array, if neither of those options work then you will have to extend BaseAdapter instead.

answered Nov 17, 2012 at 22:50

Sam

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Comments

Maxim Shoustin · Accepted Answer · 2012-11-17 22:58:34Z

1

In additional you can use Arrays.asList(..)

public QuotesArrayAdapter(Context context, int textViewResourceId, Map<Integer,List<String>> object) {
    super(context, textViewResourceId,  Arrays.asList(object));   
....

answered Nov 17, 2012 at 22:58

Maxim Shoustin

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