The constructor ArrayAdapter<String>(int, ArrayList<String>) is undefined

Question

Well the title says it all. I'm not sure why it doesn't want to work.

This is in an AsyncWorker so that might be the issue. Also the variables are outside of a protected method but the same happens when inside.

private class MyAsyncTask extends AsyncTask<String, String, String> {


    ListView workersList = (ListView)findViewById (R.id.workers_list);
    ArrayList<String> itemsList = new ArrayList<String>();


    protected String doInBackground(String... arg0) {

Then later on

ArrayAdapter<String> adapter = new ArrayAdapter<String>(android.R.layout.simple_list_item_1, itemsList);

You need to add a context to the constructor. This answer is extremely easily found if you just looked at the documentation. — takendarkk
– takendarkk, Commented Dec 31, 2013 at 4:12

Amulya Khare · Accepted Answer · 2013-12-31 04:12:02Z

7

You forgot the context parameter. Change to:

ArrayAdapter<String> adapter = new ArrayAdapter<String>(<ActivityName>.this, android.R.layout.simple_list_item_1, itemsList);

where replace <ActivityName> with the name of your activity class.

answered Dec 31, 2013 at 4:12

Amulya Khare

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1 Comment

justauser Over a year ago

Ok so if my activity is named MainActivity it would be ArrayAdapter<String> adapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_1, itemsList);?

Tyler Ferraro · Accepted Answer · 2013-12-31 04:13:09Z

2

Check out the documentation on ArrayAdapter. It doesn't have a constructor with parameters (int, ArrayList). If you prepend context as well then you'll have a constructor that exists.

ArrayAdapter<String> adapter = new ArrayAdapter<String>(<ActivityName>.this, android.R.layout.simple_list_item_1, itemsList);

More info: http://developer.android.com/reference/android/widget/ArrayAdapter.html

answered Dec 31, 2013 at 4:13

Tyler Ferraro

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Comments

mike20132013 · Accepted Answer · 2013-12-31 05:33:22Z

0

You need to add a context to match the parameters required.

Change your code: ArrayAdapter adapter = new ArrayAdapter(android.R.layout.simple_list_item_1, itemsList);

To

Define your context,

Context context; ArrayAdapter mArrayAdapter; . . . And when setting your adapter, mArrayAdapter = new ArrayAdapter(context,android.R.layout.simple_list_item_1, itemsList); mListView.setAdapter(mArrayAdapter);

Hope this helps.. :)

answered Dec 31, 2013 at 5:33

mike20132013

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