CODEWITHSUNDEEP
androidlistview
Woowoo
Woowoo

Reputation: 25

Error "Cannot resolve symbol 'listView'" for a CustomListAdapter

I am currently working on a basic custom ListAdapater.
On my MainActivity, it shows this error when trying to find my ListView from my XML file.

Here is my MainActivity.java:

public class MainActivity extends ListActivity {

    ListView list;

    String[] itemName = {
            "Item 1",
            "Item 2",
            "Item 3"
    };
    String [] itemContent = {
            "Item Content 1",
            "Item Content 2",
            "Item Content 3"
    };

    Integer[] imageId = {
            R.mipmap.pic1,
            R.mipmap.pic2,
            R.mipmap.pic3,
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        CustomListAdapter adapter = new CustomListAdapter(this, itemName, itemContent, imageId);
        list = (ListView)findViewById(R.id.list);
        list.setAdapter(adapter);

        list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
                String SelectedItem = itemName[+position];
                Toast.makeText(getApplicationContext(), SelectedItem, Toast.LENGTH_SHORT).show();
            }
        });
    }
}

and here is the XML:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"

    <ListView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@android:id/list"
        android:layout_centerHorizontal="true" />

</RelativeLayout>

I actually had a different error before for this issue here.
My code showed completely fine apart from the error with the android:id, and this fixed this particular issue, but I now have the error with the R.id.list.

I also tried the suggestion of just Activity and dropping the keyword android in the XML.
Also fixed my old error but not this one.
I have just posted my original code however.

Upvotes: 2

Views: 5846

Answers (2)

OneCricketeer
OneCricketeer

Reputation: 191681

This findViewById line isn't completely necessary in a ListActivity

list = (ListView)findViewById(R.id.list);

It can instead be gotten with getListView(), or you can do that manually

list = (ListView)findViewById(android.R.id.list);

Basically, your XML is using android.R.id.list, and not R.id.list. There's a difference.

If you see the error that ListView cannot be resolved, then you are missing an import statement.

Upvotes: 2

androidXP
androidXP

Reputation: 1719

As @Sourav noted in above code that you didn't add + sign into android:id="@android:id/list". By adding + sign into id means you are giving ( Assigning )new ID to that element but without + means you are refer some other ID which is already declared somewhere else in your code

Upvotes: 0

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