CODEWITHSUNDEEP
androidxmllistview
Nelmo
Nelmo

Reputation: 215

ListView in XML file not being picked up

Problems trying to display data from a DB to a listview using a custom cursor adapter. I think I have traced the issue to not being able to 'find' my listview element from the xml file.

In my XML file, I have this:

<LinearLayout
    android:layout_width="fill_parent" 
    android:layout_height="0dp" 
    android:orientation="horizontal"
    android:layout_weight="7" >

    <ListView
        android:id="@+id/android:list"
        android:background="?android:attr/activatedBackgroundIndicator"
        android:choiceMode="singleChoice"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

I have this in my main onCreate for my activity:

setContentView(R.layout.activity_trip_display);
.... // other code
tripList = (ListView) findViewById(R.id.list);

But that last line produces a 'list cannot be resolved or is not a field' error in Eclipse.

If I add 'android' in there:

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

it compiles OK but then I get a null entry for the variable 'tripList' which causes other NPE errors.

Any ideas?

EDIT: ok, I think my problem is my cursor adapter - will post a new question. Thank you all for looking...

Upvotes: 0

Views: 76

Answers (4)

M D
M D

Reputation: 47817

If your ListView id is android:id=@android:id/list" then no need to defined

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

and your Activity must Extends ListActivity and also no need to add setContentView() as @AndroidWarrior's comment

and if your ListView id is android:id="@+id/list" then initialized your ListView with

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

Go to this for more Demos http://www.vogella.com/tutorials/AndroidListView/article.html

Upvotes: 1

Android
Android

Reputation: 398

I think the problem with android:id="@+id/android:list" replace with this

android:id="@+id/list" and extend your application to Activity is enough.

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

accept ans if problem solved.

Upvotes: 0

Piyush
Piyush

Reputation: 18923

If you want to use this in your coding

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

then your class must be extends with ListActivity.

and change in your xml for ListView id like 

 android:id="@+id/android:list"

to

 android:id ="@android:id/list"

Upvotes: 0

Martynas
Martynas

Reputation: 627

Instead of android:id="@+id/android:list" use android:id="@+id/list"

Upvotes: 0

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