Develop Reference

Activity having a list and other UI

I have an activity which has an independent ImageView and a List. Earlier, I have worked with activities which were simple list activities and the code worked fine. But now I am having an error which says
your content must have a ListView whose attribute is 'android.R.id.list'
The original code:
setArrayAdapter(ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, getResources().getStringArray(partsId[position])));
XML:
<ListView
android:id="#+android:id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" >
</ListView>
After some research, I came to the conclusion that may be I have to use a ListView and attach that attibute to my list. I did some change in the XML too. So revised code:
new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, getResources().getStringArray(partsId[position]));
lvParts.setAdapter(adapter);
XML:
<ListView
android:id="#+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" >
</ListView>
I think the reason this is happening is my Activity now has an ImageView also along with the List. Can anyone help?

android:id="#+android:id/list"
Change your listview id to above...
<ListView
android:id="#+android:id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" >
</ListView>

You have to extends your class to ListActivity instead of Activity

trouble associating a listView id with findViewby() in android

I am trying to populate a list view, and am trying to select my listview in my main with:
lv = (ListView) findViewById(R.layout.activity_main.xml.id);
My folder structure for XML is:
res>layout>activity_main.xml
and my main_activity.xml file looks like this:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<ListView
android:id="#android:id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true" >
</ListView>
</RelativeLayout>
I think this is a simple mistake of me not fully understanding how the xml id value works in android.

Change the below
In OnCreate
setContentView(R.layout.activity_main);
lv = (ListView) findViewById(R.id.list);
Change listview in xml
<ListView
android:id="#+id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true" >
</ListView>

Try like below:
setContentView(R.layout.activity_main);
lv = (ListView) findViewById(R.id.ist);
and in xml change id of listview like below:
android:id="#+id/list"

Try this in the activity code file (java)
ListView lv = (ListView) findViewById(android.R.id.list);

In onCreate() you will find setContenctView(R.layout.activity_main); If not then you must add it. Make sure it is set to the xml activity you want to work with in the code java file. Then you can easily refer to the listView by using
lv = (ListView) findViewById(R.id.list);
Also the id in xml of a control is defined in the following form
<ListView
android:id="#+id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true" >
</ListView>

Two ListViews in one activity in android 3.0 and above

In Android 2.1 and 2.3 it works fine. But for 3.0 and above findViewById does not find the second ListView. I have already tried cleaning the project, tried not using ListActivity too, nothing helped. Any ideas?
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setListAdapter(List1Adaptor);
list1 = (ListView) findViewById(android.R.id.list);
list2 = (ListView) findViewById(R.id.ListView2);
list2.setAdapter(List2Adapter);//Null Pointer
}
the main.xml
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/linearLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ListView
android:id="#+id/ListView2"
android:layout_height="wrap_content"
android:layout_width="fill_parent" >
</ListView>
</LinearLayout>
<RelativeLayout
android:id="#+id/listLayout_relativeLayout2"
android:layout_height="320dp"
android:layout_width="fill_parent" >
<ListView
android:id="#android:id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
</ListView>
</RelativeLayout>

Your xml file is missing a root view. I'm surprised it works on any version of Android. You should surround everything with a linear layout or something like that.

Your layout has android:id="#+id/listView2" (note: lowercase 'l') and your Java code is requesting R.id.ListView2 (note: uppercase 'L'). Try using the same case in both situations.

android2.1 ListView reference

Hi i'm making a project and used a ListView in it. I've given it's code as
<ListView android:id="#android:id/android:list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
</ListView>
I would need to work with the above list and i'm unable to refer it with
findViewById(#android:id/android/list);
even "R.id" isn't working.
I should use a OnClickListener().
Thank you in advance...

the correct way is :
getViewById(android.R.id.list);

try this it is useful
<ListView
android:id="#+id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
</ListView>
and
findViewById(R.id.list);

Android: id list view

I have a list view declared in my xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:background="#F7EFE8">
<ListView android:id="#+id/android:list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
<TextView android:id="#+id/android:empty"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/no_message"/>
</LinearLayout>
But when I try to declare/use it to java, the id is not found. But when i rename the list view to something else and try to use it i can see it "R.id._" but when R.id.list I can't find it. And If I didn't use the android:list there's an error that there should be a list view whose id is android:list. Any help here?

Your ListView object id should be specified either as android:id="#android:id/list"
ListView lv = (ListView) findViewById(android.R.id.list);
or it should have some other id like android:id="#+id/sampleList"
ListView lv = (ListView) findViewById(R.id.sampleList);
Check this : ListActivity
and list
Hope this would help.

In xml layout use,
<ListView
android:id="#+id/list"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
In Java Code:
ListView listview=(ListView)findViewById(R.id.list);// it takes id of listview from xml
if you need to use android id for listview then replace your code as
<ListView
android:id="#+android:id/list"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
It may help you..

Try this: android:id="#+id/list"
Then clean project and rebuild.
In java, just call findViewById like this:
ListView lv = (ListView)findViewById(R.id.list);
Ref: http://developer.android.com/reference/android/view/View.html