Your content must have a ListView whose id attribute is android R id list

Question

I have created an xml file like this    lt  xml version  1 0  encoding  utf-8   gt   lt ListView xmlns android  http   schemas android com apk res android      android layout width  match parent      android layout height  match parent      android id    id list   gt   lt  ListView gt    and an activity   public class ExampleActivity extends ListActivity           Called when the activity is first created          Override     public void onCreate Bundle savedInstanceState               super onCreate savedInstanceState           setContentView R layout mainlist             As you see  I have not done anything else  But I am getting the error      Your content must have a ListView whose id attribute is  android R id list    Even though I have the android id    id list  line in my xml    What is the problem

User · Answer

Exact way I fixed this based on feedback above since I couldn't get it to work at first:

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@android:id/list"
>
</ListView>

MainActivity.java:

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

preferences.xml:

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
<PreferenceCategory
    android:key="upgradecategory"
    android:title="Upgrade" >
    <Preference
        android:key="download"
        android:title="Get OnCall Pager Pro"
        android:summary="Touch to download the Pro Version!" />
</PreferenceCategory>
</PreferenceScreen>

User · Answer

Rename the id of your ListView like this     lt ListView android id   android id list      android layout width  fill parent      android layout height  fill parent   gt    Since you are using ListActivity your xml file must specify the keyword android while mentioning to a ID    If you need a custom ListView then instead of Extending a ListActivity  you have to simply extend an Activity and should have the same id without the keyword android

User · Answer

lt ListView android id   android id list      android layout width  fill parent      android layout height  fill parent   gt    this should solve your problem

User · Answer

One other thing that affected me  If you have multiple test devices  make sure you are making changes to the layout used by the device  In my case  I spent a while making changes to xmls in the  layout  directory until I discovered that my larger phone  which I switched to halfway through testing  was using xmls in the  layout-sw360dp  directory  Grrr

User · Answer

You should have one listview in your mainlist xml file with id as  android id list   lt ListView     android id   android id list      android layout height  wrap content      android layout height  fill parent   gt

User · Answer

Inherit Activity Class instead of ListActivity you can resolve this problem    public class ExampleActivity extends Activity          Override     public void onCreate Bundle savedInstanceState             super onCreate savedInstanceState            setContentView R layout mainlist

User · Answer

lt ListView android id   id android list          android layout width  fill parent          android layout height  wrap content          android drawSelectorOnTop  false          android scrollbars  vertical   gt

[android] Your content must have a ListView whose id attribute is 'android.R.id.list'

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