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

I have created an xml file like this :

<?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="@+id/list" ></ListView>

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 I have the android:id="@+id/list" line in my xml.
What is the problem??

Rename the id of your ListView like this,

<ListView android:id="@android:id/list"    android:layout_width="fill_parent"    android:layout_height="fill_parent"/>

Since you are using ListActivity your xml file must specify the keywordandroid while mentioning to a ID.

If you need a custom ListView then instead of Extending a ListActivity, you have to simply extend anActivity and should have the same id without the keyword android.