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

Question

I have created an xml file like this:

Answer 1

Rename the id of your ListView like this,

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.