Fixes to "Retrieving a List of Contacts" Android tutorial by Google: https://developer.android.com/training/contacts-provider/retrieve-names.html

ContactsFragment.java

// Fixes to compilation errors in "Define the onItemClick() method" section

// Doesn't compile
Cursor cursor = parent.getAdapter().getCursor();
// Fixed (not sure if this is the cleanest way though)
Cursor cursor = ((SimpleCursorAdapter) parent.getAdapter()).getCursor();

// Doesn't compile
mContactId = getLong(CONTACT_ID_INDEX);
// Fixed
mContactId = cursor.getLong(CONTACT_ID_INDEX);
     
// Doesn't compile
mContactKey = getString(CONTACT_KEY_INDEX);
// Fixed. Note that the constant defined earlier in the tutorial is LOOKUP_KEY_INDEX
mContactKey = cursor.getString(LOOKUP_KEY_INDEX);

Hi there,

I'm getting an error trying to get the ListView object.

contactsList = (ListView) getActivity().findViewById(R.id.list); ... contactsList.setAdapter(cursorAdapter);

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference

Do I need to use setContentView() method ?

Hi there,

I'm getting an error trying to get the ListView object.

contactsList = (ListView) getActivity().findViewById(R.id.list); ... contactsList.setAdapter(cursorAdapter);

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference

Do I need to use setContentView() method ?

Try SO answer