Question

I was trying to get the contacts using a query through the ContactsContract
The following code throws an exception.
java.lang.ClassCastException.

public class ContactManager extends Activity{

    ArrayList<String> contactsList = new ArrayList<String>();
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        String[] contacts = getContactNames();
    }

        public String[] getContactNames(){
            try{
        Cursor cursor = getContentResolver().query(ContactsContract.Contacts.CONTENT_URI,
                null, null, null, null);


        while (cursor.moveToNext()) { 

              contactsList.add(cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME)));
        }
        return (String []) contactsList.toArray();

        }
        catch(Exception e){
            Log.e("WOw", e.toString());
            return null;
    }
        }
        }

Any idea?
I did not forget to add the permission

Answer 1

The method toArray() returns an array of Object and it cannot be cast to an array of String.

You have to provide an argument to the method to specify the type :

return (String[]) contactsList.toArray(new String[contactsList.size()]);

You will find more details in the documentation.