Android notify when phone book is updated(Content Observer)

Question

I want to get a notification on my phone if there is any change in the contact database(add,delete).Right now i am using ContentObserver to get notified.Following is my code.Problem is that i able not able to know which contact is changed.Can anyone help???

public class ContentObserverActivity extends Activity {
    Button registerbutton;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        registerbutton=(Button)findViewById(R.id.button1);
        registerbutton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
            getContentResolver()
                .registerContentObserver(
                        ContactsContract.Contacts.CONTENT_URI, true,
                        new MyCOntentObserver());   
            }
        });
    }


    public class MyCOntentObserver extends ContentObserver{
        public MyCOntentObserver() {
            super(null);
        }
        @Override
        public void onChange(boolean selfChange) {
        super.onChange(selfChange);
            Log.e("","~~~~~~"+selfChange);
        }  

        @Override
        public boolean deliverSelfNotifications() {
            return true;
        }
    }
}

Thanks in advance.

Answer 1

Observer does not provide the information that which contact is added/update/deleted. To get to know this save the contacts in your own DB table and when observer send the change notification check it with system's Contacts.