How To Make Contentobserver Work Without Having Application Opened?

I need to have my application listen for changes in addressbook in Android. I have read that it can be done using ContentObserver and listening for changes in ContactsContract.Cont

Solution 1:

How do I make the ContentObserver work even if the application wasn't opened?

That is not possible. The point behind a ContentObserver is to be notified of changes that might affect a running app, such as changes to data that need to be reflected in an activity showing that data. If your app is not running, you cannot have a ContentObserver.

Solution 2:

register your Content Observer in the OnStartCommand with return START_STICKY; instead of registering it in the onCreate. It works for me.

@OverridepublicintonStartCommand(Intent intent, int flags, int startId) {  
    getContentResolver().registerContentObserver(uri,true, newSMSObserver(newHandler(), getBaseContext())); 
    return START_STICKY;    
}