Actually, no need for a stack trace. You are manually allocating an activity. This should never be done. It would be best to all the work in the activity allocated by the system. Of course you can delegate the work to a helper object like CPAddressbook, but you will need to pass the parent activity to it.
Cheers, Dmitri On Saturday, January 2, 2010, Dmitri Plotnikov <[email protected]> wrote: > Could you post the exception stack trace? > > Thank you, > Dmitri > > On Saturday, January 2, 2010, Flo <[email protected]> wrote: >> Hey there! >> >> I'm currently working on a component that's retrieving contact >> information and creating an RDF model (FOAF tbe) from the data >> provided. I started off with the HelloAndroid example and tried some >> code in there. Everything worked out fine, so I wanted to put >> everything in a seperate class which can be accessed via an interface. >> >> However, now I'm getting a NullPointer Exception when I want to call a >> managedQuery(). >> So I tried to create a ContentResolver in order to perform a query(). >> But as soon as I call the getContentResolver() I'm getting a >> NullPointer Exception as well. >> >> I think this could be a problem concerning the AndroidManifest.xml or >> lack of knowledge about how to handle Activities and the likes? I've >> been struggling with that for quite some hours now and think that I >> won't solve this on my own, so I'd like to get your opinions and >> ideas! >> >> However, here's my code: >> -------------------------------------------------------------------------- >> package com.example.helloandroid; >> >> import it.polimi.elet.contextaddict.microjena.rdf.model.Model; >> import it.polimi.elet.contextaddict.microjena.rdf.model.ModelFactory; >> import it.polimi.elet.contextaddict.microjena.rdf.model.Resource; >> import it.polimi.elet.contextaddict.microjena.vocabulary.RDF; >> import android.app.Activity; >> import android.database.Cursor; >> import android.net.Uri; >> import android.os.Bundle; >> import android.provider.ContactsContract; >> >> public class CPAddressbook extends Activity implements >> IBasicContextProvider { >> >> Model contextModel; >> >> public void onCreate(Bundle savedInstanceState) { >> super.onCreate(savedInstanceState); >> contextModel = ModelFactory.createDefaultModel(); >> } >> >> @Override >> public void detectContext(Model model) { >> >> Uri contactsURI = ContactsContract.Data.CONTENT_URI; >> >> String[] projection = new String[] { >> ContactsContract.Data._ID, >> ContactsContract.Data.CONTACT_ID, >> ContactsContract.Data.MIMETYPE, >> ContactsContract.Data.DATA1, >> ContactsContract.Data.DATA2, >> ContactsContract.Data.DATA3, >> ContactsContract.Data.DATA4, >> ContactsContract.Data.DATA5, >> ContactsContract.Data.DATA_VERSION >> }; >> String where = ContactsContract.Data.MIMETYPE + " = ? >> OR " + >> ContactsContract.Data.MIMETYPE + " = ? >> OR " + >> ContactsContract.Data.MIMETYPE + " = ? >> OR " + >> ContactsContract.Data.MIMETYPE + " = ?"; >> >> String[] whereArgs = new String[] { >> >> ContactsContract.CommonDataKinds.Email.CONTENT_ITEM_TYPE, >> >> ContactsContract.CommonDataKinds.Phone.CONTENT_ITEM_TYPE, >> >> ContactsContract.CommonDataKinds.StructuredName.CONTENT_ITEM_TYPE, >> >> ContactsContr -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
