Oh, now I see what you meant by "passing the parent activity".. no
idea, why I didn't understand it first, guess I shouldn't program more
than 6h without a break :D
However, if anyone comes across the same problem as I did, just pass
the activity to the class constructor like this:
public class CPAddressbook implements IBasicContextProvider {
Activity callingActivity;
public CPAddressbook(Activity caller) {
callingActivity = caller;
}
//so you can query like that:
Cursor c = callingActivity.managedQuery(contactsURI, projection,
where, whereArgs, orderBy);
}
Thanks a lot for your help Dmitri!! :)
On Jan 3, 11:46 am, Flo <flo.schw...@gmail.com> wrote:
> Okay, so my suspicion was right!
>
> How can I achieve passing the parent activity to it?
> Does this involve Intents? Or should the CPAddressbook simply extend
> the parent activity?
>
> Thanks for your help so far,
> Flo.
>
> On 3 Jan., 02:17, Dmitri Plotnikov <dplotni...@google.com> wrote:
>
> > 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 <dplotni...@google.com>
> > wrote:
> > > Could you post the exception stack trace?
>
> > > Thank you,
> > > Dmitri
>
> > > On Saturday, January 2, 2010, Flo <flo.schw...@gmail.com> 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
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