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,
ContactsContract.CommonDataKinds.Im.CONTENT_ITEM_TYPE
};
Cursor contactsTable = managedQuery(contactsURI, projection,
where, whereArgs, null);
writeToContextModel(contactsTable);
}
...
--------------------------------------------------------------------------
This is the class that calls the detectContext():
--------------------------------------------------------------------------
package com.example.helloandroid;
import it.polimi.elet.contextaddict.microjena.rdf.model.Model;
import it.polimi.elet.contextaddict.microjena.rdf.model.ModelFactory;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.widget.TextView;
public class HelloAndroid extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
TextView tv = new TextView(this);
tv.setText("Hello Android!");
IBasicContextProvider cpAddressbook = new CPAddressbook();
cpAddressbook.detectContext(ModelFactory.createDefaultModel());
Model model = cpAddressbook.getContextModel();
setContentView(tv);
}
}
--------------------------------------------------------------------------
This is also where I had my query before. It was exactely the same
code!
and finally my AndroidManifest.xml:
--------------------------------------------------------------------------
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android";
package="com.example.helloandroid"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/
app_name">
<activity android:name=".HelloAndroid"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category
android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".CPAddressbook" android:label="@string/
app_name" android:permission="android.permission.READ_CONTACTS"></
activity>
</application>
<uses-sdk android:minSdkVersion="5" />
<uses-permission android:name="android.permission.READ_CONTACTS"></
uses-permission>
<uses-library android:name="it.polimi.elet.contextaddict.microjena"></
uses-library>
</manifest>
--------------------------------------------------------------------------
I tried it with and without the additional permission within
the .CPAddressbook and it didn't make any difference.
Is it about something in the AndroidManifest.xml or do I handle
Activities incorrectly? Or both?
Any help would be appreciated Smile
Thanks for your time!
--
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
