Unable to get phone number from contact list... code inside

Question

Im new to android and programming in general (im a linux sys admin / scripting person). And Ive been trying to get a simple android app going to get a feel for programming but I am having some problems.

I was able to string together some ideas and queries to get a list view of all the contacts, but now id like to be able to grab the phone number of the selected contact but I am not having any luck... I know there is probably better ways to do what I am doing but Im just trying to get a grasp on this.

Code first:

package com.SomeApp;

import android.app.AlertDialog;
import android.app.ListActivity;
import android.database.Cursor;
//import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.view.View;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;

public class CallAppActivity extends ListActivity 
{  /** Called when the activity is first created. */
  private ListAdapter mAdapter;
  @Override
  public void onCreate(Bundle savedInstanceState) 
  { super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    //Get All information from ContactsContract
    Cursor managedCursor = getContentResolver().query(
      ContactsContract.Contacts.CONTENT_URI, 
      null, 
      null, 
      null, 
      null
    );

    //Activity will manage the cursor lifecycle.
    startManagingCursor(managedCursor);
    String[] columns = new String[] {ContactsContract.Contacts.DISPLAY_NAME};
    int[] names = new int[] {R.id.contact_entry};
    mAdapter = new SimpleCursorAdapter(
      this, 
      R.layout.main, 
      managedCursor, 
      columns, 
      names
   );
   setListAdapter(mAdapter);
  }

  @Override
  protected void onListItemClick(ListView l, View v, int position, long id) 
  { super.onListItemClick(l, v, position, id);

    Cursor lookup = (Cursor) mAdapter.getItem(position); 
    String contactId = lookup.getString(
      lookup.getColumnIndex(
        ContactsContract.Contacts._ID
      )
    );

    Cursor phone_num = getContentResolver().query(
      ContactsContract.CommonDataKinds.Phone.CONTENT_URI, 
      null, 
      ContactsContract.CommonDataKinds.Phone.CONTACT_ID +" = "+ contactId, 
      null, 
      null
    );

    String phoneId = phone_num.getString(
      phone_num.getColumnIndex(
        ContactsContract.CommonDataKinds.Phone.NUMBER
      )
    );

    //We are going to print shit to a message box....
    AlertDialog.Builder alertbox = new AlertDialog.Builder(this);
    alertbox.setMessage(phoneId);
    alertbox.show();
  }
}

And now the logcat....

07-23 11:35:34.469: WARN/dalvikvm(781): threadid=1: thread exiting with uncaught exception (group=0x40015560)
07-23 11:35:34.479: ERROR/AndroidRuntime(781): FATAL EXCEPTION: main
07-23 11:35:34.479: ERROR/AndroidRuntime(781): android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 1

No matter what Contact I pick I get the same exception, So I obviously am doing something wrong.. I just cant quite figure it out on my own :(

Any help appreciated.

Answer 1

Did you tried to make cursor pointer point to the first row to its data like cursor.moveToFirst() before you access data inside it? Actually, for Cursor phone_num and Cursor phone_id?