Projections in Contact Content Provider

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

<ListView
    android:id="@+id/list"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:stackFromBottom="false"
    android:transcriptMode="normal" />

<TextView
    android:id="@+id/contactName"
    android:textStyle="bold"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

<TextView
    android:id="@+id/contactID"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />

</LinearLayout>

package com.java2s.myapplication3.app;
//from ww  w. j  a v a  2 s .  c om
import android.app.ListActivity;
import android.content.CursorLoader;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.widget.CursorAdapter;
import android.widget.SimpleCursorAdapter;

public class MainActivity extends ListActivity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Uri allContacts = Uri.parse("content://contacts/people");

        String[] projection = new String[]
                {ContactsContract.Contacts._ID,
                        ContactsContract.Contacts.DISPLAY_NAME,
                        ContactsContract.Contacts.HAS_PHONE_NUMBER};

        Cursor c;
        if (android.os.Build.VERSION.SDK_INT < 11) {
            //before Honeycomb
            c = managedQuery(allContacts, projection, null, null, null);
        } else {
            //Honeycomb and later
            CursorLoader cursorLoader = new CursorLoader(
                    this,
                    allContacts,
                    projection,
                    null,
                    null,
                    null);
            c = cursorLoader.loadInBackground();
        }


        String[] columns = new String[]{
                ContactsContract.Contacts.DISPLAY_NAME,
                ContactsContract.Contacts._ID};

        int[] views = new int[]{R.id.contactName, R.id.contactID};

        SimpleCursorAdapter adapter;

        if (android.os.Build.VERSION.SDK_INT < 11) {
            //before Honeycomb
            adapter = new SimpleCursorAdapter(
                    this, R.layout.activity_main, c, columns, views);
        } else {
            //Honeycomb and later
            adapter = new SimpleCursorAdapter(
                    this, R.layout.activity_main, c, columns, views,
                    CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
        }

        this.setListAdapter(adapter);
    }

    private void PrintContacts(Cursor c) {
        if (c.moveToFirst()) {
            do {
                String contactID = c.getString(c.getColumnIndex(
                        ContactsContract.Contacts._ID));
                String contactDisplayName =
                        c.getString(c.getColumnIndex(
                                ContactsContract.Contacts.DISPLAY_NAME));

            } while (c.moveToNext());
        }
    }

}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.java2s.Provider"
     android:versionCode="1"
     android:versionName="1.0" >

     <uses-sdk android:minSdkVersion="14" />
     <uses-permission android:name="android.permission.READ_CONTACTS"/>

     <application
       android:icon="@drawable/ic_launcher"
       android:label="@string/app_name" >
       <activity
           android:label="@string/app_name"
           android:name=".ProviderActivity" >
           <intent-filter >
               <action android:name="android.intent.action.MAIN" />

               <category android:name="android.intent.category.LAUNCHER" />
           </intent-filter>
       </activity>
   </application>
</manifest>