Custom Contact Manager Android

Quiero un listado de contactos en 2 columnas, hecho de la manera más simple posible. 

En principio solo mostraremos los nombres de los contactos, luego imagenes, abrir dialer, etc.

 Main.java

package b.android;

import java.util.ArrayList;

import java.util.HashMap;

import android.app.Activity;

import android.database.Cursor;

import android.net.Uri;

import android.os.Bundle;

import android.provider.ContactsContract;

import android.widget.GridView;

import android.widget.SimpleCursorAdapter;

public class Main extends Activity {

 static final ArrayList<HashMap<String, String>> list = new ArrayList<HashMap<String, String>>();

 String[] projection = new String[] { ContactsContract.Data.DISPLAY_NAME,

 ContactsContract.Data._ID };

 @Override

 public void onCreate(Bundle icicle) {

 super.onCreate(icicle);

 setContentView(R.layout.main);

 populateContactList();

 }

 private void populateContactList() {

 // Build adapter with contact entries

 Cursor cursor = getContacts();

 SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,

 R.layout.contact, cursor, projection,

 new int[] { R.id.contactName });

 GridView gridview = (GridView) findViewById(R.id.gridview);

 gridview.setAdapter(adapter);

 }

 private Cursor getContacts() {

 // Run query

 Uri uri = ContactsContract.Contacts.CONTENT_URI;

 String sortOrder = ContactsContract.Data.DISPLAY_NAME

 + " COLLATE LOCALIZED ASC";

 return managedQuery(uri, projection, null, null, sortOrder);

 }

}

Contacto Individual

 contact.xml 

 <?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="wrap_content"

 android:orientation="horizontal">

 <TextView android:id="@+id/contactName" android:textSize="12sp"

 android:textStyle="bold" android:layout_width="fill_parent"

 android:layout_height="fill_parent" />

</LinearLayout>

Listado

 main.xml  

<?xml version="1.0" encoding="utf-8"?>

<GridView xmlns:android="http://schemas.android.com/apk/res/android" 

    android:id="@+id/gridview"

    android:layout_width="fill_parent" 

    android:layout_height="fill_parent"

    android:numColumns="auto_fit"

    android:verticalSpacing="10dp"

    android:horizontalSpacing="10dp"

    android:columnWidth="130dp"

    android:stretchMode="columnWidth"

    android:gravity="center"

/>

Seteamos el Main, y los permisos de lectura a contactos

 AndroidManifest.xml  

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

      package="b.android"

      android:versionCode="1"

      android:versionName="1.0">

    <application android:icon="@drawable/icon" android:label="@string/app_name">

        <activity android:name=".Main"

                  android:label="@string/app_name">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

    

    <uses-permission android:name="android.permission.GET_ACCOUNTS" />

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

    <uses-permission android:name="android.permission.WRITE_CONTACTS" />

</manifest>