Query Contacts database, display in ListView.

The exercise "Query Contacts database" display result in TextView. It's modified to display in ListView.

Modify layout to have a ListView.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" 
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />
    <ListView 
        android:id="@+id/conactlist"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>

package com.example.androidquerycontacts;

import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.support.v4.content.CursorLoader;
import android.support.v4.widget.CursorAdapter;
import android.support.v4.widget.SimpleCursorAdapter;
import android.app.Activity;
import android.database.Cursor;
import android.widget.ListAdapter;
import android.widget.ListView;

public class MainActivity extends Activity {
 
 ListView listContacts;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  listContacts = (ListView)findViewById(R.id.conactlist);
  
  Uri queryUri = ContactsContract.Contacts.CONTENT_URI;

  String[] projection = new String[] {
    ContactsContract.Contacts._ID,
    ContactsContract.Contacts.DISPLAY_NAME};
  
  String selection = ContactsContract.Contacts.DISPLAY_NAME + " IS NOT NULL";
  
  CursorLoader cursorLoader = new CursorLoader(
            this, 
            queryUri, 
            projection, 
            selection, 
            null, 
            null);
  
  Cursor cursor = cursorLoader.loadInBackground();
  
  String[] from = {ContactsContract.Contacts.DISPLAY_NAME};
        int[] to = {android.R.id.text1};
        
        ListAdapter adapter = new SimpleCursorAdapter(
                this, 
                android.R.layout.simple_list_item_1, 
                cursor, 
                from, 
                to, 
                CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
        listContacts.setAdapter(adapter);
 }

}

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Compare with:
- List images in MediaStore.Images.Media

Next:
- Handle Item Click on Query Contacts database ListView