How to add a new contact programmatically in android?

We all know how to add a new contact to our android devices without programming right.
OK that’s a normal man’s use.
But what from a programmer’s view.

import java.util.ArrayList;

import android.app.Activity;

import android.content.ContentProviderOperation;

import android.content.ContentValues;

import android.net.Uri;

import android.os.Bundle;

import android.provider.ContactsContract;

import android.provider.Contacts.People;

import android.provider.ContactsContract.CommonDataKinds.Phone;

import android.widget.Toast;

public class AddContactDemo extends Activity {

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        addContact("Hardik","1234567890");

        addContact("Alex","5656215521");

        addContact("Kenedy","4545454545");

        addContact("Peter","9632587410");

        addContact("John","4561237890");

    }

   private void addContact(String name, String phone) {

        ContentValues values = new ContentValues();

        values.put(People.NUMBER, phone);

        values.put(People.TYPE, Phone.TYPE_CUSTOM);

        values.put(People.LABEL, name);

        values.put(People.NAME, name);

        Uri dataUri = getContentResolver().insert(People.CONTENT_URI, values);

        Uri updateUri = Uri.withAppendedPath(dataUri, People.Phones.CONTENT_DIRECTORY);

        values.clear();

        values.put(People.Phones.TYPE, People.TYPE_MOBILE);

        values.put(People.NUMBER, phone);

        updateUri = getContentResolver().insert(updateUri, values);

      }

}