ContactSelector.java

package com.novoda;

import android.app.Activity;
import android.content.CursorLoader;
import android.content.Intent;
import android.content.Loader;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.Contacts.People;
import android.provider.ContactsContract;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class ContactSelector extends Activity {
    private static final int PICK_CONTACT = 1;
    private static final int LOADER_ID_CONTACT = 1;
    private Button btnContacts;
    private TextView txtContacts;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        btnContacts = (Button) findViewById(R.id.btn_contacts);
        txtContacts = (TextView) findViewById(R.id.txt_contacts);

        btnContacts.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                Intent intent = new Intent(Intent.ACTION_PICK, People.CONTENT_URI);
                startActivityForResult(intent, PICK_CONTACT);
            }
        });
    }

    @Override
    public void onActivityResult(int reqCode, int resultCode, Intent data) {
        super.onActivityResult(reqCode, resultCode, data);

        switch (reqCode) {
            case (PICK_CONTACT):
                if (resultCode == Activity.RESULT_OK) {
                    Uri contactData = data.getData();
                    CursorLoader loader = new CursorLoader(this, contactData, null, null, null, null);
                    loader.registerListener(LOADER_ID_CONTACT, new Loader.OnLoadCompleteListener<Cursor>() {
                        @Override
                        public void onLoadComplete(final Loader<Cursor> loader, final Cursor data) {
                            if (data.moveToFirst()) {
                                int nameColumnIndex = data.getColumnIndexOrThrow(ContactsContract.Contacts.DISPLAY_NAME_PRIMARY);
                                String name = data.getString(nameColumnIndex);
                                txtContacts.setText(name);
                            }
                        }
                    });
                    loader.startLoading();
                }
                break;
        }
    }
}