Read Android contacts

ReadAndroidContacts.java

// The flow starts in onReadClick

import android.app.LoaderManager;
import android.content.CursorLoader;
import android.content.Loader;
import android.database.Cursor;
import android.provider.ContactsContract;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;


public class ContactsReaderActivity extends ActionBarActivity implements LoaderManager.LoaderCallbacks<Cursor> {

    private static final int CONTACTS_LOADER = 0;

    // Columns to read from the Contacts table
    private static final String[] CONTACTS_PROJECTION =
            {
                    ContactsContract.Contacts._ID,
                    ContactsContract.Contacts.LOOKUP_KEY,
                    ContactsContract.Contacts.DISPLAY_NAME_PRIMARY
            };

    // The indixes here must be aligned with the fields order in CONTACTS_PROJECTION
    private static final int CONTACT_ID = 0;
    private static final int CONTACT_LOOKUP_KEY = 1;
    private static final int CONTACT_DISPLAY_NAME = 2;

    // Columns to read from the Contacts Data table
    private static final String[] DATA_PROJECTION =
            {
                    ContactsContract.Data._ID,
                    ContactsContract.Data.MIMETYPE,
                    ContactsContract.Data.DATA1
            };

    // The indixes here must be aligned with the fields order in DATA_PROJECTION
    private static final int CONTACT_MIMETYPE = 1;
    private static final int CONTACT_DATA1 = 2;

    private static final String DATA_SELECTION =
            ContactsContract.Data.LOOKUP_KEY + " = ?" + " AND (" +
            ContactsContract.Data.MIMETYPE + " = '" + ContactsContract.CommonDataKinds.Email.CONTENT_ITEM_TYPE + "' OR " +
            ContactsContract.Data.MIMETYPE + " = '" + ContactsContract.CommonDataKinds.Phone.CONTENT_ITEM_TYPE + "')";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_manual_thief);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_manual_thief, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    public void onReadClick(View view) {
        getLoaderManager().initLoader(CONTACTS_LOADER, null, this);
    }

    @Override
    public Loader<Cursor> onCreateLoader(int id, Bundle args) {
        return new CursorLoader(
                this,
                ContactsContract.Contacts.CONTENT_URI,
                CONTACTS_PROJECTION,
                null, null, null
        );
    }

    @Override
    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
        while (data.moveToNext()) {
            long id = data.getLong(CONTACT_ID);
            String lookup_key = data.getString(CONTACT_LOOKUP_KEY);
            String display_name = data.getString(CONTACT_DISPLAY_NAME);
            String phone = "";
            String email = "";

            Cursor details = getContentResolver().query(
                    ContactsContract.Data.CONTENT_URI,
                    DATA_PROJECTION,
                    DATA_SELECTION,
                    new String[] {lookup_key},
                    null);
            while (details.moveToNext()) {
                String mime = details.getString(CONTACT_MIMETYPE);
                if (mime.equals(ContactsContract.CommonDataKinds.Phone.CONTENT_ITEM_TYPE)) {
                    phone = details.getString(CONTACT_DATA1);
                } else if (mime.equals(ContactsContract.CommonDataKinds.Email.CONTENT_ITEM_TYPE)) {
                    email = details.getString(CONTACT_DATA1);
                }
            }
            details.close();

            Log.i("ContactsReader", String.format("%d %s : %s %s", id, display_name, phone, email));
        }
    }

    @Override
    public void onLoaderReset(Loader<Cursor> loader) {
    }
}