************************************************************************
ItemDivider.java
************************************************************************
// ItemDivider.java
// Class that defines dividers displayed between the RecyclerView items;
// based on Google's sample implementation at bit.ly/DividerItemDecoration
package at.htl.addressbook;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.RecyclerView;
import android.view.View;

class ItemDivider extends RecyclerView.ItemDecoration {
   private final Drawable divider;

   // constructor loads built-in Android list item divider
   public ItemDivider(Context context) {
      int[] attrs = {android.R.attr.listDivider};
      divider = context.obtainStyledAttributes(attrs).getDrawable(0);
   }

   // draws the list item dividers onto the RecyclerView
   @Override
   public void onDrawOver(Canvas c, RecyclerView parent,
      RecyclerView.State state) {
      super.onDrawOver(c, parent, state);

      // calculate left/right x-coordinates for all dividers
      int left = parent.getPaddingLeft();
      int right = parent.getWidth() - parent.getPaddingRight();

      // for every item but the last, draw a line below it
      for (int i = 0; i < parent.getChildCount() - 1; ++i) {
         View item = parent.getChildAt(i); // get ith list item

         // calculate top/bottom y-coordinates for current divider
         int top = item.getBottom() + ((RecyclerView.LayoutParams)
            item.getLayoutParams()).bottomMargin;
         int bottom = top + divider.getIntrinsicHeight();

         // draw the divider with the calculated bounds
         divider.setBounds(left, top, right, bottom);
         divider.draw(c);
      }
   }
}





************************************************************************
strings.xml
************************************************************************
<resources>
   <string name="app_name">AddressBook</string>
   <string name="menuitem_edit">Edit</string>
   <string name="menuitem_delete">Delete</string>
   <string name="hint_name_required">Name (Required)</string>
   <string name="hint_email">E-Mail</string>
   <string name="hint_phone">Phone</string>
   <string name="hint_street">Street</string>
   <string name="hint_city">City</string>
   <string name="hint_state">State</string>
   <string name="hint_zip">Zip</string>
   <string name="label_name">Name:</string>
   <string name="label_email">E-Mail:</string>
   <string name="label_phone">Phone:</string>
   <string name="label_street">Street:</string>
   <string name="label_city">City:</string>
   <string name="label_state">State:</string>
   <string name="label_zip">Zip:</string>
   <string name="confirm_title">Are You Sure?</string>
   <string name="confirm_message">This will permanently delete the contact</string>
   <string name="button_cancel">Cancel</string>
   <string name="button_delete">Delete</string>
   <string name="contact_added">Contact added successfully</string>
   <string name="contact_not_added">Contact was not added due to an error</string>
   <string name="contact_updated">Contact updated</string>
   <string name="contact_not_updated">Contact was not updated due to an error</string>
   <string name="invalid_query_uri">Invalid query Uri: </string>
   <string name="invalid_insert_uri">Invalid insert Uri: </string>
   <string name="invalid_update_uri">Invalid update Uri: </string>
   <string name="invalid_delete_uri">Invalid delete Uri: </string>
   <string name="insert_failed">Insert failed:</string>
</resources>






************************************************************************
content_main.xml for tablets (!)
************************************************************************
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
   xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:baselineAligned="false"
   android:divider="?android:listDivider"
   android:orientation="horizontal"
   android:paddingBottom="@dimen/activity_vertical_margin"
   android:paddingLeft="@dimen/activity_horizontal_margin"
   android:paddingRight="@dimen/activity_horizontal_margin"
   android:paddingTop="@dimen/activity_vertical_margin"
   android:showDividers="middle"
   android:weightSum="3"
   app:layout_behavior="@string/appbar_scrolling_view_behavior">

   <fragment
      android:id="@+id/contactsFragment"
      android:name="at.htl.addressbook.ContactsFragment"
      android:layout_width="0dp"
      android:layout_height="match_parent"
      android:layout_marginEnd="@dimen/divider_margin"
      android:layout_weight="1"
      tools:layout="@layout/fragment_contacts"/>

   <FrameLayout
      android:id="@+id/rightPaneContainer"
      android:layout_width="0dp"
      android:layout_height="match_parent"
      android:layout_marginStart="@dimen/divider_margin"
      android:layout_weight="2"/>
</LinearLayout>





************************************************************************
fragment_details.xml
************************************************************************
<ScrollView android:id="@+id/detailsScrollView"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <GridLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:columnCount="2"
        android:useDefaultMargins="true">

        <TextView
            android:id="@+id/nameLabelTextView"
            style="@style/ContactLabelTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="0"
            android:layout_row="0"
            android:text="@string/label_name"/>

        <TextView
            android:id="@+id/nameTextView"
            style="@style/ContactTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="1"
            android:layout_row="0"/>

        <TextView
            android:id="@+id/phoneLabelTextView"
            style="@style/ContactLabelTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="0"
            android:layout_row="1"
            android:text="@string/label_phone"/>

        <TextView
            android:id="@+id/phoneTextView"
            style="@style/ContactTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="1"
            android:layout_row="1"/>

        <TextView
            android:id="@+id/emailLabelTextView"
            style="@style/ContactLabelTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="0"
            android:layout_row="2"
            android:text="@string/label_email"/>

        <TextView
            android:id="@+id/emailTextView"
            style="@style/ContactTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="1"
            android:layout_row="2"/>

        <TextView
            android:id="@+id/streetLabelTextView"
            style="@style/ContactLabelTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="0"
            android:layout_row="3"
            android:text="@string/label_street"/>

        <TextView
            android:id="@+id/streetTextView"
            style="@style/ContactTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="1"
            android:layout_row="3"/>

        <TextView
            android:id="@+id/cityLabelTextView"
            style="@style/ContactLabelTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="0"
            android:layout_row="4"
            android:text="@string/label_city"/>

        <TextView
            android:id="@+id/cityTextView"
            style="@style/ContactTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="1"
            android:layout_row="4"/>

        <TextView
            android:id="@+id/stateLabelTextView"
            style="@style/ContactLabelTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="0"
            android:layout_row="5"
            android:text="@string/label_state"/>

        <TextView
            android:id="@+id/stateTextView"
            style="@style/ContactTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="1"
            android:layout_row="5"/>

        <TextView
            android:id="@+id/zipLabelTextView"
            style="@style/ContactLabelTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="0"
            android:layout_row="6"
            android:text="@string/label_zip"/>

        <TextView
            android:id="@+id/zipTextView"
            style="@style/ContactTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="1"
            android:layout_row="6"/>
    </GridLayout>
</ScrollView>





************************************************************************
fragment_details_menu.xml
************************************************************************
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto">

   <item
      android:id="@+id/action_edit"
      android:icon="@drawable/ic_mode_edit_24dp"
      android:orderInCategory="1"
      android:title="@string/menuitem_edit"
      app:showAsAction="always"/>

   <item
      android:id="@+id/action_delete"
      android:icon="@drawable/ic_delete_24dp"
      android:orderInCategory="2"
      android:title="@string/menuitem_delete"
      app:showAsAction="always"/>
</menu>





************************************************************************
DatabaseDescription.java
************************************************************************
// DatabaseDescription.java
// Describes the table name and column names for this app's database,
// and other information required by the ContentProvider
package at.htl.addressbook.data;

import android.content.ContentUris;
import android.net.Uri;
import android.provider.BaseColumns;

public class DatabaseDescription {
   // ContentProvider's name: typically the package name
   public static final String AUTHORITY =
      "at.htl.addressbook.data";

   // base URI used to interact with the ContentProvider
   private static final Uri BASE_CONTENT_URI =
      Uri.parse("content://" + AUTHORITY);

   // nested class defines contents of the contacts table
   public static final class Contact implements BaseColumns {
      public static final String TABLE_NAME = "contacts"; // table's name

      // Uri for the contacts table
      public static final Uri CONTENT_URI =
         BASE_CONTENT_URI.buildUpon().appendPath(TABLE_NAME).build();

      // column names for contacts table's columns
      public static final String COLUMN_NAME = "name";
      public static final String COLUMN_PHONE = "phone";
      public static final String COLUMN_EMAIL = "email";
      public static final String COLUMN_STREET = "street";
      public static final String COLUMN_CITY = "city";
      public static final String COLUMN_STATE = "state";
      public static final String COLUMN_ZIP = "zip";

      // creates a Uri for a specific contact
      public static Uri buildContactUri(long id) {
         return ContentUris.withAppendedId(CONTENT_URI, id);
      }
   }
}






************************************************************************
AddEditFragment.java
************************************************************************
// Fragment for adding a new contact or editing an existing one
package at.htl.addressbook;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.support.design.widget.CoordinatorLayout;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.design.widget.TextInputLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.inputmethod.InputMethodManager;

import at.htl.addressbook.data.DatabaseDescription;

import static at.htl.addressbook.data.DatabaseDescription.*;

public class AddEditFragment extends Fragment
        implements LoaderManager.LoaderCallbacks<Cursor> {

    // defines callback method implemented by MainActivity
    public interface AddEditFragmentListener {
        // called when contact is saved
        void onAddEditCompleted(Uri contactUri);
    }

    // constant used to identify the Loader
    private static final int CONTACT_LOADER = 0;

    private AddEditFragmentListener listener; // MainActivity
    private Uri contactUri; // Uri of selected contact
    private boolean addingNewContact = true; // adding (true) or editing

    // EditTexts for contact information
    private TextInputLayout nameTextInputLayout;
    private TextInputLayout phoneTextInputLayout;
    private TextInputLayout emailTextInputLayout;
    private TextInputLayout streetTextInputLayout;
    private TextInputLayout cityTextInputLayout;
    private TextInputLayout stateTextInputLayout;
    private TextInputLayout zipTextInputLayout;
    private FloatingActionButton saveContactFAB;

    private CoordinatorLayout coordinatorLayout; // used with SnackBars

    // set AddEditFragmentListener when Fragment attached
    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        listener = (AddEditFragmentListener) context;
    }

    // remove AddEditFragmentListener when Fragment detached
    @Override
    public void onDetach() {
        super.onDetach();
        listener = null;
    }

    // called when Fragment's view needs to be created
    @Override
    public View onCreateView(
            LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        super.onCreateView(inflater, container, savedInstanceState);
        setHasOptionsMenu(true); // fragment has menu items to display

        // inflate GUI and get references to EditTexts
        View view =
                inflater.inflate(R.layout.fragment_add_edit, container, false);
        nameTextInputLayout =
                (TextInputLayout) view.findViewById(R.id.nameTextInputLayout);
        nameTextInputLayout.getEditText().addTextChangedListener(
                nameChangedListener);
        phoneTextInputLayout =
                (TextInputLayout) view.findViewById(R.id.phoneTextInputLayout);
        emailTextInputLayout =
                (TextInputLayout) view.findViewById(R.id.emailTextInputLayout);
        streetTextInputLayout =
                (TextInputLayout) view.findViewById(R.id.streetTextInputLayout);
        cityTextInputLayout =
                (TextInputLayout) view.findViewById(R.id.cityTextInputLayout);
        stateTextInputLayout =
                (TextInputLayout) view.findViewById(R.id.stateTextInputLayout);
        zipTextInputLayout =
                (TextInputLayout) view.findViewById(R.id.zipTextInputLayout);

        // set FloatingActionButton's event listener
        saveContactFAB = (FloatingActionButton) view.findViewById(
                R.id.saveFloatingActionButton);
        saveContactFAB.setOnClickListener(saveContactButtonClicked);
        updateSaveButtonFAB();

        // used to display SnackBars with brief messages
        coordinatorLayout = (CoordinatorLayout) getActivity().findViewById(
                R.id.coordinatorLayout);

        Bundle arguments = getArguments(); // null if creating new contact

        if (arguments != null) {
            addingNewContact = false;
            contactUri = arguments.getParcelable(MainActivity.CONTACT_URI);
        }

        // if editing an existing contact, create Loader to get the contact
        if (contactUri != null) {
            getLoaderManager().initLoader(CONTACT_LOADER, null, this);
        }
        return view;
    }

    // detects when the text in the nameTextInputLayout's EditText changes
    // to hide or show saveButtonFAB
    private final TextWatcher nameChangedListener = new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                                      int after) {}

        // called when the text in nameTextInputLayout changes
        @Override
        public void onTextChanged(CharSequence s, int start, int before,
                                  int count) {
            updateSaveButtonFAB();
        }

        @Override
        public void afterTextChanged(Editable s) { }
    };

    // shows saveButtonFAB only if the name is not empty
    private void updateSaveButtonFAB() {
        String input =
                nameTextInputLayout.getEditText().getText().toString();

        // if there is a name for the contact, show the FloatingActionButton
        if (input.trim().length() != 0) {
            saveContactFAB.show();
        } else {
            saveContactFAB.hide();
        }
    }

    // responds to event generated when user saves a contact
    private final View.OnClickListener saveContactButtonClicked =
            new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    // hide the virtual keyboard
                    ((InputMethodManager) getActivity().getSystemService(
                            Context.INPUT_METHOD_SERVICE)).hideSoftInputFromWindow(
                            getView().getWindowToken(), 0);
                    saveContact(); // save contact to the database
                }
            };

    // saves contact information to the database
    private void saveContact() {
        // create ContentValues object containing contact's key-value pairs
        ContentValues contentValues = new ContentValues();
        contentValues.put(Contact.COLUMN_NAME,
                nameTextInputLayout.getEditText().getText().toString());
        contentValues.put(Contact.COLUMN_PHONE,
                phoneTextInputLayout.getEditText().getText().toString());
        contentValues.put(Contact.COLUMN_EMAIL,
                emailTextInputLayout.getEditText().getText().toString());
        contentValues.put(Contact.COLUMN_STREET,
                streetTextInputLayout.getEditText().getText().toString());
        contentValues.put(Contact.COLUMN_CITY,
                cityTextInputLayout.getEditText().getText().toString());
        contentValues.put(Contact.COLUMN_STATE,
                stateTextInputLayout.getEditText().getText().toString());
        contentValues.put(Contact.COLUMN_ZIP,
                zipTextInputLayout.getEditText().getText().toString());

        if (addingNewContact) {
            // use Activity's ContentResolver to invoke
            // insert on the AddressBookContentProvider
            Uri newContactUri = getActivity().getContentResolver().insert(
                    Contact.CONTENT_URI, contentValues);

            if (newContactUri != null) {
                Snackbar.make(coordinatorLayout,
                        R.string.contact_added, Snackbar.LENGTH_LONG).show();
                listener.onAddEditCompleted(newContactUri);
            }
            else {
                Snackbar.make(coordinatorLayout,
                        R.string.contact_not_added, Snackbar.LENGTH_LONG).show();
            }
        }
        else {
            // use Activity's ContentResolver to invoke
            // insert on the AddressBookContentProvider
            int updatedRows = getActivity().getContentResolver().update(
                    contactUri, contentValues, null, null);

            if (updatedRows > 0) {
                listener.onAddEditCompleted(contactUri);
                Snackbar.make(coordinatorLayout,
                        R.string.contact_updated, Snackbar.LENGTH_LONG).show();
            }
            else {
                Snackbar.make(coordinatorLayout,
                        R.string.contact_not_updated, Snackbar.LENGTH_LONG).show();
            }
        }
    }

    // called by LoaderManager to create a Loader
    @Override
    public Loader<Cursor> onCreateLoader(int id, Bundle args) {
        // create an appropriate CursorLoader based on the id argument;
        // only one Loader in this fragment, so the switch is unnecessary
        switch (id) {
            case CONTACT_LOADER:
                return new CursorLoader(getActivity(),
                        contactUri, // Uri of contact to display
                        null, // null projection returns all columns
                        null, // null selection returns all rows
                        null, // no selection arguments
                        null); // sort order
            default:
                return null;
        }
    }

    // called by LoaderManager when loading completes
    @Override
    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
        // if the contact exists in the database, display its data
        if (data != null && data.moveToFirst()) {
            // get the column index for each data item
            int nameIndex = data.getColumnIndex(Contact.COLUMN_NAME);
            int phoneIndex = data.getColumnIndex(Contact.COLUMN_PHONE);
            int emailIndex = data.getColumnIndex(Contact.COLUMN_EMAIL);
            int streetIndex = data.getColumnIndex(Contact.COLUMN_STREET);
            int cityIndex = data.getColumnIndex(Contact.COLUMN_CITY);
            int stateIndex = data.getColumnIndex(Contact.COLUMN_STATE);
            int zipIndex = data.getColumnIndex(Contact.COLUMN_ZIP);

            // fill EditTexts with the retrieved data
            nameTextInputLayout.getEditText().setText(
                    data.getString(nameIndex));
            phoneTextInputLayout.getEditText().setText(
                    data.getString(phoneIndex));
            emailTextInputLayout.getEditText().setText(
                    data.getString(emailIndex));
            streetTextInputLayout.getEditText().setText(
                    data.getString(streetIndex));
            cityTextInputLayout.getEditText().setText(
                    data.getString(cityIndex));
            stateTextInputLayout.getEditText().setText(
                    data.getString(stateIndex));
            zipTextInputLayout.getEditText().setText(
                    data.getString(zipIndex));

            updateSaveButtonFAB();
        }
    }

    // called by LoaderManager when the Loader is being reset
    @Override
    public void onLoaderReset(Loader<Cursor> loader) { }
}







************************************************************************
DetailFragment.java
************************************************************************
// Fragment subclass that displays one contact's details
package at.htl.addressbook;

import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.Fragment;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.support.v7.app.AlertDialog;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import at.htl.addressbook.data.DatabaseDescription;

import static at.htl.addressbook.data.DatabaseDescription.*;

public class DetailFragment extends Fragment
        implements LoaderManager.LoaderCallbacks<Cursor> {

    // callback methods implemented by MainActivity
    public interface DetailFragmentListener {
        void onContactDeleted(); // called when a contact is deleted

        // pass Uri of contact to edit to the DetailFragmentListener
        void onEditContact(Uri contactUri);
    }

    private static final int CONTACT_LOADER = 0; // identifies the Loader

    private DetailFragmentListener listener; // MainActivity
    private Uri contactUri; // Uri of selected contact

    private TextView nameTextView; // displays contact's name
    private TextView phoneTextView; // displays contact's phone
    private TextView emailTextView; // displays contact's email
    private TextView streetTextView; // displays contact's street
    private TextView cityTextView; // displays contact's city
    private TextView stateTextView; // displays contact's state
    private TextView zipTextView; // displays contact's zip

    // set DetailFragmentListener when fragment attached
    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        listener = (DetailFragmentListener) context;
    }

    // remove DetailFragmentListener when fragment detached
    @Override
    public void onDetach() {
        super.onDetach();
        listener = null;
    }

    // called when DetailFragmentListener's view needs to be created
    @Override
    public View onCreateView(
            LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        super.onCreateView(inflater, container, savedInstanceState);
        setHasOptionsMenu(true); // this fragment has menu items to display

        // get Bundle of arguments then extract the contact's Uri
        Bundle arguments = getArguments();

        if (arguments != null) {
            contactUri = arguments.getParcelable(MainActivity.CONTACT_URI);
        }

        // inflate DetailFragment's layout
        View view =
                inflater.inflate(R.layout.fragment_detail, container, false);

        // get the EditTexts
        nameTextView = (TextView) view.findViewById(R.id.nameTextView);
        phoneTextView = (TextView) view.findViewById(R.id.phoneTextView);
        emailTextView = (TextView) view.findViewById(R.id.emailTextView);
        streetTextView = (TextView) view.findViewById(R.id.streetTextView);
        cityTextView = (TextView) view.findViewById(R.id.cityTextView);
        stateTextView = (TextView) view.findViewById(R.id.stateTextView);
        zipTextView = (TextView) view.findViewById(R.id.zipTextView);

        // load the contact
        getLoaderManager().initLoader(CONTACT_LOADER, null, this);
        return view;
    }

    // display this fragment's menu items
    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        super.onCreateOptionsMenu(menu, inflater);
        inflater.inflate(R.menu.fragment_details_menu, menu);
    }

    // handle menu item selections
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.action_edit:
                listener.onEditContact(contactUri); // pass Uri to listener
                return true;
            case R.id.action_delete:
                deleteContact();
                return true;
        }

        return super.onOptionsItemSelected(item);
    }

    // delete a contact
    private void deleteContact() {
        // use FragmentManager to display the confirmDelete DialogFragment
        confirmDelete.show(getFragmentManager(), "confirm delete");
    }

    // DialogFragment to confirm deletion of contact
    private final DialogFragment confirmDelete =
            new DialogFragment() {
                // create an AlertDialog and return it
                @Override
                public Dialog onCreateDialog(Bundle bundle) {
                    // create a new AlertDialog Builder
                    AlertDialog.Builder builder =
                            new AlertDialog.Builder(getActivity());

                    builder.setTitle(R.string.confirm_title);
                    builder.setMessage(R.string.confirm_message);

                    // provide an OK button that simply dismisses the dialog
                    builder.setPositiveButton(R.string.button_delete,
                            new DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(
                                        DialogInterface dialog, int button) {

                                    // use Activity's ContentResolver to invoke
                                    // delete on the AddressBookContentProvider
                                    getActivity().getContentResolver().delete(
                                            contactUri, null, null);
                                    listener.onContactDeleted(); // notify listener
                                }
                            }
                    );

                    builder.setNegativeButton(R.string.button_cancel, null);
                    return builder.create(); // return the AlertDialog
                }
            };

    // called by LoaderManager to create a Loader
    @Override
    public Loader<Cursor> onCreateLoader(int id, Bundle args) {
        // create an appropriate CursorLoader based on the id argument;
        // only one Loader in this fragment, so the switch is unnecessary
        CursorLoader cursorLoader;

        switch (id) {
            case CONTACT_LOADER:
                cursorLoader = new CursorLoader(getActivity(),
                        contactUri, // Uri of contact to display
                        null, // null projection returns all columns
                        null, // null selection returns all rows
                        null, // no selection arguments
                        null); // sort order
                break;
            default:
                cursorLoader = null;
                break;
        }

        return cursorLoader;
    }

    // called by LoaderManager when loading completes
    @Override
    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
        // if the contact exists in the database, display its data
        if (data != null && data.moveToFirst()) {
            // get the column index for each data item
            int nameIndex = data.getColumnIndex(Contact.COLUMN_NAME);
            int phoneIndex = data.getColumnIndex(Contact.COLUMN_PHONE);
            int emailIndex = data.getColumnIndex(Contact.COLUMN_EMAIL);
            int streetIndex = data.getColumnIndex(Contact.COLUMN_STREET);
            int cityIndex = data.getColumnIndex(Contact.COLUMN_CITY);
            int stateIndex = data.getColumnIndex(Contact.COLUMN_STATE);
            int zipIndex = data.getColumnIndex(Contact.COLUMN_ZIP);

            // fill TextViews with the retrieved data
            nameTextView.setText(data.getString(nameIndex));
            phoneTextView.setText(data.getString(phoneIndex));
            emailTextView.setText(data.getString(emailIndex));
            streetTextView.setText(data.getString(streetIndex));
            cityTextView.setText(data.getString(cityIndex));
            stateTextView.setText(data.getString(stateIndex));
            zipTextView.setText(data.getString(zipIndex));
        }
    }

    // called by LoaderManager when the Loader is being reset
    @Override
    public void onLoaderReset(Loader<Cursor> loader) { }
}









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