Follow these steps to update and query the device profile.

1. Start a new Xamarin.Android Project.
2. Double-click the project in Visual Studio for Mac's solution pad, or open project Properties in Visual Studio.
3. Select Build > General in the Project Options dialog or Properties navigator.
4. Ensure that the Target Framework is at least Android 3.1 (Honeycomb).
5. Select Build > Android Application.
6. Set the Minimum Android version to API Level 12 (Android 3.1).
7. Select OK to close the Project Options.
8. Select File > New > Android > Android Class, and name the class MyFragment, and click New.
9. Edit the new class you created, inheriting from Android.App.Fragment:

public class MyFragment : Fragment
{
}

10. Edit the new class, and override OnCreateView to inflate the layout file that the fragment will use, and to display some text in the layout:

public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
    var textToDisplay = new StringBuilder().Insert(0, "The quick brown fox jumps over the lazy dog. ", 450).ToString();
    var view = inflater.Inflate(Resource.Layout.MyFragment, container, false);
    var textView = view.FindViewById<TextView>(Resource.Id.text_view);
    textView.Text = textToDisplay;

    return view;
}

Now it is time to display the fragment inside of an Activity. There are two ways to do so: programmatically or via the layout file.

• Adding the fragment programmatically - go to step #11 below.
• Adding the fragment via a layout - proceed directly to step #13 below. Skip steps #11 and #12.

11. To add a fragment programmatically, first edit the layout file Main.axml, and add a FrameLayout to host MyFragment:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/fragment_container"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
</FrameLayout>

12. Edit the file MainActivity.cs, and modify OnCreate to instantiate a new instance of MyFragment and then add that instance to the FrameLayout that was declared above in step # inside of a FragmentTransaction:

protected override void OnCreate (Bundle bundle)
{
    base.OnCreate (bundle);
    SetContentView (Resource.Layout.Main);

    var newFragment = new MyFragment ();
    var ft = FragmentManager.BeginTransaction ();
    ft.Add (Resource.Id.fragment_container, newFragment);
    ft.Commit ();
}

13. Proceed to step #15 below. Skip step #14 below.
14. To add a fragment via a layout, modify Main.axml to reference the fragment directly. It is very important to notice that the package name of MyFragment is lower-case. If it is not lower-case, then an Android.View.InflateException will be thrown.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/fragment_container"
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <fragment class="createafragment.MyFragment"
          android:id="@+id/my_fragment"
          android:layout_width="match_parent"
          android:layout_height="match_parent" />
</LinearLayout>

15. Run the application. It should now look something like:

Fragments cannot exist independently; they must be hosted inside another ViewGroup such as an Activity. Fragments are available on API level 11 (Android 3.0 / Honeycomb) or higher (Android 4.0). It is possible to use fragments on older version of Android by using the Android Support Package.

It is very important to remember that when adding a fragment to a layout file, that Android expects the package name to be lower-case. If the package name is upper-case then an Android.Views.InflateException will be thrown.