Lab: Add DisplayFragment

Let's do this together as a class.

Create DisplayFragment.java

public class DisplayFragment extends Fragment
{
    @Override
    public View onCreateView( LayoutInflater inflater,
                              ViewGroup container,
                              Bundle savedInstanceState )
    {
        View layout = inflater.inflate( R.layout.display,
                                        container,
                                        false );
        return layout;
    }
}

Create the view

The XML view doesn't exist, so we'll create a file called display.xml in the src/layout/ folder. We'll add the specifics of the view later.

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
</LinearLayout>

Create DisplayFragmentTest.java

@RunWith (RobolectricTestRunner.class)

public class DisplayFragmentTest
{
    @Test
    public void shouldNotBeNull() throws Exception
    {
        DisplayFragment fragment = new DisplayFragment();
        startFragment( fragment);
        assertNotNull( fragment );
    }
}

At this point we should be able to run the test successfully.

Add to view

Let's add our fragment to main.xml (layout file specified in setContentView() of the CalculatorActivity).

<fragment
    android:id="@+id/display_fragment"
    android:name="com.mobiquity.calculator.DisplayFragment"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"/>

Test presence in the activity

@Test
public void shouldHaveDisplayFragment() throws Exception
{
    assertNotNull( activity.getFragmentManager()
                           .findFragmentById( R.id.display_fragment ) );
}

Test & commit

Make sure to run the tests and then commit your work to your repository.