TabHost's getTabWidget() returns null although the object contains mTabWidget

Question

In my Robolectric test I run my fragment by:

sut = new TestedFragment();
SupportFragmentTestUtil.startFragment(sut);

In fragment's onCreateView I have android.support.v4.app.FragmentTabHost on which I try to get its tabWidget using:

inflatedView = inflater.inflate(R.layout.some_layout, container, false);
tabHost = (FragmentTabHost) inflatedView.findViewById(android.R.id.tabhost);
fragmentManager = getChildFragmentManager();
tabHost.setup(getActivity(), fragmentManager, android.R.id.tabcontent);
tabHost.getTabWidget(); //returns null

This line returns null although set up breakpoint on this line shows me that tabHost's mTabWidget has value of android.widget.TabWidget{7a4d42e6 V.E..... ......I. 0,0-0,0 #1020013 android:id/tabs} so why do I get null?

The code works on android, i doesn't work in roboelectric unit test

Other lines of my code are not invoked. Earlier I just `@RunWith`testRunner and I target sdk, and manifest — apex39, Jul 18 '15 at 16:19

score 0 · Answer 1 · answered Sep 17 '16 at 08:41

0

Robolectric use shadow classes to hide some real code. Because not all can be done at JVM or must be adjusted.

Open the class ShadowTabHost and set a breakpoint in the getTabWidget method. Then you can see why you get null.

answered Sep 17 '16 at 08:41

nenick

7,340
3
31
23

score -1 · Answer 2 · answered Jul 17 '15 at 12:55

-1

Try this

 public class MainActivity extends TabActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        //setContentView(R.layout.activity_main);

        TabHost mTabHost = getTabHost();

        mTabHost.addTab(mTabHost.newTabSpec("first").setIndicator("First").setContent(new Intent(this  ,FirstActivity.class )));
        mTabHost.addTab(mTabHost.newTabSpec("second").setIndicator("Second").setContent(new Intent(this , SecondActivity.class )));
        mTabHost.setCurrentTab(0);


    }
    }

answered Jul 17 '15 at 12:55

user1530779

409
5
8

first: he is using `FragmentTabHost` this answer do not apply ... second: `TabActivity` is deprecated – Selvin Jul 17 '15 at 13:02
Thanks for quick response. I don't want to change source code which normally works - I'd like to have a working test – apex39 Jul 17 '15 at 13:04
Can you post some code so as to understand where you are stuck – user1530779 Jul 17 '15 at 13:09

TabHost's getTabWidget() returns null although the object contains mTabWidget

2 Answers2