I'm launching a DialogFragment which has a ViewPager in it, which in turn will have multiple fragments in it.
When i try to actually add the fragments inside the ViewPager though, I get an IllegalArgumentException saying the view is not found:
03-14 16:44:11.989    3617-3617/com.mycompany.app.debug E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.IllegalArgumentException: No view found for id 0x7f090146 for fragment GuestProfileQuestionnaireStep1Fragment{5375fa28 #3 id=0x7f090146}
            at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:823)
            at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1035)
            at android.app.BackStackRecord.run(BackStackRecord.java:635)
            at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1397)
            at android.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:437)
            at android.support.v13.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:167)
            at android.support.v4.view.ViewPager.populate(ViewPager.java:1068)
            at android.support.v4.view.ViewPager.populate(ViewPager.java:914)
            at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1436)
            at android.view.View.measure(View.java:15172)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
            at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1390)
            at android.widget.LinearLayout.measureVertical(LinearLayout.java:681)
            at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
            at android.view.View.measure(View.java:15172)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
            at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
            at android.view.View.measure(View.java:15172)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
            at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
            at android.view.View.measure(View.java:15172)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
            at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2148)
            at android.view.View.measure(View.java:15172)
            at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1848)
            at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1075)
            at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1273)
            at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:998)
            at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4212)
            at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
            at android.view.Choreographer.doCallbacks(Choreographer.java:555)
            at android.view.Choreographer.doFrame(Choreographer.java:525)
            at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
            at android.os.Handler.handleCallback(Handler.java:615)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4745)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
            at dalvik.system.NativeStart.main(Native Method)
So basically I have the following flow:
Activity --> DialogFragment (has a) > ViewPager --> calls Adapter that in turn calls multiple fragments. Here's some relevant code:
DialogFragment
public class GuestProfileQuestionnaireContainerDialogFragment
        extends DialogFragment  {
    @InjectView(R.id.guest_profile_questionnaire_pager) ViewPager mProfileQuestionnairePager;
    // ...
    @Override
    public View onCreateView(LayoutInflater inflater,
                             ViewGroup container,
                             Bundle savedInstanceState) {
        View layoutView = inflater.inflate(R.layout.fragment_guest_profile_questionnaire_container,
                                           container,
                                           false);
        ButterKnife.inject(this, layoutView);
        // ...
        setupProfileQuestionnaire();
        return layoutView;
    }
    // ...
    private void setupProfileQuestionnaire() {
        mProfileQuestionnairePager.setAdapter(new GuestProfileQuestionnairePagerAdapter(getFragmentManager()));
    }
}
layout (nothing fancy here)
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:orientation="vertical"
    android:layout_height="wrap_content"
    android:layout_width="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <FrameLayout ...
    <TextView ...
    <android.support.v4.view.ViewPager
        android:id="@+id/guest_profile_questionnaire_pager"
        android:layout_height="match_parent"
        android:layout_width="match_parent"/>
</LinearLayout>
PagerAdapter that populates fragments
public class GuestProfileQuestionnairePagerAdapter
        extends FragmentStatePagerAdapter {
    public static final int TOTAL_NUM_OF_STEPS = 1;
    public GuestProfileQuestionnairePagerAdapter(FragmentManager fm) {
        super(fm);
    }
    @Override
    public int getCount() {
        return TOTAL_NUM_OF_STEPS;
    }
    @Override
    public Fragment getItem(int position) {
        switch (position) {
            case 0:
                return GuestProfileQuestionnaireStep1Fragment.newInstance();
        }
        return null;
    }
}
Fragment
public class GuestProfileQuestionnaireStep1Fragment
        extends Fragment {
    private GuestProfileQuestionnaireStep1Fragment() {
        super();
    }
    public static GuestProfileQuestionnaireStep1Fragment newInstance() {
        return new GuestProfileQuestionnaireStep1Fragment();
    }
    @Override
    public View onCreateView(LayoutInflater inflater,
                             ViewGroup container,
                             Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_guest_profile_questionnaire_step1,
                                container,
                                false);
    }
}
I don't get an exception when my ViewPager is empty. So basically when the ViewPAger alone is inflated there's no problem. However the minute I return an actual fragment within the ViewPager, I get the exception.