getChildFragmentManager() not being accepted

Make sure your ViewPagerFragment class extends "android.support.v4.app.Fragmet", and not just "Fragment".

@Rohan Tilekar. You should follow what Ben does in the video Managing the Back Stack to make all your Fragments extend from the v4 support library version of the Fragment class, along with FragmentManager and FragmentTransaction classes. There's also a change in the getFragmentManager method and you should use getSupportFragmentManager instead.

I got myself in the same confusing situation after leaving the Fragment classes as initially imported from the native Fragment class, which worked fine for the functionality of addToBackStack method as it didn't need the fix as in the video above. But at this point in the course, I'm setting them to be imported from the v4 support version because it seems the least confusing way to complete the course.

We need this because of the use of ViewPager and the FragmentPagerAdapter which are requiring the use of the v4 support version of the Fragment class as well. As someone mentioned above, you could extend the v13 support library version of the FragmentPagerAdapter class which allows the use of the native Fragment class, but then you would have to increase the minimum SDK of the project to 17 because it's required by the getChildFragmentManager method.

So all in all, it seems it's best to follow the video instructions even though the teacher notes at the above video say that the issue Ben presents in the video is already solved which suggests we don't need to make the change at that point in the course. But at this point, I think it's best to do so.

Actually I was a bit hasty on my answer. I had to actually raise the min SDK version of my project to 17 in the build.gradle file (Module: app).

Then under dependencies, add the line: compile 'com.android.support:support-v13:+'

Then in your ViewPagerFragment.java file, when you are setting the adapter, make sure you are using the correct version of the FragmentPagerAdapter:

     ViewPager viewPager = (ViewPager) view.findViewById(R.id.viewPager); 
     viewPager.setAdapter(new android.support.v13.app.FragmentPagerAdapter(getChildFragmentManager()) {
           @Override
           public Fragment getItem(int position) {
                   return position == 09 ? ingredientsFragment : directionsFragment; 
           }

Finally, within your IngredientsFragment.java file and your DirectionsFragment.java file, be sure to extend: android.app.Fragment

public class IngredientsFragment extends android.app.Fragment

When I use just Fragment, I get an error on the line:

fragmentTransaction.replace(R.id.placeholder, viewPagerFragment, VIEWPAGER_FRAGMENT);

saying that viewPagerFragment should be of type android.app.Fragment instead. When importing just Fragment this error goes away but of course I then get the error Lucas has.

1. My Ingredients and Directions fragments extend Fragment. 2.My MainActivity extends import android.app.FragmentManager; 3.The below code is ViewPagerFragment. this code // public Fragment getItem(int position) { // Fragment shows error.

getItem() , says is incompatible return type. What is the problem?

import android.support.v4.app.FragmentPagerAdapter; import android.support.v4.view.ViewPager; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.Toast;

/**

• Created by rohan on 9/23/17. */

public class ViewPagerFragment extends Fragment { public static final String KEY_RECIPE_INDEX= "recipe_index";

@Override
public View onCreateView(LayoutInflater inflater,  ViewGroup container, Bundle savedInstanceState) {
    int index = getArguments().getInt(KEY_RECIPE_INDEX);
    Toast.makeText(getActivity(),Recipe.names[index],Toast.LENGTH_SHORT).show();

    final IngrediantsFragment ingrediantsFragment = new IngrediantsFragment();
    final DirectionsFragment directionsFragment = new DirectionsFragment();

    View view = inflater.inflate(R.layout.fragment_viewpager,container,false);
    ViewPager viewPager = (ViewPager)view.findViewById(R.id.viewpager);
        viewPager.setAdapter(new FragmentPagerAdapter(getChildFragmentManager()) {
            @Override
            public Fragment getItem(int position) {
                if(position == 0)
                {
                    return ingrediantsFragment;
                }
                else
                    return directionsFragment;
            }

            @Override
            public int getCount() {