Replacing Fragments Within Viewpager

I am currently having an issue with replacing a certain fragment within ViewPager with another. The fragment id like to replace is my 'Departments' which has an Imagebutton id like

Solution 1:

I think the point is to use a fragment as a container.

In your ViewPagerAdapter:

@Overridepublic Fragment getItem(int position) {
        /*
         * IMPORTANT: This is the point. We create a RootFragment acting as
         * a container for other fragments
         */if (position == 0)
            returnnewRootFragment();
        elsereturnnewStaticFragment();
    }

RootFragment layout should look like:

<FrameLayoutxmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:id="@+id/root_frame" ></FrameLayout>

And directly, you fill it with your first "real" fragment:

publicclassRootFragmentextendsFragment {

privatestaticfinalStringTAG="RootFragment";

@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    /* Inflate the layout for this fragment */Viewview= inflater.inflate(R.layout.root_fragment, container, false);

    FragmentTransactiontransaction= getFragmentManager()
            .beginTransaction();
    /*
     * When this container fragment is created, we fill it with our first
     * "real" fragment
     */
    transaction.replace(R.id.root_frame, newFirstFragment());

    transaction.commit();

    return view;
}
}

Finally, you can replace fragments. For instance, inside your "real" fragment you could have a button:

btn.setOnClickListener(newOnClickListener() {

        @OverridepublicvoidonClick(View v) {
            FragmentTransactiontrans= getFragmentManager()
                    .beginTransaction();
            /*
             * IMPORTANT: We use the "root frame" defined in
             * "root_fragment.xml" as the reference to replace fragment
             */
            trans.replace(R.id.root_frame, newSecondFragment());

            /*
             * IMPORTANT: The following lines allow us to add the fragment
             * to the stack and return to it later, by pressing back
             */
            trans.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
            trans.addToBackStack(null);

            trans.commit();
        }
    });

I've developed an example application that shows a similar concept. You could replace a fragment inside a ViewPager without changing to a new Activity. The code is available in:

https://github.com/danilao/fragments-viewpager-example

Solution 2:

I'm assuming you want the Engineering fragment to be on a completely new page, because you aren't using it in your ViewPagerAdapter. If that's the case, create a new Activity, with your Engineering fragment in the layout, and launch the Activity from the engineeringButton click.

The problem is you are trying to shove your Engineering fragment into the View hierarchy of R.layout.activity_departments, and there is (hopefully) no ViewPager in there, hence the error.