Instantiating FragmentController

FragmentController is actually a fragment that does all the magic. So as a fragment, it needs a container.

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

    <FrameLayout
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</FrameLayout>

To instantiate the controller, you must use the FragmentController#instance(FragmentProvider) method. This method accepts a FragmentProvider that represents the root fragment. Root fragment - that is the first fragment that will be shown when you add the controller to FragmentManager.
See more about FragmentProvider.

Examples

Suppose you're in activity:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ...
    final FragmentController controller = FragmentController.instance(rootFragment);
    getSupportFragmentManager().beginTransaction()
                        .replace(R.id.container, controller, CONTROLLER_TAG)
                        .commit();
    ....

Or if you're in a fragment:

@Override
public void onViewCreated(final View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    ...
    final FragmentController controller = FragmentController.instance(rootFragment);
    getChildFragmentManager().beginTransaction()
                        .replace(R.id.container, controller, CONTROLLER_TAG)
                        .commit();
    ...