transition manager

public class MainActivity extends Activity {

    protected TransitionManager mTransitionManager;
    protected Scene mScene1;
    protected Scene mScene2;
    protected Scene mCurrentScene;
    protected TransitionSet mForwardSet;
    protected TransitionSet mBackwardSet;

    // Some code omitted for brevity

    public void onButtonClicked(View view) {
        if (mCurrentScene == mScene2) {
            mCurrentScene = mScene1;
        }
        else {
            mCurrentScene = mScene2;
        }

    }

    protected void setupTransitions() {
        // These methods are setting up scenes and transitions sets like in the video
        initScenes();
        initSets(); 

       TransitionManager transition = new TransitionManager(); // Start here!
        mTransitionManager.setTransition(mScene1, mScene2, mForwardSet);
        mTransitionManager.setTransition(mScene2, mScene1, mBackwardSet);  
        mScene2.enter();
    }
}