an example usage of FloatingActionMenu.MenuStateChangeListener to rotate the icon on the button when the menu is opened or closed

FloationgActionButtonRotation.java

// Set up the white button on the lower right corner
// more or less with default parameter
final ImageView fabIconNew = new ImageView(this);
fabIconNew.setImageDrawable(getResources().getDrawable(R.drawable.ic_action_new_light));
final FloatingActionButton rightLowerButton = new FloatingActionButton.Builder(this)
        .setContentView(fabIconNew)
        .build();

SubActionButton.Builder rLSubBuilder = new SubActionButton.Builder(this);
ImageView rlIcon1 = new ImageView(this);
ImageView rlIcon2 = new ImageView(this);
ImageView rlIcon3 = new ImageView(this);
ImageView rlIcon4 = new ImageView(this);

rlIcon1.setImageDrawable(getResources().getDrawable(R.drawable.ic_action_chat_light));
rlIcon2.setImageDrawable(getResources().getDrawable(R.drawable.ic_action_camera_light));
rlIcon3.setImageDrawable(getResources().getDrawable(R.drawable.ic_action_video_light));
rlIcon4.setImageDrawable(getResources().getDrawable(R.drawable.ic_action_place_light));

// Build the menu with default options: light theme, 90 degrees, 72dp radius.
// Set 4 default SubActionButtons
final FloatingActionMenu rightLowerMenu = new FloatingActionMenu.Builder(this)
                                        .addSubActionView(rLSubBuilder.setContentView(rlIcon1).build())
                                        .addSubActionView(rLSubBuilder.setContentView(rlIcon2).build())
                                        .addSubActionView(rLSubBuilder.setContentView(rlIcon3).build())
                                        .addSubActionView(rLSubBuilder.setContentView(rlIcon4).build())
                                        .attachTo(rightLowerButton)
                                        .build();

// Listen menu open and close events to animate the button content view
rightLowerMenu.setStateChangeListener(new FloatingActionMenu.MenuStateChangeListener() {
    @Override
    public void onMenuOpened(FloatingActionMenu menu) {
        // Rotate the icon of rightLowerButton 45 degrees clockwise
        fabIconNew.setRotation(0);
        PropertyValuesHolder pvhR = PropertyValuesHolder.ofFloat(View.ROTATION, 45);
        ObjectAnimator animation = ObjectAnimator.ofPropertyValuesHolder(fabIconNew, pvhR);
        animation.start();
    }

    @Override
    public void onMenuClosed(FloatingActionMenu menu) {
        // Rotate the icon of rightLowerButton 45 degrees counter-clockwise
        fabIconNew.setRotation(45);
        PropertyValuesHolder pvhR = PropertyValuesHolder.ofFloat(View.ROTATION, 0);
        ObjectAnimator animation = ObjectAnimator.ofPropertyValuesHolder(fabIconNew, pvhR);
        animation.start();
    }
})