Show first-time-user explaination for Google Cast (Android)

cast-ftu.java

    //copied from https://github.com/googlesamples/android-UniversalMusicPlayer
    //modified by xTools
    
    /**
     * Shows the Cast First Time User experience to the user (an overlay that explains what is
     * the Cast icon)
     */
	 
    //call this if device was detected
    private void showFtu(int menuItemId) {
		//cast=R.id.media_route_menu_item
		//fling=R.id.menu_fling
		
		//get menu item
		Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
		if (toolbar != null) {
			Menu menu = toolbar.getMenu();
			View view = menu.findItem(menuItemId).getActionView();
			
			//change text according to cast service
			int titleStringId = 0;
			int descStringId = 0;
			if (menuItemId == R.id.media_route_menu_item) {
				titleStringId = R.string.ftu_cast_title;
				descStringId = R.string.ftu_cast_sub;
			} else if (menuItemId == R.id.menu_fling){
				titleStringId = R.string.ftu_fling_title;
				descStringId = R.string.ftu_fling_sub;
			}
			
			//show ftu
			if (view != null && titleStringId != 0) {
				IntroductoryOverlay overlay = new IntroductoryOverlay.Builder(this) //this = activity context!
						.setMenuItem(view)
						.setTitleText(titleStringId)
						.setSubtitleText(descStringId)
						.setSingleTime()
						.build();
				overlay.show();
			}
		}
    }
	
	private final VideoCastConsumerImpl mCastConsumer = new VideoCastConsumerImpl() {
	//...
	@Override
        public void onCastAvailabilityChanged(boolean castPresent) {
            if (castPresent) {
                new Handler().postDelayed(new Runnable() {

                    @Override
                    public void run() {
                        if (mMediaRouteMenuItem.isVisible()) {
                            LogHelper.d(TAG, "Cast Icon is visible");
                            showFtu();
                        }
                    }
                }, DELAY_MILLIS);
            }
        }
	}