gistfile1.txt

    public static void expandAnimation(View view) {
        int config_shortAnimTime = WeNoteApplication.instance().getResources().getInteger(android.R.integer.config_shortAnimTime);

        int prevHeight = view.getHeight();
        // TODO:
        int targetHeight = dpToPixel(120);

        ValueAnimator valueAnimator = ValueAnimator.ofInt(prevHeight, targetHeight);
        valueAnimator.setInterpolator(new AccelerateInterpolator());
        valueAnimator.setDuration(config_shortAnimTime);
        valueAnimator.addUpdateListener(animation -> {
            view.getLayoutParams().height = (int) animation.getAnimatedValue();
            view.requestLayout();
        });
        valueAnimator.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation)
            {
                view.getLayoutParams().height = targetHeight;
                view.requestLayout();
            }
        });

        view.setVisibility(View.VISIBLE);
        valueAnimator.start();
    }

    public static void collapseAnimation(View view) {
        int config_shortAnimTime = WeNoteApplication.instance().getResources().getInteger(android.R.integer.config_shortAnimTime);

        int prevHeight = view.getHeight();
        int targetHeight = 0;

        ValueAnimator valueAnimator = ValueAnimator.ofInt(prevHeight, targetHeight);
        valueAnimator.setInterpolator(new AccelerateInterpolator());
        valueAnimator.setDuration(config_shortAnimTime);
        valueAnimator.addUpdateListener(animation -> {
            view.getLayoutParams().height = (int) animation.getAnimatedValue();
            view.requestLayout();
        });
        valueAnimator.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation)
            {
                view.setVisibility(View.GONE);
            }
        });

        valueAnimator.start();
    }