ObjectAnimator animate LinearLayout width

In situations where there isn’t a simple property getter/setter you should use ValueAnimator and perform the animation manually.

Assuming:

• v is the view you’re animating
• END_WIDTH is the target width of the view in pixels.
• DURATION is the desired length of the animation in milliseconds.

Your code should look something like this:

    ValueAnimator anim = ValueAnimator.ofInt(v.getMeasuredWidth(), END_WIDTH);
    anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(ValueAnimator valueAnimator) {
            int val = (Integer) valueAnimator.getAnimatedValue();
            ViewGroup.LayoutParams layoutParams = v.getLayoutParams();
            layoutParams.width = val;
            v.setLayoutParams(layoutParams);
        }
    });
    anim.setDuration(DURATION);
    anim.start();