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POAndroid smooth width change animation
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  1. POAndroid smooth width change animation
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    copied!<p>Have anybody know how to implement a smooth width-change animation on Android? I've checked several examples with custom Animation class, or by ValueAnimator+AnimatorUpdateListener - but their work is not smooth, especially when there are several additional animations on the same time working on. </p> <p>Any ideas? Thanks</p> <p>I'm animating items in the list with next code (it's not smooth with even 4 items), also sometimes with them occurs animation with translation of a view from top to bottom - and it is also not smooth (but if the translation animation work without list items width change - it's smooth):</p> <pre><code> public void showDragHold() { isOnDrag = true; int width = -1; int duration = 0; LinkedList&lt;Animator&gt; valueAnimators = new LinkedList&lt;Animator&gt;(); for (View view : views) { View dragView = view.findViewById(R.id.list_handle_drag); if (width &lt; 0) { width = dragView.getResources().getDimensionPixelSize(R.dimen.drag_width); duration = dragView.getResources().getInteger(R.integer.anim_fast_duration); } ValueAnimator valueAnimator = ValueAnimator.ofInt(0, width); valueAnimator.addUpdateListener(new ResizeUpdateAnimator(dragView)); valueAnimators.add(valueAnimator); } if (!valueAnimators.isEmpty()) { AnimatorSet animatorSet = new AnimatorSet(); animatorSet.playTogether(valueAnimators); animatorSet.setDuration(duration); animatorSet.start(); } } private static final class ResizeUpdateAnimator implements ValueAnimator.AnimatorUpdateListener { private View view; public ResizeUpdateAnimator(View view) { this.view = view; } @Override public void onAnimationUpdate(ValueAnimator valueAnimator) { final int newWidth = (Integer) valueAnimator.getAnimatedValue(); view.getLayoutParams().width = newWidth; view.requestLayout(); } } </code></pre>
 

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