<span style="font-size:18px;">最近在用https://github.com/skyfishjy/android-ripple-background开源控件的时候,在Android4.0.x上遇到一个问题,本来优雅的动画变得很快。</span> <span style="font-size:18px;">刚开始以为是硬件加速的问题,但是查资料后,发现google在4.0的时候就默认的把硬件加速打开了,所以之上的版本都应该一样的。后来和同事一起研究的时候发现,好像是animatorSet.setDuration()方法没有效果,又查了源码发现下面的区别:</span>
* each child animation will use its own duration. If the duration is set on the AnimatorSet, * then each child animation inherits this duration. * * @param duration The length of the animation, in milliseconds, of each of the child * animations of this AnimatorSet. */ @Override public AnimatorSet setDuration(long duration) { if (duration < 0) { throw new IllegalArgumentException("duration must be a value of zero or greater"); } // Just record the value for now - it will be used later when the AnimatorSet starts mDuration = duration; return this; }
API 19
/** * Sets the length of each of the current child animations of this AnimatorSet. By default, * each child animation will use its own duration. If the duration is set on the AnimatorSet, * then each child animation inherits this duration. * * @param duration The length of the animation, in milliseconds, of each of the child * animations of this AnimatorSet. */ @Override public AnimatorSet setDuration(long duration) { if (duration < 0) { throw new IllegalArgumentException("duration must be a value of zero or greater"); } for (Node node : mNodes) { // TODO: don't set the duration of the timing-only nodes created by AnimatorSet to // insert "play-after" delays node.animation.setDuration(duration); } mDuration = duration; return this; }
原来是在API15上AnimatorSet.setDuration()方法并没有给它的子objectAnimator设置,解决方案当然是给每个add到animatorSet中的ObjectAnimator都设置自己的duration。
这是最典型的Android版本兼容问题,踩过坑了就不要再犯。
看看上面的黑底就是去不了。。。真是给CSDN的垃圾编译器跪下了!!!!