android - 如何使用 ViewPropertyAnimator 将 Width 设置为特定值

Question

如何使用 ViewPropertyAnimator 设置 View 宽度？

我可以缩放或平移(见下文)但我无法设置为特定宽度。

frame_1.animate().scaleX(5).scaleY(5).start();

但是没有

frame_1.animate().width(1024).height(768).start();

Answer 1

试试这个，甚至支持 Android 2.3:

    ValueAnimatorCompat exitAnimator = AnimatorCompatHelper.emptyValueAnimator();
    exitAnimator.setDuration(TransitCompat.ANIM_DURATION * 4);
    exitAnimator.addUpdateListener(new AnimatorUpdateListenerCompat() {
        private float oldWidth =  view.getWidth();
        private float endWidth = 0;
        private float oldHeight =  view.getHeight();
        private float endHeight = 0;
        private Interpolator interpolator2 = new BakedBezierInterpolator();//Any other will be also O.K.

        @Override
        public void onAnimationUpdate(ValueAnimatorCompat animation) {
            float fraction = interpolator2.getInterpolation(animation.getAnimatedFraction());

            float width =  oldWidth + (fraction * (endWidth - oldWidth));
            mTarget.get().getLayoutParams().width = (int) width;

            float height =  oldHeight + (fraction * (endHeight - oldHeight));
            view.getLayoutParams().height = (int) height;


            view.requestLayout();
        }
    });

    exitAnimator.start();