动画图像的饱和度

Question

是否有可能随着时间的推移动画图像的饱和度(例如png)？例如,从灰度到全彩.如果我可以使用插值器.

我已经看过EffectFactory和ColorMatrix类,但是我无法将它们与动画/过渡相结合.

例如,在Drawable drawable:a上应用灰度饱和度:

ColorMatrix matrix = new ColorMatrix();
matrix.setSaturation(0);

ColorMatrixColorFilter filter = new ColorMatrixColorFilter(matrix);
drawable.setColorFilter(filter);

并在以后完全饱和:

matrix.setSaturation(1);

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对于任何感兴趣的人,我的完整解决方案基于Simon的答案:

final ColorMatrix matrix = new ColorMatrix();
final Drawable drawable = ... ;

ValueAnimator animation = ValueAnimator.ofFloat(0f, 1f);
animation.setDuration(1000);
//   animation.setInterpolator();
animation.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
    @Override
    public void onAnimationUpdate(ValueAnimator animation) {
        matrix.setSaturation(animation.getAnimatedFraction());
        ColorMatrixColorFilter filter = new ColorMatrixColorFilter(matrix);
        drawable.setColorFilter(filter);
    }
});
animation.start();

Answer 1

使用ValueAnimator肯定可以实现:

ValueAnimator animation = ValueAnimator.ofFloat(0f, 1f);
animation.setDuration(1000);
animation.addUpdateListener(new AnimatorUpdateListener() {
    @Override
    public void onAnimationUpdate(ValueAnimator animation) {
        matrix.setSaturation(animation.getAnimatedFraction());
    }
});
animation.start();