CollectionAdapter.java 文件源码

private void startSaturationAnimation(Context context, final AppCompatImageView target) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        target.setHasTransientState(true);
        final AnimUtils.ObservableColorMatrix matrix = new AnimUtils.ObservableColorMatrix();
        final ObjectAnimator saturation = ObjectAnimator.ofFloat(
                matrix, AnimUtils.ObservableColorMatrix.SATURATION, 0f, 1f);
        saturation.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator valueAnimator) {
                target.setColorFilter(new ColorMatrixColorFilter(matrix));
            }
        });
        saturation.setDuration(2000);
        saturation.setInterpolator(AnimUtils.getFastOutSlowInInterpolator(context));
        saturation.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                target.clearColorFilter();
                target.setHasTransientState(false);
            }
        });
        saturation.start();
    }
}