ShiftDrawable.java 文件源码

public ShiftDrawable(@NonNull Drawable d, int duration, @Nullable Interpolator interpolator) {
    super(d);
    mAnimator.setDuration(duration);
    mAnimator.setRepeatCount(ValueAnimator.INFINITE);
    mAnimator.setInterpolator((interpolator == null) ? new LinearInterpolator() : interpolator);
    mAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(ValueAnimator animation) {
            if (isVisible()) {
                invalidateSelf();
            }
        }
    });
    mAnimator.start();
}