MainActivity.java 文件源码

private void startAnim() {

        rb_start.setVisibility(View.GONE);
        ValueAnimator va = ValueAnimator.ofFloat(0, dp100).setDuration(300);
        va.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {

                float value = (float) animation.getAnimatedValue();
                float dis = value-lastValue;
                iv_back.setX(iv_back.getX()-dis);
                iv_finish.setX(iv_finish.getX()+dis);
                lastValue = value;
            }
        });
        va.start();
    }