Android仿即刻首页垂直滚动图,炫酷到底！

 //滑动状态
 protected static final int STATUS_SMOOTHING = 0;
 //停止状态
 protected static final int STATUS_STOP = 1;

 //ViewGroup宽高
 protected int mWidth, mHeight;
 //变化的marginTop值
 protected int mSmoothMarginTop;
 //默认状态
 protected int mStatus = STATUS_STOP;
 //滚动时间间隔
 protected int mDuration = 500;
 //重复次数
 protected int mRepeatTimes = 0;

 ...

 @Override
 protected void onSizeChanged(int w, int h, int oldw, int oldh) {
  super.onSizeChanged(w, h, oldw, oldh);
  mWidth = w;
  mHeight = h;
  mSmoothMarginTop = -h;
  initView();
 }

 protected abstract void initView();

 ...

 /**
  * 是否是奇数圈
  *
  * @return 结果
  */
 protected boolean isOddCircle() {
  return mRepeatTimes % 2 == 1;
 }

 private List mImgList = new ArrayList<>();
 private ImageView[] mImgs = new ImageView[2];
 private View mShadowView;

 ...

 @Override
 protected void initView() {

  //如果没有内容，则不进行初始化操作
  if (mImgList.size() == 0) {
   return;
  }

  removeAllViews();

  MarginLayoutParams params = new MarginLayoutParams(mWidth, mHeight);

  //两个ImageView加载前两张图
  for (int i = 0; i 

 @Override
 protected void onLayout(boolean changed, int l, int t, int r, int b) {

  int cCount = getChildCount();
  MarginLayoutParams cParams;

  for (int i = 0; i 

 /**
  * 开启滑动
  *
  */
 public void startSmooth() {

  if (mStatus != STATUS_STOP) {
   return;
  }

  ValueAnimator animator = ValueAnimator.ofFloat(-mHeight, 0);
  animator.setDuration(mDuration);
  animator.setInterpolator(new AccelerateDecelerateInterpolator());
  animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
   @Override
   public void onAnimationUpdate(ValueAnimator animation) {

    float marginTop = (float) animation.getAnimatedValue();
    mSmoothMarginTop = (int) marginTop;

    if (marginTop == 0) {

     postDelayed(new Runnable() {
      @Override
      public void run() {

       mRepeatTimes++;

       mSmoothMarginTop = -mHeight;

       doAnimFinish();

       mStatus = STATUS_STOP;

      }
     }, 50);

    } else {
     doAnim();
    }
   }
  });
  animator.start();
  mStatus = STATUS_SMOOTHING;
 }

 //动画结束
 protected abstract void doAnimFinish();

 //动画进行时
 protected abstract void doAnim();

 @Override
 protected void doAnimFinish() {
  if (isOddCircle()) {
   Glide.with(getContext()).load(getImgPath(mRepeatTimes + 1)).centerCrop().into(mImgs[0]);
  } else {
   Glide.with(getContext()).load(getImgPath(mRepeatTimes + 1)).centerCrop().into(mImgs[1]);
  }
  mShadowView.setAlpha(0);
 }

 @Override
 protected void doAnim() {
  mShadowView.setAlpha(((1 - (-mSmoothMarginTop) / (float) mHeight)));
  requestLayout();
 }