预期效果是大多app都会用到的首页顶部图片banner，3s自动轮播，也可手动切换
用法很简单，做attach就好(以下为kotlin代码)
recyclerView.layoutManager = LinearLayoutManager(context, LinearLayoutManager.HORIZONTAL, false) val snapHelper = PagerSnapHelper() snapHelper.attachToRecyclerView(recyclerView)
自动翻页是定义的handler每3s执行一次recyclerView滚动，但是注意滚动的方法要使用
recyclerView.smoothScrollToPosition(bannerPos)
使用的话scrollToPosition()就不会有左右平滑的效果
如果需要同步更新Indicator，在recyclerView的滑动监听里
recyclerView.addOnScrollListener(object : RecyclerView.OnScrollListener() { override fun onScrollStateChanged(recycler: RecyclerView, newState: Int) { super.onScrollStateChanged(recycler, newState) when (newState) { RecyclerView.SCROLL_STATE_IDLE -> { val viewIdle = snapHelper.findSnapView(recyclerView.layoutManager) if (viewIdle != null) { val pos = recyclerView.layoutManager?.getPosition(viewIdle) ?: 0 updateIndicators(pos) } } } } }) /** * 更新到当前指示器 */ private fun updateIndicators(position: Int) { for (i in 0 until indicatorContainer.childCount) { val childView = indicatorContainer.getChildAt(i) childView.background = if (position == i) resources.getDrawable(R.drawable.shape_indicator_orange) else resources.getDrawable(R.drawable.shape_indicator_gray) } }
补充一下indicator的初始化方法
private fun setIndicators(bannerList: List<String>?) { //只有一页的时候不显示指示器 if (bannerList?.size ?: 0 <= 1) { return } indicatorContainer.removeAllViews() for (i in bannerList!!.indices) { val indicatorView = View(context) indicatorView.background = resources.getDrawable(R.drawable.shape_indicator_gray) val layoutParams: LinearLayout.LayoutParams = LinearLayout.LayoutParams( ConvertUtils.dp2px(6f), ConvertUtils.dp2px(6f) ) if (i != 0) layoutParams.leftMargin = ConvertUtils.dp2px(8f) indicatorView.layoutParams = layoutParams indicatorContainer.addView(indicatorView) } updateIndicators(indicatorContainer, 0) }