使用RecyclerView实现抖音纵向滚动ViewPager效果，供大家参考，具体内容如下
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重写LinearLayoutManager，在onAttachedToWindow方法中使用 PagerSnapHelper设置RecyclerView条目加载方式为每次滚动加载一页
class MyLinearLayoutManager : LinearLayoutManager {
private lateinit var mPagerSnapHelper: PagerSnapHelper
private var mOnViewPagerListener: OnViewPagerListener? = null
private lateinit var mRecyclerView: RecyclerView
private var mDrift: Int = 0//位移，用来判断移动方向
constructor(context: Context) : this(context, OrientationHelper.VERTICAL)
constructor(context: Context, orientation: Int) : this(context, orientation, false)
constructor(context: Context, orientation: Int, reverseLayout: Boolean) : super(context, orientation, reverseLayout) {
mPagerSnapHelper = PagerSnapHelper()
}
override fun onAttachedToWindow(view: RecyclerView) {
super.onAttachedToWindow(view)
mPagerSnapHelper.attachToRecyclerView(view)//设置RecyclerView每次滚动一页
mRecyclerView = view
mRecyclerView.addOnChildAttachStateChangeListener(mChildAttachStateChangeListener)
}
/**
* 滑动状态的改变
* 缓慢拖拽-> SCROLL_STATE_DRAGGING
* 快速滚动-> SCROLL_STATE_SETTLING
* 空闲状态-> SCROLL_STATE_IDLE
* @param state
*/
override fun onScrollStateChanged(state: Int) {
if (state == RecyclerView.SCROLL_STATE_IDLE){
val viewIdle = mPagerSnapHelper.findSnapView(this)
val positionIdle = getPosition(viewIdle!!)
if (mOnViewPagerListener != null && childCount == 1) {
mOnViewPagerListener!!.onPageSelected(positionIdle, positionIdle == itemCount - 1)
}
}
}
/**
* 布局完成后调用
* @param state
*/
override fun onLayoutCompleted(state: RecyclerView.State?) {
super.onLayoutCompleted(state)
if (mOnViewPagerListener != null) mOnViewPagerListener!!.onLayoutComplete()
}
/**
* 监听竖直方向的相对偏移量
*/
override fun scrollVerticallyBy(dy: Int, recycler: RecyclerView.Recycler?, state: RecyclerView.State?): Int {
this.mDrift = dy
return super.scrollVerticallyBy(dy, recycler, state)
}
/**
* 监听水平方向的相对偏移量
*/
override fun scrollHorizontallyBy(dx: Int, recycler: RecyclerView.Recycler?, state: RecyclerView.State?): Int {
this.mDrift = dx
return super.scrollHorizontallyBy(dx, recycler, state)
}
/**
* 设置监听
* @param listener
*/
fun setOnViewPagerListener(listener: OnViewPagerListener) {
this.mOnViewPagerListener = listener
}
private val mChildAttachStateChangeListener = object : RecyclerView.OnChildAttachStateChangeListener {
override fun onChildViewAttachedToWindow(view: View) {
}
override fun onChildViewDetachedFromWindow(view: View) {
if (mDrift >= 0) {
if (mOnViewPagerListener != null) mOnViewPagerListener!!.onPageRelease(true, getPosition(view))
} else {
if (mOnViewPagerListener != null) mOnViewPagerListener!!.onPageRelease(false, getPosition(view))
}
}
}
interface OnViewPagerListener{
/*释放的监听*/
fun onPageRelease(isNext: Boolean, position: Int)
/*选中的监听以及判断是否滑动到底部*/
fun onPageSelected(position: Int, isBottom: Boolean)
/*布局完成的监听*/
fun onLayoutComplete()
}
}重写RecyclerView条目内容主布局满屏填充
class MyImageView : ImageView {
constructor(context: Context) : this(context, null!!)
constructor(context: Context, attr: AttributeSet) : this(context, attr, 0)
constructor(context: Context, attr: AttributeSet, defStyleAttr: Int) : super(context, attr, defStyleAttr)
override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
val width = View.getDefaultSize(0, widthMeasureSpec)
val height = View.getDefaultSize(0, heightMeasureSpec)
setMeasuredDimension(width, height)
}
}
代码参考：LayoutManagerGroup
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持创新互联。
