Android Kotlin RecyclerView 自动循环滚动实现：快速滚动、点击、触摸停止、松开继续

要实现 RecyclerView 的自动循环滚动，可以使用以下步骤：

创建一个自定义的 RecyclerViewLayoutManager 类，继承自 LinearLayoutManager 或 GridLayoutManager，重写 canScrollHorizontally() 和 canScrollVertically() 方法，让 RecyclerView 可以水平或垂直滚动。

class CustomLayoutManager : LinearLayoutManager() {

    private var isScrollEnabled = true

    fun setScrollEnabled(scrollEnabled: Boolean) {
        isScrollEnabled = scrollEnabled
    }

    override fun canScrollHorizontally(): Boolean {
        return isScrollEnabled && super.canScrollHorizontally()
    }

    override fun canScrollVertically(): Boolean {
        return isScrollEnabled && super.canScrollVertically()
    }
}

在 RecyclerView 的 Adapter 中，使用 Handler 和 Runnable 实现自动循环滚动功能。在 Adapter 的 onAttachedToRecyclerView() 方法中启动自动滚动。

class CustomAdapter(private val dataList: List<String>) : RecyclerView.Adapter<CustomAdapter.ViewHolder>() {

    private var recyclerView: RecyclerView? = null
    private val handler = Handler()
    private var currentPosition = 0
    private var isAutoScroll = true

    override fun onAttachedToRecyclerView(recyclerView: RecyclerView) {
        super.onAttachedToRecyclerView(recyclerView)
        this.recyclerView = recyclerView
        startAutoScroll()
    }

    override fun onDetachedFromRecyclerView(recyclerView: RecyclerView) {
        super.onDetachedFromRecyclerView(recyclerView)
        this.recyclerView = null
        stopAutoScroll()
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        val view = LayoutInflater.from(parent.context).inflate(R.layout.item_layout, parent, false)
        return ViewHolder(view)
    }

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        holder.bindData(dataList[position])
        holder.itemView.setOnClickListener {
            // 处理点击事件
        }
    }

    override fun getItemCount(): Int {
        return dataList.size
    }

    inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        fun bindData(data: String) {
            // 绑定数据到视图
        }
    }

    private val autoScrollRunnable = object : Runnable {
        override fun run() {
            if (isAutoScroll) {
                currentPosition++
                if (currentPosition >= dataList.size) {
                    currentPosition = 0
                }
                recyclerView?.smoothScrollToPosition(currentPosition)
                handler.postDelayed(this, 3000) // 3秒后继续滚动
            }
        }
    }

    private fun startAutoScroll() {
        isAutoScroll = true
        handler.postDelayed(autoScrollRunnable, 3000)
    }

    private fun stopAutoScroll() {
        isAutoScroll = false
        handler.removeCallbacks(autoScrollRunnable)
    }
}

在 Activity 或 Fragment 中，将自定义的 LayoutManager 和 Adapter 应用到 RecyclerView 上。

val recyclerView = findViewById<RecyclerView>(R.id.recyclerView)
val layoutManager = CustomLayoutManager()
recyclerView.layoutManager = layoutManager
val adapter = CustomAdapter(dataList)
recyclerView.adapter = adapter

如果需要在触摸 RecyclerView 时停止滚动，可以监听 RecyclerView 的触摸事件，在触摸开始时停止自动滚动，在触摸结束时继续滚动。

recyclerView.setOnTouchListener { _, event ->
    when (event.action) {
        MotionEvent.ACTION_DOWN -> {
            layoutManager.setScrollEnabled(false) // 停止滚动
        }
        MotionEvent.ACTION_UP, MotionEvent.ACTION_CANCEL -> {
            layoutManager.setScrollEnabled(true) // 继续滚动
        }
    }
    false
}

这样就实现了可以自动循环滚动、可以快速滚动、滚动中可点击、触摸停止滚动、松开继续滚动的 RecyclerView。

Android Kotlin RecyclerView 自动循环滚动实现：快速滚动、点击、触摸停止、松开继续