RecyclerView Item 嵌套 ScrollView

RecyclerView Item 嵌套 ScrollView

RecyclerView Item 嵌套 ScrollView 产生 Touch 事件冲突，通过自定义ScrollView来拦截和处理事件

自定义 ItemScrollView 代码如下

import android.content.Context
import android.util.AttributeSet
import android.view.MotionEvent
import android.widget.ScrollView

class ItemScrollView @JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null,
    defStyleAttr: Int = 0
) : ScrollView(context, attrs, defStyleAttr) {

    override fun onInterceptTouchEvent(ev: MotionEvent?): Boolean {
        parent.requestDisallowInterceptTouchEvent(true)
        return super.onInterceptTouchEvent(ev)
    }

    private var lastY: Float = 0f

    override fun onTouchEvent(ev: MotionEvent?): Boolean {
        when (ev?.action) {
            MotionEvent.ACTION_DOWN -> {
                lastY = ev.y
            }

            MotionEvent.ACTION_MOVE -> {
                val currentY = ev.y
                this.scrollBy(0, (lastY - currentY).toInt())
                lastY = currentY
            }

            MotionEvent.ACTION_UP -> {
                lastY = 0f
            }
        }

        return canScroll()
    }

    private fun canScroll(): Boolean {
        val child = getChildAt(0)
        child?.let {
            return height < child.height
        }
        return false
    }
}