Android reyclerview 项目卡在滑动中

如何解决Android reyclerview 项目卡在滑动中

我已经实现了 ItemTouchHelper.SimpleCallback 并启用了左右滑动。我有自己的自定义布局，用于在 onChildDraw() 中绘制的滑动。 但有时当项目向左滑动时，它会卡住不动（自定义布局可见），并且只有当回收器向上/向下滚动直到项目离开屏幕并再次可见时，项目才会返回其原始状态。从日志中，从未调用过 onSwipe()。

我已尝试在 requestDisallowInterceptTouchEvent(true) 中设置 onTouchListener，但问题仍然存在。可能是什么问题？

这是实现：

class FeedSwipeCallback(
    private val infoActivitiesAdapter: InfoActivitiesAdapter,private val context: Context,private val parent: RecyclerView
) : ItemTouchHelper.SimpleCallback(0,ItemTouchHelper.LEFT or ItemTouchHelper.RIGHT) {

    private val readFeedView: View
        get() {
            val view =
                LayoutInflater.from(context).inflate(R.layout.feed_swipe_layout,parent,false)
            val container = view.findViewById<FrameLayout>(R.id.main_view)
            val actionView = view.findViewById<TextView>(R.id.action_text_view)

            container.background = ColorDrawable(context.resources.getColor(R.color.accent_color))
            actionView.text = "Read"
            actionView.setTextColor(context.resources.getColor(R.color.color_v4_secondary))
            actionView.setCompoundDrawablesWithIntrinsicBounds(
                0,R.drawable.in_ic_mark_activity_read,0
            )

            return view
        }

    private val unReadFeedView: View
        get() {
            val view =
                LayoutInflater.from(context).inflate(R.layout.feed_swipe_layout,false)
            val container = view.findViewById<FrameLayout>(R.id.main_view)
            val actionView = view.findViewById<TextView>(R.id.action_text_view)

            container.background =
                ColorDrawable(context.resources.getColor(R.color.color_v4_contextual_menu_and_footer_bg))
            actionView.text = "Unread"
            actionView.setTextColor(context.resources.getColor(R.color.colorPrimaryDesignV4))
            actionView.setCompoundDrawablesWithIntrinsicBounds(
                0,R.drawable.in_ic_mark_activity_unread,0
            )

            return view
        }

    private val deleteFeedView: View
        get() {
            val view =
                LayoutInflater.from(context).inflate(R.layout.feed_swipe_layout,false)
            val container = view.findViewById<FrameLayout>(R.id.main_view)
            val actionView = view.findViewById<TextView>(R.id.action_text_view)

            val params = actionView.layoutParams as FrameLayout.LayoutParams
            params.gravity = Gravity.CENTER_VERTICAL or Gravity.END

            container.background = ColorDrawable(Color.RED)
            actionView.text = "Delete"
            actionView.setTextColor(Color.WHITE)
            actionView.setCompoundDrawablesWithIntrinsicBounds(
                0,R.drawable.in_ic_delete_white,0
            )

            return view
        }

    private var swipeBackReadStatus = false
    private var toggleReadStatus = false

    /**
     * Making only feed view types swipeable since other view types such as warning planks,app update planks should not be swipeable
     */
    override fun getSwipeDirs(
        recyclerView: RecyclerView,viewHolder: RecyclerView.ViewHolder
    ): Int {
        return if (viewHolder is InfoActivitiesAdapter.InfoActivityHolder ||
            viewHolder is InfoActivitiesAdapter.InfoExtraViewHolder
        ) {
            super.getSwipeDirs(recyclerView,viewHolder)
        } else 0
    }

    override fun onMove(
        recyclerView: RecyclerView,viewHolder: RecyclerView.ViewHolder,viewHolder1: RecyclerView.ViewHolder
    ): Boolean {
        return false
    }

    /**
     * This function is called when user completely swipes the item OR swipe is performed
     */
    override fun onSwiped(viewHolder: RecyclerView.ViewHolder,direction: Int) {
        val position = viewHolder.bindingAdapterPosition
        if (direction == ItemTouchHelper.RIGHT) {
            infoActivitiesAdapter.toggleFeedReadState(viewHolder,position)
        } else if (direction == ItemTouchHelper.LEFT) {
            infoActivitiesAdapter.deleteFeedAtPosition(viewHolder,position)
        }
    }


    /**
     * Called by ItemTouchHelper on RecyclerView's onDraw callback.
     * This is where we draw out custom delete and unread layouts
     */
    @SuppressLint("ClickableViewAccessibility")
    override fun onChildDraw(
        c: Canvas,recyclerView: RecyclerView,dX: Float,dY: Float,actionState: Int,isCurrentlyActive: Boolean
    ) {
        super.onChildDraw(c,recyclerView,viewHolder,dX,dY,actionState,isCurrentlyActive)

        if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) {
            // Get RecyclerView item from the ViewHolder
            val itemView = viewHolder.itemView

            // Swiping to the right
            if (dX > 0) {
                // Set the read status to true if user swipes 40% of the viewholder's width
                if (dX > itemView.measuredWidth * 0.4) toggleReadStatus = true

                recyclerView.setOnTouchListener { _,event ->
                    swipeBackReadStatus =
                        event.action == MotionEvent.ACTION_CANCEL || event.action == MotionEvent.ACTION_UP
                    return@setOnTouchListener false
                }

                // Drawing the read/unread feed view
                val unreadView = if (infoActivitiesAdapter.isFeedUnread(
                        viewHolder,viewHolder.bindingAdapterPosition
                    )
                ) readFeedView else unReadFeedView
                drawView(c,unreadView,itemView)
            }
            // Swiping to the left
            else if (dX < 0) {
                // Setting recylerview touch listener to null since we completely remove feed off screen when swiped to left
                recyclerView.setOnTouchListener(null)
                // Drawing the feed delete view
                drawView(c,deleteFeedView,itemView)
            }
        }
    }

    private fun drawView(c: Canvas,view: View,itemView: View) {
        view.measure(
            View.MeasureSpec.getSize(itemView.height),View.MeasureSpec.getSize(itemView.height)
        )
        view.layout(itemView.left,itemView.top,itemView.right,itemView.top + itemView.height)
        c.save()
        c.translate(itemView.left.toFloat(),itemView.top.toFloat())
        view.draw(c)
        c.restore()
    }

    /**
     * Called by the ItemTouchHelper when the user interaction with an element is over and it also completed its animation.
     */
    override fun clearView(recyclerView: RecyclerView,viewHolder: RecyclerView.ViewHolder) {
        // If the feed was swiped 40% off screen,mark the feed as unread
        if (toggleReadStatus) {
            onSwiped(viewHolder,ItemTouchHelper.RIGHT)
            toggleReadStatus = false
        }
        super.clearView(recyclerView,viewHolder)
    }

    /**
     * Converts a given set of flags to absolution direction
     * which means START and END are replaced with LEFT and RIGHT depending on the layout direction.
     * When the feed is swiped to right,the feed need's to be placed back instead of completely going off the screen
     */
    override fun convertToAbsoluteDirection(flags: Int,layoutDirection: Int): Int {
        if (swipeBackReadStatus) {
            swipeBackReadStatus = false
            return 0
        }
        return super.convertToAbsoluteDirection(flags,layoutDirection)
    }
}