解决SwipeRefreshLayout和RecyclerView时滑动冲突

# 问题复现

SwipeRefreshLayout嵌套RecyclerView，当内容超过屏幕下拉，不知道你是要下拉刷新还是下滑，一直认为你是下拉刷新。

recycler_refresh

【问题伪代码】

class LogoActivity : AppCompatActivity() {

    private lateinit var binding: ActivityLogoBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityLogoBinding.inflate(layoutInflater)
        setContentView(binding.root)

        // 初始化xml控件
        mRecyclerView = binding.mRecyclerView 
        mRefreshLayout = binding.refreshLayout
        
        onPullRefresh()
        onLoadMore()
    }
    
     /**
     * 下拉刷新
     */
    private fun onPullRefresh() {
        mRefreshLayout.setColorSchemeColors(Color.parseColor("#03A9F4"))
        mRefreshLayout.setOnRefreshListener {
            thread {
                Thread.sleep(700) // 这个延迟0.7秒只是为了实现视觉效果，与逻辑无关
                runOnUiThread {
                    loadNewData()
                    mRefreshLayout.isRefreshing = false // 让圆形进度条停下来
                }
            }
        }
    }
    
        private fun onLoadMore() {
        // 设置加载更多监听
        mRecyclerView.addOnScrollListener(object : RecyclerView.OnScrollListener() {
            override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
                super.onScrollStateChanged(recyclerView, newState)
                val manager = recyclerView.layoutManager as LinearLayoutManager
                if (manager != null) {
                    // 当不滑动时
                    when (newState) {
                        RecyclerView.SCROLL_STATE_IDLE -> {
                            loadNewData()
                        }
                        RecyclerView.SCROLL_STATE_DRAGGING -> {}
                        RecyclerView.SCROLL_STATE_SETTLING -> {}
                        else -> {}
                    }
                }
            }

            override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
                super.onScrolled(recyclerView, dx, dy)
                // TODO: 在此处解决滑动冲突
            }
        })
    }
}

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# 解决方式

在1上述TODO处添加代码

mRecyclerView.addOnScrollListener(object : RecyclerView.OnScrollListener() {
    override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
        super.onScrolled(recyclerView, dx, dy)
        val topRowVerticalPosition =
            if (recyclerView == null || recyclerView.childCount === 0)
                0 else recyclerView.getChildAt(0).top
        // 大于0表示正在向上滑动，小于等于0表示停止或向下滑动
        mRefreshLayout.isEnabled = topRowVerticalPosition >= 0
    }
})

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添加好后，再测试一下就可以正常滑动了！

编辑

上次更新: 2022/07/02, 23:36:04

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