Android PagerSnapHelper改造RecyclerView为ViewPage，kotlin

冷不防 2023-10-12 16:38 57阅读 0赞

## Android PagerSnapHelper改造RecyclerView为ViewPage，kotlin ##

<?xml version="1.0" encoding="utf-8"?>
    <androidx.recyclerview.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        tools:context=".MainActivity" />

import android.graphics.Color
    import android.os.Bundle
    import android.view.LayoutInflater
    import android.view.View
    import android.view.ViewGroup
    import android.widget.TextView
    import androidx.appcompat.app.AppCompatActivity
    import androidx.recyclerview.widget.LinearLayoutManager
    import androidx.recyclerview.widget.PagerSnapHelper
    import androidx.recyclerview.widget.RecyclerView
    
    
    class MainActivity : AppCompatActivity() {
        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            setContentView(R.layout.activity_main)
    
            var rv = findViewById<RecyclerView>(R.id.recycler_view)
            var layoutManager: LinearLayoutManager = LinearLayoutManager(this).apply {
                this.orientation = LinearLayoutManager.HORIZONTAL
            }
            rv.layoutManager = layoutManager
    
            var adapter = MyAdapter()
            rv.adapter = adapter
    
            //这将会让RecyclerView滚动时候完整展示一个item
            //val snapHelper = LinearSnapHelper()
            //snapHelper.attachToRecyclerView(rv)
    
            //这将会使RecyclerView滚动的效果如图ViewPager2一样
            val snapHelper = PagerSnapHelper()
            snapHelper.attachToRecyclerView(rv)
    
            //启动后将RecyclerView移到到指定位置。
            layoutManager.scrollToPositionWithOffset(5, 0)
        }
    
        class MyAdapter : RecyclerView.Adapter<MyVH>() {
            override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyVH {
                var view = LayoutInflater.from(parent.context)
                    .inflate(android.R.layout.simple_list_item_2, parent, false)
                view.setBackgroundColor(Color.LTGRAY)
                view.minimumHeight = 800
                return MyVH(view)
            }
    
            override fun getItemCount(): Int {
                return Int.MAX_VALUE
            }
    
            override fun onBindViewHolder(holder: MyVH, position: Int) {
                holder.t1.text = "$position"
                holder.t2.text = "@$position"
            }
        }
    
        class MyVH(itemView: View) : RecyclerView.ViewHolder(itemView) {
            var t1: TextView = itemView.findViewById(android.R.id.text1)
            var t2: TextView = itemView.findViewById(android.R.id.text2)
    
            init {
                t1.textSize = 50.0f
                t2.textSize = 30.0f
            }
        }
    }

![43d55ec70f614e37b6cde36a99595e3c.png][]

[Android:GestureDetector.SimpleOnGestureListener,onFling,onScroll,velocityX,Y&distanceX,Y，kotlin\_zhangphil的博客-CSDN博客Android不用OnScrollListener采用GestureDetector结合OnTouchListener实现ListView下拉/上拉刷新通常Android的ListView的下拉/上拉刷新实现，使用OnScrollListener比较简单，比如如果要实现下拉见顶刷新，思路是在OnScrollListener判断当前ListView的滚动状态，如果滚动停止，则将此时Lis。![favicon32.ico][]https://blog.csdn.net/zhangphil/article/details/130812011][Android_GestureDetector.SimpleOnGestureListener_onFling_onScroll_velocityX_Y_distanceX_Y_kotlin_zhangphil_-CSDN_Android_OnScrollListener_GestureDetector_OnTouchListener_ListView_Android_ListView_OnScrollListener_OnScrollListener_ListView_Lis_favicon32.ico_https_blog.csdn.net_zhangphil_article_details_130812011]

[Android RecyclerView measureTimeMillis Glide GridLayoutManager，kotlin\_zhangphil的博客-CSDN博客基于Android官方Paging Library的RecyclerView分页加载框架我之前写了一篇RecyclerView分页加载机制的文章，是基于Android官方的AsyncListUtil实现的，详情见附录文章1。基于Android官方Paging Library的RecyclerView分页加载框架我之前写了一篇RecyclerView分页加载机制的文章，是基于Android官方的AsyncListUtil实现的，详情见附录文章1。【代码】Android Paging 3,kotlin（1）![favicon32.ico][]https://blog.csdn.net/zhangphil/article/details/131051138][Android RecyclerView measureTimeMillis Glide GridLayoutManager_kotlin_zhangphil_-CSDN_Android_Paging Library_RecyclerView_RecyclerView_Android_AsyncListUtil_1_Android_Paging Library_RecyclerView_RecyclerView_Android_AsyncListUtil_1_Android Paging 3_kotlin_1_favicon32.ico_https_blog.csdn.net_zhangphil_article_details_131051138][Android ViewPager2嵌套RecyclerView性能优化RecycledViewPool，kotlin\_zhangphil的博客-CSDN博客ViewPager2和Fragment新的可见性及懒加载解决方案，旨在解决ViewPager（ViewPager2）只有当前Fragment唯一可见时候网络刷新或绘图。注意：过去的setUserVisibleHint()已被废弃，开发者不要再使用基于setUserVisibleHint()解决Fragment可见性和懒加载（或延迟加载）的场景。ViewPager2和Fragment可见性及懒加载解决方案\_viewpager2 懒加载\_zhangphil的博客-CSDN博客。![favicon32.ico][]https://blog.csdn.net/zhangphil/article/details/131231747][Android ViewPager2_RecyclerView_RecycledViewPool_kotlin_zhangphil_-CSDN_ViewPager2_Fragment_ViewPager_ViewPager2_Fragment_setUserVisibleHint_setUserVisibleHint_Fragment_ViewPager2_Fragment_viewpager2 _zhangphil_-CSDN_favicon32.ico_https_blog.csdn.net_zhangphil_article_details_131231747]

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[Android_GestureDetector.SimpleOnGestureListener_onFling_onScroll_velocityX_Y_distanceX_Y_kotlin_zhangphil_-CSDN_Android_OnScrollListener_GestureDetector_OnTouchListener_ListView_Android_ListView_OnScrollListener_OnScrollListener_ListView_Lis_favicon32.ico_https_blog.csdn.net_zhangphil_article_details_130812011]: https://blog.csdn.net/zhangphil/article/details/130812011
[Android RecyclerView measureTimeMillis Glide GridLayoutManager_kotlin_zhangphil_-CSDN_Android_Paging Library_RecyclerView_RecyclerView_Android_AsyncListUtil_1_Android_Paging Library_RecyclerView_RecyclerView_Android_AsyncListUtil_1_Android Paging 3_kotlin_1_favicon32.ico_https_blog.csdn.net_zhangphil_article_details_131051138]: https://blog.csdn.net/zhangphil/article/details/131051138
[Android ViewPager2_RecyclerView_RecycledViewPool_kotlin_zhangphil_-CSDN_ViewPager2_Fragment_ViewPager_ViewPager2_Fragment_setUserVisibleHint_setUserVisibleHint_Fragment_ViewPager2_Fragment_viewpager2 _zhangphil_-CSDN_favicon32.ico_https_blog.csdn.net_zhangphil_article_details_131231747]: https://blog.csdn.net/zhangphil/article/details/131231747