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
        }
    }
}

 

 

 

 

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