databinding 与 RecyclerView.Adapter

打开他

    buildFeatures {
        viewBinding true
    }

布局是这样的

<?xml version="1.0" encoding="utf-8"?>


<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/parentView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/colorWhite"
    android:orientation="horizontal"
    android:paddingStart="5dp"
    android:paddingTop="10dp"
    android:paddingEnd="5dp"
    android:paddingBottom="10dp">

    <ImageView
        android:id="@+id/ivIGE"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:src="@mipmap/gift"
        app:layout_constraintDimensionRatio="1:1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/tvIGEName"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="5dp"
        android:layout_marginTop="5dp"
        android:layout_marginEnd="5dp"
        android:text="木盒"
        android:textColor="@color/color_black"
        android:textSize="20sp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/ivIGE" />

    <TextView
        android:id="@+id/tvIGEPrice"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="5dp"
        android:layout_marginTop="5dp"
        android:text="14000"
        android:textColor="@color/color_red"
        android:textSize="16sp"
        app:layout_constraintHorizontal_chainStyle="spread"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/tvIGEName" />

    <TextView
        android:id="@+id/tvIGEIntegral"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="3dp"
        android:text="@string/integral"
        android:textColor="@color/color_red"
        android:textSize="14sp"
        app:layout_constraintBaseline_toBaselineOf="@id/tvIGEPrice"
        app:layout_constraintStart_toEndOf="@id/tvIGEPrice"
        app:layout_constraintTop_toBottomOf="@id/tvIGEName" />

    <TextView

        android:id="@+id/tvButCount"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="5dp"
        android:layout_marginEnd="5dp"
        android:text="@string/sold_by_"
        android:textSize="12sp"
        android:textColor="@color/color_999999"
        app:layout_constrainedWidth="true"
        app:layout_constraintBaseline_toBaselineOf="@id/tvIGEPrice"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@id/tvIGEIntegral"
        app:layout_constraintTop_toBottomOf="@id/tvIGEName" />


</androidx.constraintlayout.widget.ConstraintLayout>

大概

代码是这样的

package com.anguomob.market.activity

import android.app.Activity
import android.text.TextUtils
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.constraintlayout.widget.ConstraintLayout
import androidx.recyclerview.widget.RecyclerView
import androidx.recyclerview.widget.RecyclerView.ViewHolder
import com.anguomob.total.R
import com.anguomob.total.bean.Goods
import com.anguomob.total.common.AG_QN_PUBLIC
import com.anguomob.total.databinding.ItemGiftExchangeBinding
import com.anguomob.total.utils.AGLogger
import com.anguomob.total.utils.ScreenUtil
import com.bumptech.glide.Glide
import java.math.BigDecimal
import java.math.RoundingMode

class GiftExchangeAdapter(activity: Activity) : RecyclerView.Adapter<ViewHolder>() {
    private var activity: Activity = activity
    var mDataList: ArrayList<Goods>? = null;

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
        val data = ItemGiftExchangeBinding.inflate(LayoutInflater.from(parent.context));
        return ViewHolder(data.root)
    }


    var listener: ((Int, Goods) -> Unit)? = null

    fun setOnItemClickListener(listener: (Int, Goods) -> Unit) {
        this.listener = listener
    }


    fun format1(value: Double): String {
        var bd = BigDecimal(value)
        bd = bd.setScale(2, RoundingMode.HALF_UP)
        return bd.toString()
    }

    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {

        val bind = ItemGiftExchangeBinding.bind(holder.itemView);
        val goods = mDataList!!.get(position);
        bind.parentView.setOnClickListener {
            listener!!(position, goods)
        }
        val publicityMap = goods.publicity_map;
        if (!TextUtils.isEmpty(publicityMap)) {
            val res = publicityMap.split("|")
            val firstMap = AG_QN_PUBLIC + res[0]
            AGLogger.e(TAG, "firstMap $firstMap")
            bind.ivIGE.visibility = View.VISIBLE
            Glide.with(activity).load(firstMap).into(bind.ivIGE)
        } else {
            bind.ivIGE.visibility = View.GONE
        }
        bind.tvIGEName.text = goods.name;
        bind.tvIGEPrice.text = (goods.lowest_price * 1000 + 200).toInt().toString();

        bind.tvButCount.text =
            String.format(activity.resources.getString(R.string.sold_by_), goods.buy_count)


    }


    fun setData(mNoteList: ArrayList<Goods>) {
        mDataList = mNoteList
        notifyDataSetChanged()
    }

    override fun getItemCount(): Int {
        return if (mDataList == null) 0 else mDataList!!.size
    }


    inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        init {


        }
    }


    companion object {
        private const val TAG = "GiftExchangeAdapter"

    }
}

简写了findViewById非常好用