基于Kotlin 封装BaseRecyclerAdapter

Adapter Base基类

package com.niudong.lib_pays.adapter
import com.niudong.lib_pays.BaseViewHolder
import android.view.LayoutInflater
import android.view.ViewGroup
import androidx.recyclerview.widget.RecyclerView
import java.lang.RuntimeException

 /**
  * TODO Adapter Base基类 支持多类型 Head+List
 */
abstract class BaseListAdapter<T> :     
RecyclerView.Adapter<BaseViewHolder<T>>() {
private lateinit var mData: List<T>

companion object {
    const val TYPE_HEAD = 0
    const val TYPE_LIST = 1
    var mLayout = HashMap<Int, Int>()
}


//头部点击 携带文案
var itemHeadClickListener: ((v: String) -> Unit)? = null
var itemListClickListener: ((v: T, pos: Int) -> Boolean)? = null


override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): BaseViewHolder<T> {
    if (mLayout.isNullOrEmpty()) throw RuntimeException("添加mLayout")
    val get = mLayout[viewType]
    val view = LayoutInflater.from(parent.context)
        .inflate(get!!, parent, false)
    //标记tag
    view.tag = viewType
    return BaseViewHolder(view, itemListClickListener, itemHeadClickListener)
}

override fun onBindViewHolder(holder: BaseViewHolder<T>, position: Int) {
    val pos = if (holder.itemViewType == TYPE_HEAD || !isHasHead()) position else position - 1
    bindData(holder, mData[pos])
    holder.setData(mData[pos])
}


abstract fun isHasHead(): Boolean

abstract fun bindData(
    holder: BaseViewHolder<T>,
    data: T
)

abstract fun addTypeAndLayout()

override fun getItemCount(): Int {
    return mData.size + if (isHasHead()) 1 else 0
}

fun setData(listData: List<T>) {
    this.mData = listData
    notifyDataSetChanged()
}

override fun getItemViewType(position: Int): Int {
    return if (position == 0 && isHasHead()) {
        TYPE_HEAD
    } else {
        TYPE_LIST
    }
  }

}

Adapter 子类继承

package com.niudong.lib_pays.adapter
import com.niudong.lib_pays.BaseViewHolder
import android.graphics.Color
import com.niudong.lib_pays.R
import com.niudong.lib_pays.bean.PayData

class TestAdapter : BaseListAdapter<PayData>() {
init {
    addTypeAndLayout()
}

override fun addTypeAndLayout() {
    mLayout[TYPE_HEAD] = R.layout.item_pay_head_layout
    mLayout[TYPE_LIST] = R.layout.item_pay_layout
}

override fun isHasHead(): Boolean {
    return true
  }

override fun bindData(holder: BaseViewHolder<PayData>, data: PayData) {
    if (holder.itemViewType== TYPE_HEAD) {
        holder.itemView.setBackgroundColor(Color.parseColor("#FAD3D3"))
    }else{
        holder.itemView.setBackgroundColor(if (data.mType == 0) Color.RED else Color.YELLOW)
        holder.setText(R.id.tv_hint,data.value)
    }
  }
}

BaseViewHolder

package com.niudong.lib_pays
import android.view.View
import android.widget.TextView
import androidx.annotation.IdRes
import androidx.collection.SparseArrayCompat
import androidx.recyclerview.widget.RecyclerView

/**
 * com.niudong.lib_pays.BaseViewHolder 处理通用Holder
 */
class BaseViewHolder<T>(
mItemView: View,
itemListClick: ((v: T, pos: Int) -> Boolean)?,
itemHeadClick: ((v: String) -> Unit)?
) : RecyclerView.ViewHolder(mItemView),
View.OnClickListener {

private var mViews: SparseArrayCompat<View>? = null
private var mData: T? = null
private var mView = mItemView
private var itemListClickListener = itemListClick
private var itemHeadClickListener = itemHeadClick

init {
    mViews = SparseArrayCompat()
    mView.setOnClickListener(this)
}

fun setData(data: T) {
    this.mData = data
}

override fun onClick(v: View?) {

    mData?.let {
        val tag = v?.tag
        if (tag == 0) {
            itemHeadClickListener?.invoke("Click Head${adapterPosition}")
        } else {
            itemListClickListener?.invoke(it, adapterPosition)
        }
    }
}

/**
 * 通过控件的Id获取对应的控件，如果没有则加入mViews，则从item根控件中查找并保存到mViews中
 */
private fun <V : View> findViewById(@IdRes viewId: Int): V {
    var view: View? = mViews?.get(viewId)
    if (view == null) {
        view = itemView.findViewById(viewId)
        mViews?.put(viewId, view)
    }
    return view as V
}

/**
 * 设置对应id的控件的文本内容

 */
fun setText(@IdRes viewId: Int, text: CharSequence?): BaseViewHolder<T> {
    getTextView(viewId).text = text
    return this
}

/**
 * 通过TextView的Id获取TextView
 *
 */
private fun getTextView(@IdRes viewId: Int): TextView {
    return findViewById(viewId)
}
}