androidRecyclerView添加footerview详解

class FooterViewAdapter :RecyclerView.Adapter<RecyclerView.ViewHolder>() {

    compaNIOn object {
        const val TYPE_FOOTER: Int = 1
        const val TYPE_NORMAL: Int = 0
    }

    var isFooterView: Boolean = false

    fun setFooterView() {
        this.isFooterView = true
        notifyItemInserted(itemCount)
    }

    fun removeFooterView() {
        this.isFooterView = false
    }


    override fun getItemViewType(position: Int): Int {
        return if (isFooterView && position == itemCount - 1) TYPE_FOOTER else TYPE_NORMAL
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
        if (viewType == TYPE_FOOTER) {
            val view = LayoutInflater.from(parent.context)
                .inflate(R.layout.focus_footer_view_no_line, parent, false)
            return BottomViewHolder(view)
        }
        
        return 设置的其他VIewHolder
    }


    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
        if (getItemViewType(position) == TYPE_FOOTER) return
        你的绑定事件不用动
    }
    class BottomViewHolder(view: View) : RecyclerView.ViewHolder(view) {
    }
    
    override fun getItemCount(): Int {
        return if (isFooterView && mData.size > 0) mData.size + 1
        else mData.size
    }
}

 companion object {
        const val TYPE_FOOTER: Int = 1
        const val TYPE_NORMAL: Int = 0
    }

//设置FooterView
fun setFooterView() {
        this.isFooterView = true
        notifyItemInserted(itemCount)
       //这个方法是通知Adapter有新的Item插入
    }

//移除FooterView
    fun removeFooterView() {
        this.isFooterView = false
    }

override fun getItemViewType(position: Int): Int {
        return if (isFooterView && position == itemCount - 1) TYPE_FOOTER else TYPE_NORMAL
    }

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

 class BottomViewHolder(view: View) : RecyclerView.ViewHolder(view) {
    }

 override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
        if (viewType == TYPE_FOOTER) {
            val view = LayoutInflater.from(parent.context)
                .inflate(R.layout.focus_footer_view_no_line, parent, false)
            return BottomViewHolder(view)
        }
        
        return 设置的其他VIewHolder
    }

 override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
        if (getItemViewType(position) == TYPE_FOOTER) return
        你的绑定事件不用动
    }