RecyclerView動態添加item和刪除item（基於kotlin）

核心代碼：activity

class MainActivity : AppCompatActivity() {
    var codeAdapter: CodeAdapter? = null
    var count: Int = 1
    var stringSparseArray: SparseArray<String>? = null
    var mPosition :Int = -1

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        stringSparseArray = SparseArray()
        rv_code_list.layoutManager = LinearLayoutManager(this)
        codeAdapter = CodeAdapter(count, this,stringSparseArray!!)
        rv_code_list.adapter = codeAdapter
        btn_add.setOnClickListener {
            ++count
            codeAdapter!!.setData(count,stringSparseArray!!)

        }
        ItemClickSupport.addTo(rv_code_list).addOnChildClickListener(R.id.iv_scan, object : ItemClickSupport.OnChildClickListener {
            override fun onChildClicked(recyclerView: RecyclerView, position: Int, v: View) {
                mPosition = position
                startActivityForResult<SecondActivity>(888)
            }

        })
        ItemClickSupport.addTo(rv_code_list).addOnChildClickListener(R.id.btn_delete, object : ItemClickSupport.OnChildClickListener {
            override fun onChildClicked(recyclerView: RecyclerView, position: Int, v: View) {
                mPosition = position
                codeAdapter!!.removeData(mPosition,stringSparseArray!!)
                if (count >0){
                    --count
                }

            }

        })



    }


    @SuppressLint("MissingSuperCall")
    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        if (data != null) {
            if (resultCode == Activity.RESULT_OK) {
                val code = when (requestCode) {
                    888 -> data.getStringExtra("data")
                    889 -> data.getStringExtra("data")//批量唯一碼
                    else -> null
                }
                stringSparseArray!!.put(mPosition,code)
                codeAdapter!!.setData(stringSparseArray!!,mPosition)

            }


        }
    }


}

Adapter

class CodeAdapter(var count: Int, val context: Context,var mStringSparseArray: SparseArray<String>) : RecyclerView.Adapter<CodeAdapter.InnerHolder>() {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): InnerHolder {
        //加載view
        val view: View = LayoutInflater.from(context).inflate(R.layout.recycleview_item_delete, parent, false)

        return InnerHolder(view)
    }

    override fun getItemCount(): Int {

        return count
    }

    fun setData(stringSparseArray: SparseArray<String>, index: Int) {
        mStringSparseArray = stringSparseArray
        notifyItemChanged(index)
    }

    fun setData(  mCount: Int,stringSparseArray: SparseArray<String>) {
        count = mCount
        mStringSparseArray = stringSparseArray
        //添加動畫
        notifyItemInserted(mCount -1)
//        notifyDataSetChanged()
    }
    //  刪除數據
    fun removeData(position: Int,stringSparseArray: SparseArray<String>) {
        mStringSparseArray = stringSparseArray
        mStringSparseArray.delete(position)
        if (count>0){
            --count
        }
        notifyItemRemoved(position)
        notifyDataSetChanged()
    }

    override fun onBindViewHolder(holder: InnerHolder, position: Int) {
        holder.itemText.setText( mStringSparseArray[position])

    }


    class InnerHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        var itemText: EditText = itemView.findViewById(R.id.et_unique_num)
    }
}