[안드로이드스튜디오/코틀린]Parcelize 사용하여 데이터전달, 페이지 최상단으로 이동, 버튼 길게누르기

Paracelize사용하여 데이터값 전달하기.

gradle(.app)폴더에서 플러그인을 추가한다.

data class에 Paracelize와 : Pracelable을 추가한다.

받아올 kt파일에서 받아오는 코드를 작성한다.

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import com.example.myapplication.databinding.ActivitySecondBinding

class SecondActivity : AppCompatActivity() {
    private lateinit var binding: ActivitySecondBinding
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivitySecondBinding.inflate(layoutInflater)
        setContentView(binding.root)



        val clickItem = intent.getParcelableExtra<MyItem>("clickItem")

        if (clickItem != null) {

            binding.goods.setImageResource(clickItem.aIcon)
            binding.textView2.text = clickItem.aNickname
            binding.textView3.text = clickItem.aAdress
            binding.textView6.text = clickItem.aTitle
            binding.textView7.text = clickItem.aReason
            binding.textView8.text = clickItem.aPrice

        }
    }
}

페이지 최상단으로 이동 코드

 binding.recyclerView.apply {
            this.adapter = adapter
            layoutManager = LinearLayoutManager(context)
            setHasFixedSize(true)
        }

        val fadeIn = AlphaAnimation(0f, 1f).apply { duration = 500 }
        val fadeOut = AlphaAnimation(1f, 0f).apply { duration = 500 }
        var isTop = true

        binding.recyclerView.addOnScrollListener(object : RecyclerView.OnScrollListener() {
            override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
                super.onScrollStateChanged(recyclerView, newState)
                if (!binding.recyclerView.canScrollVertically(-1)
                    && newState == RecyclerView.SCROLL_STATE_IDLE
                ) {
                    binding.floatingActionButton.startAnimation(fadeOut)
                    binding.floatingActionButton.visibility = View.GONE
                    isTop = true
                } else {
                    if (isTop) {
                        binding.floatingActionButton.visibility = View.VISIBLE
                        binding.floatingActionButton.startAnimation(fadeIn)
                        isTop = false
                    }
                }
            }
        })

        binding.floatingActionButton.setOnClickListener {
            binding.recyclerView.smoothScrollToPosition(0)
        }

버튼 길게눌러 이벤트추가

setOnClickListner와 비슷하게 setOnLongClickeListenr가 있다.

 interface ItemClick {
        fun onClick(view : View, position : Int)

    }
    interface ItemLongClicked{
        fun onItemLongClick(view: View,position: Int): Boolean
    }
    var itemClick : ItemClick? = null
    var itemLongClick : ItemLongClicked? = null

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyAdapter.Holder {
        val binding =
            ItemRecyclerviewBinding.inflate(LayoutInflater.from(parent.context), parent, false)
        return Holder(binding)
    }

    override fun onBindViewHolder(holder: Holder, position: Int) {
        holder.itemView.setOnClickListener {
            itemClick?.onClick(it, position)
        }
        holder.itemView.setOnLongClickListener {
            itemLongClick?.onItemLongClick(it, position)
            true // 롱클릭 이벤트를 소비했음을 반환
        }

참조🤞
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