如何单击 RecyclerView 项目以转到详细活动并在我单击的 RecyclerView 中应用项目的标题和价格？

Question

I have Recyclerview items in MainActivity .

When I click recyclerview item in mainactivity , go to detailactivity . And then I want apply the titleText and price of the item(realValueText) in the recyclerview that i clicked in detailactivity . How can I do ? Lets see acitivity and adapter .

and u can see detailactivity . finally I want make details view,

productTitle==titleText , productPoint==realValueText.

MainFragment

class MainFragment: Fragment(), SwipeRefreshLayout.OnRefreshListener {

    var itemList: MutableList<ItemDataVo> = arrayListOf()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

    }

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?
    ): View? { return inflater!!.inflate(R.layout.fragmenta, container, false)}

    override fun onActivityCreated(savedInstanceState: Bundle?) {
        super.onActivityCreated(savedInstanceState)

        itemList.clear()

        swipeRefreshLo.setOnRefreshListener(this)

        itemList.add(ItemDataVo("item1", 49000, 29000, "r_300_x_300_3"))
        itemList.add(ItemDataVo("item2", 49000, 29000, "main_cup"))
        itemList.add(ItemDataVo("item3", 49000, 29000, "main_perfume"))
        itemList.add(ItemDataVo("item4", 49000, 29000, "main_fan"))
        itemList.add(ItemDataVo("item5", 49000, 29000, "main_bear"))
        itemList.add(ItemDataVo("item6", 49000, 29000, "main_glass"))

        val itemRecyclerAdapter= ItemRecyclerAdapter(context!!,itemList)
        recycler_view.adapter=itemRecyclerAdapter
        recycler_view.layoutManager = androidx.recyclerview.widget.LinearLayoutManager(context)


    }


    override fun onRefresh() {
            swipeRefreshLo.isRefreshing = false

        }

    }

ItemDataVo

class ItemDataVo(title: String, realValue: Int, pointValue: Int, imageView: String, viewType: Int = 0) {
    var viewType = viewType
    var title :String = title
    var realValue:Int = realValue
    var pointValue:Int =pointValue
    var image :String = imageView
}

ItemRecyclerAdapter

 class ItemRecyclerAdapter(val context: Context, private var dataList: MutableList<ItemDataVo>) : RecyclerView.Adapter<ItemRecyclerAdapter.Holder>() {


        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): Holder {
          val view = LayoutInflater.from(context).inflate(R.layout.item_1_col_list, parent, false)
          return Holder(view)
        }

        override fun onBindViewHolder(holder: Holder, position: Int) {
          holder?.bind(dataList[position],context)
        }

        override fun getItemCount(): Int = dataList.size
        override fun getItemViewType(position: Int): Int = dataList[position].viewType


        inner class Holder(itemView: View?) : RecyclerView.ViewHolder(itemView!!) {
            var titleText = itemView?.findViewById(R.id.titleText) as TextView
            var realValueText = itemView?.findViewById(R.id.realValueText) as TextView
            var pointValueText = itemView?.findViewById(R.id.pointValueText) as TextView
            var imageView = itemView?.findViewById(R.id.imageView)as ImageView
            var itemLayout = itemView?.findViewById(R.id.item_layout) as ConstraintLayout

            fun bind(data:ItemDataVo, context: Context) {
                if(data.image !="") {
                    val resourceId = context.resources.getIdentifier(data.image, "drawable", context.packageName)
                    imageView?.setImageResource(resourceId)
                }else {
                    imageView?.setImageResource(R.mipmap.ic_launcher)
                }

                pointValueText?.text=data.pointValue.toString() + "P"
                realValueText?.text=data.realValue.toString()
                titleText?.text=data.title
                itemLayout?.setOnClickListener {
                    val i = Intent(it.context, DetailItemViewActivity::class.java)
                    it.context.startActivity(i)
                }
            }
        }
    }

DetailItemViewActivity

class DetailItemViewActivity : AppCompatActivity(), SwipeRefreshLayout.OnRefreshListener {


    var Detailslist: MutableList<DetailItemDataVo> = arrayListOf()

    @SuppressLint("ResourceType")
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_details)

        var productTitle = findViewById<TextView>(R.id.productTitle)
        var productpoint = findViewById<TextView>(R.id.productPoint)

Answer 1

The proper way to do this is to let your activity or fragment which holds the recycler view to open the details screen.

Set a onClick listener in the viewholder or in any individual view if the recycler item. When that view is clicked, send a callback to your parent activity. Send the model which was clicked inside the listener callback.

Your activity will get this callback and open the relevant activity.

This way your recycler adapter wont have the reference of the details screen.

Answer 2

Create an Interface like this

    public interface ClickInterface {

    public void recyclerviewOnClick(int position);
}

Implement it in your Fragment and initialize the interface

  YourFragment extends Fragment implements ClickInterface{

private ClickInterface listner;

------- Your oncreateView   --------
listner=this; //Now pass this in your adapter
    }

In your adapter constructor get this listner like this

public MyAdapter(String[] myDataset,ClickInterface listner){
    this.mDataset = myDataset;
    this.listner=listner;
}

and at last in your ViewHolder

public class MyViewHolder extends RecyclerView.ViewHolder{

        public MyViewHolder(View v){
            super(v);


itemLayout.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {

                    listner.recyclerviewOnClick(getAdapterPosition());

                }
            });
        }
    }

Now you will get the position in your fragment in

   public void recyclerviewOnClick(int position){
// Here you will get the position
}