I have a recyclerView which displays items in cardview with the data from firebase database. I did the coding for launching a new activity when an item is clicked. Now I want to pass the data of the item clicked from the recyclerView to the new activity so that I can display the data in it. I am using kotlin. I watched few videos on yt and tried few methods. As I am a beginner I need help in solving this. Thanks in advance.
I have an RecyclerItemClickListener which launches the new activity when an item is clicked.
RecyclerView class
class storekotlin : Fragment() {
private var param1: String? = null
private var param2: String? = null
var recyclerView: RecyclerView? = null
var productlist = ArrayList<Product>()
private var database: FirebaseDatabase? = null
private var reference: DatabaseReference? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
arguments?.let {
param1 = it.getString(ARG_PARAM1)
param2 = it.getString(ARG_PARAM2)
}
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
var view = inflater.inflate(R.layout.fragment_storekotlin, container, false)
database = FirebaseDatabase.getInstance()
reference = database?.getReference("Products")
val FirebaseListener = object: ValueEventListener {
override fun onDataChange(p0: DataSnapshot) {
val child = p0.children
child.forEach{
var products = Product(it.child("img").value.toString(),
it.child("name").value.toString(), it.child("price").value.toString())
productlist.add(products)
}
val adapter = ProductAdapter(productlist)
recyclerView?.adapter = adapter
}
override fun onCancelled(p0: DatabaseError) {
}
}
reference?.addValueEventListener(FirebaseListener)
recyclerView = view.findViewById(R.id.recyclerview)
recyclerView?.setHasFixedSize(true)
recyclerView?.layoutManager = GridLayoutManager(activity, 1,
GridLayoutManager.VERTICAL, false)
val defuserimg: ImageView = view.findViewById(R.id.defuserimg)
val defuser: TextView = view.findViewById(R.id.defuser)
val info: ImageView = view.findViewById(R.id.info)
val search: EditText = view.findViewById(R.id.search)
defuserimg.setOnClickListener {
val intent = Intent(activity, signin_page::class.java)
startActivity(intent)
}
defuser.setOnClickListener {
val intent = Intent(activity, signin_page::class.java)
startActivity(intent)
}
info.setOnClickListener {
val intent = Intent(activity, aboutpage::class.java)
startActivity(intent)
}
recyclerView?.addOnItemTouchListener(
RecyclerItemClickListener(
activity, recyclerView!!, object :
RecyclerItemClickListener.OnItemClickListener {
override fun onItemClick(view: View, position: Int) {
val intent = Intent(activity, productdetails::class.java)
startActivity(intent)
}
override fun onLongItemClick(view: View, position: Int) {
}
})
)
return view
}
companion object {
@JvmStatic
fun newInstance(param1: String, param2: String) =
storekotlin().apply {
arguments = Bundle().apply {
putString(ARG_PARAM1, param1)
putString(ARG_PARAM2, param2)
}
}
}
}
RecyclerAdapter class
class ProductAdapter(private var productlist:MutableList<Product>):
RecyclerView.Adapter<ProductAdapter.ProductViewHolder>() {
override fun onCreateViewHolder(
parent: ViewGroup,
viewType: Int
): ProductViewHolder {
val layoutView:View =
LayoutInflater.from(parent.context).inflate(R.layout.itemcard,parent,false)
return ProductViewHolder(layoutView)
}
override fun onBindViewHolder(holder: ProductViewHolder, position: Int) {
Picasso.get().load(productlist[position].prdimg).into(holder.prdimg)
holder.prdname.text = productlist[position].prdname
holder.prdprice.text = productlist[position].prdprice
}
override fun getItemCount(): Int {
return productlist.size;
}
inner class ProductViewHolder(view: View): RecyclerView.ViewHolder(view){
var prdimg: ImageView = view.findViewById(R.id.prdimg)
var prdname: TextView = view.findViewById(R.id.prdname)
var prdprice: TextView = view.findViewById(R.id.prdprice)
}
CodePudding user response：
easiest way
in adapter class do like
class ProductAdapter(val fragment: storekotlin,private var productlist:MutableList<Product>):
RecyclerView.Adapter<ProductAdapter.ProductViewHolder>() {
override fun onCreateViewHolder(
parent: ViewGroup,
viewType: Int
): ProductViewHolder {
val layoutView:View =
LayoutInflater.from(parent.context).inflate(R.layout.itemcard,parent,false)
return ProductViewHolder(layoutView)
}
override fun onBindViewHolder(holder: ProductViewHolder, position: Int) {
Picasso.get().load(productlist[position].prdimg).into(holder.prdimg)
holder.prdname.text = productlist[position].prdname
holder.prdprice.text = productlist[position].prdprice
holder.itemView.setOnClickListener {
val name = productlist[position].prdname
val price= productlist[position].prdprice
fragment.deatailsList(name , price) // here you can send just the position it will be more efficient
}
}
override fun getItemCount(): Int {
return productlist.size;
}
inner class ProductViewHolder(view: View): RecyclerView.ViewHolder(view){
var prdimg: ImageView = view.findViewById(R.id.prdimg)
var prdname: TextView = view.findViewById(R.id.prdname)
var prdprice: TextView = view.findViewById(R.id.prdprice)
}
in storekotlin Fragment onCreateView method pass the list and fragment like this
val adapter = ProductAdapter(this@storekotlin,productlist)
recyclerView?.adapter = adapter
in storekotlin activity create another method
fun deatailsList(name: String, price: String?) {
// Log.d(ContentValues.TAG, "myList:${dataList.size}")
val intent = Intent(requireContext(), DetailsActivity::class.java)
intent.putExtra("nameKey", name)
intent.putExtra("priceKey", price)
startActivity(intent)
}
in Details activity onCreate method
val intent = intent
val rcvName = intent.getStringExtra("nameKey")
val rcvPrice= intent.getStringExtra("priceKey")
// now you can print here the selected value
textDayIncome_id.text = rcvName
textDayExpense_id.text = rcvPrice