问题
Im following this link answer--> https://stackoverflow.com/a/32323801/12553303 ...on click of item im getting an error of invalid product id...but how do i get id from adapter to activity??????? i have used interface for click listener...
need help in here --> RetrofitClient.instance.deletecart(token, dataList?.get(position)?.product_id.toString())
on debuuging this line
following is my code :--
class CartAdapter(private val context: Context, private val dataList: MutableList<DataCart?>?) :
RecyclerSwipeAdapter<CartAdapter.CustomViewHolder>() , AdapterView.OnItemSelectedListener{ //added RecyclerSwipeAdapter and override
var progressDialog: ProgressDialog? = null
private var itemClick: OnItemClick? = null
inner class CustomViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView){
val mView: View
val swipelayout:SwipeLayout
val productiamge: ImageView
val productname: TextView
val productcategory: TextView
val productprice: TextView
val tvDelete:TextView
val spin:Spinner
init {
mView = itemView
productiamge= mView.findViewById(R.id.imagecart)
productname= mView.findViewById(R.id.imagenamecart)
productcategory= mView.findViewById(R.id.imagecategory)
productprice =mView.findViewById(R.id.price)
swipelayout=mView.findViewById(R.id.swipe)
tvDelete=mView.findViewById(R.id.tvDelete)
spin = mView.findViewById(R.id.spinner) as Spinner
tvDelete.setClickable(true);
tvDelete.setOnClickListener {
if (itemClick != null) {
itemClick!!.onItemClicked(getPosition());
}
}
}
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): CustomViewHolder {
val layoutInflater = LayoutInflater.from(parent.context)
val view: View = layoutInflater.inflate(R.layout.addtocart_item, parent, false)
return CustomViewHolder(view)
}
override fun getSwipeLayoutResourceId(position: Int): Int {
return R.id.swipe;
}
override fun onBindViewHolder(holder: CustomViewHolder, position: Int) {
val progressDialog :ProgressDialog= ProgressDialog(context);
holder.productname.text = dataList?.get(position)?.product?.name ?: null
holder.productcategory.text = "(" +dataList?.get(position)?.product?.product_category +")"
holder.productprice.text = dataList?.get(position)?.product?.cost.toString()
Glide.with(context).load(dataList?.get(position)?.product?.product_images)
.into(holder.productiamge)
holder.swipelayout.setShowMode(SwipeLayout.ShowMode.PullOut)
Log.e("checkidd", dataList?.get(position)?.product?.id.toString())
// Drag From Right
// Drag From Right
holder.swipelayout.addDrag(
SwipeLayout.DragEdge.Right,
holder.swipelayout.findViewById(R.id.bottom_wrapper)
)
//im not able to get this id in activity
val id =dataList?.get(position)?.product?.id
holder.swipelayout.addSwipeListener(object : SwipeListener {
override fun onClose(layout: SwipeLayout) {
//when the SurfaceView totally cover the BottomView.
}
override fun onUpdate(layout: SwipeLayout, leftOffset: Int, topOffset: Int) {
//you are swiping.
}
override fun onStartOpen(layout: SwipeLayout) {}
override fun onOpen(layout: SwipeLayout) {
}
override fun onStartClose(layout: SwipeLayout) {}
override fun onHandRelease(
layout: SwipeLayout,
xvel: Float,
yvel: Float
) {
}
})
holder.swipelayout.getSurfaceView()
.setOnClickListener(View.OnClickListener {
})
holder.tvDelete.setOnClickListener(View.OnClickListener { view ->
mItemManger.removeShownLayouts(holder.swipelayout)
notifyItemChanged(position)
notifyItemRemoved(position)
dataList?.removeAt(position)
notifyItemRangeChanged(position, dataList?.size!!)
mItemManger.closeAllItems()
itemClick?.onItemClicked(position)
})
mItemManger.bindView(holder.itemView, position)
}
override fun getItemCount() = dataList?.size ?: 0
fun progress()
{
progressDialog?.dismiss()
val intent =
Intent(context.applicationContext, AddToCart::class.java)
intent.flags =
Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_MULTIPLE_TASK
context.applicationContext.startActivity(intent)
(context as Activity?)!!.overridePendingTransition(0, 0)
}
override fun onNothingSelected(p0: AdapterView<*>?) {
TODO("Not yet implemented")
}
override fun onItemSelected(p0: AdapterView<*>?, p1: View?, p2: Int, p3: Long) {
}
fun getItemClick(): OnItemClick? {
return itemClick
}
fun setItemClick(itemClick: OnItemClick?) {
this.itemClick = itemClick
}
}
activity:----------
class AddToCart:BaseClassActivity(), OnItemClick{
val dataList: MutableList<DataCart?>? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.add_to_cart)
getWindow().setExitTransition(null)
getWindow().setEnterTransition(null)
var mActionBarToolbar = findViewById<androidx.appcompat.widget.Toolbar>(R.id.toolbartable);
setSupportActionBar(mActionBarToolbar);
// add back arrow to toolbar
setEnabledTitle()
mActionBarToolbar.setNavigationOnClickListener(View.OnClickListener {
onBackPressed()
})
placeorder.setOnClickListener {
val intent:Intent=Intent(applicationContext, AddressActivity::class.java)
startActivity(intent)
}
loadCart()
}
fun loadCart(){
val model = ViewModelProvider(this)[CartViewModel::class.java]
model.CartList?.observe(this, object : Observer<CartResponse> {
override fun onChanged(t: CartResponse?) {
generateDataList(t?.data?.toMutableList())
totalamount.setText(t?.total.toString())
}
})
}
fun generateDataList(dataList: MutableList<DataCart?>?) {
val recyclerView=findViewById<RecyclerView>(R.id.addtocartrecyleview) as? RecyclerView
val linear:LinearLayoutManager=
LinearLayoutManager(applicationContext, LinearLayoutManager.VERTICAL, false)
recyclerView?.layoutManager=linear
val adapter = CartAdapter(this@AddToCart, dataList)
recyclerView?.adapter=adapter
recyclerView?.addItemDecoration(DividerItemDecorator(resources.getDrawable(R.drawable.divider)))
// recyclerView?.setHasFixedSize(true)
adapter.setItemClick(this);
adapter.notifyDataSetChanged()
if (dataList?.isEmpty() ?: true) {
recyclerView?.setVisibility(View.GONE)
totalamount.setVisibility(View.GONE)
fl_footer.setVisibility(View.GONE)
placeorder.setVisibility(View.GONE)
emptytext.setVisibility(View.VISIBLE)
} else {
recyclerView?.setVisibility(View.VISIBLE)
totalamount.setVisibility(View.VISIBLE)
fl_footer.setVisibility(View.VISIBLE)
placeorder.setVisibility(View.VISIBLE)
emptytext.setVisibility(View.GONE)
}
recyclerView?.addOnScrollListener(object :
RecyclerView.OnScrollListener() {
override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
super.onScrollStateChanged(recyclerView, newState)
Log.e("RecyclerView", "onScrollStateChanged")
}
override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
super.onScrolled(recyclerView, dx, dy)
}
})
}
override fun onBackPressed() {
super.onBackPressed()
val intent = Intent(this, HomeActivity::class.java)
startActivity(intent)
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
return when (item.itemId) {
android.R.id.home -> {
NavUtils.navigateUpFromSameTask(this)
true
}
else -> super.onOptionsItemSelected(item)
}
}
override fun onResume() {
super.onResume()
loadCart()
}
override fun onItemClicked(position: Int) {
val token: String = SharedPrefManager.getInstance(applicationContext).user.access_token.toString()
RetrofitClient.instance.deletecart(token, dataList?.get(position)?.product_id.toString())
.enqueue(object : Callback<DeleteResponse> {
override fun onFailure(call: Call<DeleteResponse>, t: Throwable) {
Log.d("res", "" + t)
}
override fun onResponse(
call: Call<DeleteResponse>,
response: Response<DeleteResponse>
) {
var res = response
if (res.body()?.status == 200) {
Toast.makeText(
applicationContext,
res.body()?.message,
Toast.LENGTH_LONG
).show()
} else {
try {
val jObjError =
JSONObject(response.errorBody()!!.string())
Toast.makeText(
applicationContext,
jObjError.getString("message") + jObjError.getString("user_msg"),
Toast.LENGTH_LONG
).show()
} catch (e: Exception) {
Toast.makeText(applicationContext, e.message, Toast.LENGTH_LONG).show()
Log.e("errorrr", e.message)
}
}
}
})
}
}
need help thanks
回答1:
To get response/data back from adapter to activity, you'll need to implement callback pattern like below example:
RecyclerView Adapter sudo code:
class RecyclerViewAdapter(
other variables,
private val dataCallback: (Desired data type you want to return to activity) -> Unit // This is how you can construct lambda callback in Kotlin
): RecyclerView.Adaper..(){
override fun onBindViewHolder(...) {
// Let's say here you have click listener or some other event on which you want data to send back to activity then simply call like below:
dataCallback(outputData) // This can be `dataList?.get(position)?.product?.id`
}
}
Activity callback sudo code:
class SampleActivity: AppCompatActivity() {
lateinit var adapter: RecyclerViewAdapter
override fun onCreate(...){
adapter = RecyclerViewAdapter(other values) { desiredData ->
// Here you can receive data back as callback
}
// Example from O.P.
// val adapter = CartAdapter(this@AddToCart, dataList) { output -> }
}
}
Basically you create a callback receiver type on your adapter constructor as following:
nameOfCallbackVariable: (TypeOfDataYouWantToProvideBack) -> ReturnType
I.e. productSelectedCallback: (Int) -> Unit where you send your selected id (Int) back to consumer.
When you need to provide that data back, you can invoke it like this: nameOfCallbackVariable(valueOfIntType).
来源：https://stackoverflow.com/questions/64531897/clicklistener-not-working-in-recyclerview