android studio - duplicate add data recyclerview after second click after open page

Question

I want to make dynamic recyclerview, so when i click button "add", data will be increase one data. But when i click at the second time, the preview data will show again and after data will be show twice. Like thiserror data

but when i minimize or back, and then look again, the list data show normally for the nomor log, i'm using generate number with some cetegory and MVVM pattern

This is my code

---Activity---

class ProductListActivity : AppCompatActivity(), CoroutineScope {
companion object {
    const val paramTreeId = "param_tree_id"
    const val paramTreeNumber = "param_tree_number"
    const val paramOrderId = "param_order_id"
    const val paramOrderNum = "param_order_num"
    const val paramSpeciesId = "param_species_id"
}


private lateinit var addNewLog: ImageView

private lateinit var job: Job
override val coroutineContext: CoroutineContext
    get() = Dispatchers.Main + job

@Inject
lateinit var viewModelFactory: ViewModelProvider.Factory

private val vm: ProductListViewModel by lazy {
    ViewModelProviders.of(this, viewModelFactory).get(ProductListViewModel::class.java)
}

private var treeId = -1
private var treeNumber = ""
private var orderId = -1
private var orderNum = ""
private var speciesId = 1
private var logNumber: String? = null
private val products = mutableListOf<WoodProduct>()


private val productAdapter = object : RecyclerView.Adapter<ProductItemViewHolder>() {
    override fun onCreateViewHolder(parent: ViewGroup, itemType: Int): ProductItemViewHolder {
        val ui = EditViewProductUi()
        val itemView = ui.createView(AnkoContext.create(parent.context, parent))
        return ProductItemViewHolder(ui, itemView)
    }

    override fun getItemCount(): Int = products.size


    override fun onBindViewHolder(holder: ProductItemViewHolder, position: Int) {
        val product = products[position]
        return holder.bind(product) { product ->
            alert {
                title = "Hapus Data Kayu"
                message = "Hapus data kayu dari daftar?"
                okButton {
                    launch {
                        it.dismiss()
                        products.removeAt(position)
                        vm.deleteProduct(product.copy(deleted = 1))
                        Log.d("data", "delete= $product")
                    }
                }
                cancelButton {
                    it.dismiss()
                }
            }.show()
        }
    }

}


override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    job = Job()
    AndroidInjection.inject(this)
    treeId = intent.getIntExtra(paramTreeId, -1)
    orderId = intent.getIntExtra(paramOrderId, -1)
    treeNumber = intent.getStringExtra(paramTreeNumber)
    orderNum = intent.getStringExtra(paramOrderNum)
    speciesId = intent.getIntExtra(paramSpeciesId, 1)

    coordinatorLayout {
        relativeLayout {
            verticalLayout {
                relativeLayout {
                    backgroundColor = Color.WHITE
                    toolbar {
                        id = R.id.toolbar
                        backgroundColor =
                            ContextCompat.getColor(context, R.color.colorPrimaryDark)
                        setTitleTextColor(Color.WHITE)

                        menu.apply {
                            add("0").setActionView(linearLayout {
                                addNewLog = imageView(R.drawable.ic_plus) {
                                    scaleType = ImageView.ScaleType.FIT_XY
                                }.lparams(dip(38), dip(38)) {
                                    rightMargin = dip(10)
                                }
                                addNewLog.setOnClickListener {
                                    vm.productData.observe(
                                        this@ProductListActivity,
                                        Observer(::onProductUpdate)
                                    )
                                    launch {
                                        vm.loadProduct(orderId, orderNum, treeId, logNumber)
                                    }
                                }
                            }).setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS)
                        }
                    }.lparams {
                        alignParentTop()
                        width = matchParent
                        height = wrapContent
                    }

                    linearLayout {
                        id = R.id.header_log
                        textView("") {
                            typeface = regularFace
                            textSize = regularText
                            textColor = Color.BLACK
                        }.lparams(dip(15), dip(40)) {
                            verticalGravity = Gravity.CENTER
                            horizontalGravity = Gravity.CENTER

                        }

                        textView("") {
                        }.lparams(dip(30), dip(20)) {
                            verticalGravity = Gravity.CENTER
                        }

                        textView("Nomor Log") {
                            isEnabled = false
                            padding = dip(4)
                            typeface = regularFace
                            textSize = regularText
                            textColor = Color.BLACK
                            gravity = Gravity.CENTER
                            textAlignment = View.TEXT_ALIGNMENT_CENTER
                        }.lparams(matchParent, dip(50)) {
                            weight = 2f
                        }

                        textView("Diameter
(cm)") {
                            padding = dip(4)
                            textSize = regularText
                            typeface = regularFace
                            textColor = Color.BLACK
                            textAlignment = View.TEXT_ALIGNMENT_CENTER
                        }.lparams(matchParent, dip(50)) {
                            weight = 3f
                        }

                        textView("Panjang
(cm)") {
                            padding = dip(4)
                            textSize = regularText
                            typeface = regularFace
                            textColor = Color.BLACK
                            textAlignment = View.TEXT_ALIGNMENT_CENTER
                        }.lparams(matchParent, dip(50)) {
                            weight = 3f
                        }

                    }.lparams(matchParent, wrapContent) {
                        below(R.id.toolbar)
                        rightMargin = dip(5)
                        leftMargin = dip(5)
                    }

                    linearLayout {
                        id = R.id.line_log
                        backgroundColor = Color.BLACK
                    }.lparams(matchParent, dip(1)) {
                        topMargin = dip(5)
                        bottomMargin = dip(5)
                        below(R.id.header_log)
                    }

                    verticalLayout {
                        recyclerView {
                            adapter = productAdapter
                            layoutManager = LinearLayoutManager(context)
                        }.lparams(matchParent, matchParent)
                    }.lparams(matchParent, matchParent) {
                        below(R.id.line_log)
                    }

                }.lparams(matchParent, dip(0)) {
                    weight = 1f
                }
                linearLayout {
                    backgroundColor = Color.WHITE
                    val saveButton = button {
                        text = "Ok"
                        textColor = Color.WHITE
                        allCaps = false
                        background =
                            ResourcesCompat.getDrawable(resources, R.drawable.save_button, null)
                    }.lparams(wrapContent, wrapContent) {
                        padding = dip(10)
                    }

                    val cancelButton = button {
                        text = "Batal"
                        allCaps = false
                        textColor = BUTTON_YELLOW
                        background = ResourcesCompat.getDrawable(
                            resources,
                            R.drawable.cancel_button,
                            null
                        )
                    }.lparams(wrapContent, wrapContent) {
                        padding = dip(10)
                        leftMargin = dip(10)
                    }
                }.lparams(matchParent, dip(80)) {
                    gravity = Gravity.RIGHT
                    rightMargin = dip(10)
                }
            }.lparams(matchParent, matchParent)
        }.lparams(matchParent, matchParent)
    }

    val toolbar = findViewById<Toolbar>(R.id.toolbar)
    toolbar.title = "No. Pohon: $treeNumber"
    toolbar.setNavigationIcon(R.drawable.ic_arrow_back_black_24dp)
    toolbar.setNavigationOnClickListener {
        onBackPressed()
    }

    vm.productsData.observe(this, Observer(::updateProducts))
}


private fun onProductUpdate(product: WoodProduct?) {
    product ?: return
    products.add(product)
    launch {
        vm.saveProduct(
            logNumber == null,
            product.diameter,
            product.length,
            product.rejectStatusPetani,
            product.isTaken
        )
    }
    Log.d("size", "product = ${products.size - 1}")
    productAdapter.notifyItemInserted(products.size - 1)
    productAdapter.notifyDataSetChanged()

}

private fun updateProducts(newProducts: List<WoodProduct>?) {
    newProducts ?: return
    products.clear()
    products.addAll(newProducts)
    productAdapter.notifyDataSetChanged()
}


override fun onResume() {
    super.onResume()
    launch {
        vm.loadProducts(treeId)
    }
}}

class ProductItemViewHolder(private val ui: EditViewProductUi, itemView: View) :
RecyclerView.ViewHolder(itemView) {
@SuppressLint("SetTextI18n")
fun bind(product: WoodProduct, onDelete: (WoodProduct) -> Unit) {
    ui.numberPosition.text =
        String.format(itemView.context.getString(R.string.no), adapterPosition + 1)
    ui.logNumberView.setText(product.logNumber)
    ui.diameterView.setText(product.diameter)
    ui.longView.setText(product.length)
    ui.rejectStatusView.setSelection(product.rejectStatusPetani)
    ui.isTakenView.setSelection(product.isTaken)
    ui.deleteButton.setOnClickListener {
        onDelete(product)
    }
}}

----ViewModel----

class ProductListViewModel @Inject constructor(val productInteractor: WoodProductInteractor) : ViewModel() {
val productsData = MutableLiveData<List<WoodProduct>>()
val productData = MutableLiveData<WoodProduct>()

private val numberFormat = DecimalFormat("###.##")

suspend fun loadProducts(treeId: Int) {
    val products = GlobalScope.async(Dispatchers.IO) { productInteractor.getWoodProducts(treeId) }.await()
    GlobalScope.launch(Dispatchers.Main) { productsData.value = products }
    Log.d("Data","Log Product = $productsData")
}

Answer 1

Waitting for answers