Why the spinner function cannot select item?

Question

I have faced a problem which my spinner cannot show the item selected in the page. But for the selection of "All", it can show normally all item but when I click one of the selection in spinner, it will show nothing for me no matter the selection name is match with job name or not. Can some one help me?

override fun onResume() {
        super.onResume()
        val places=resources.getStringArray(R.array.place)
        val arrayAdapter=ArrayAdapter(requireContext(),R.layout.dropdown_item,places)

        val jobs=resources.getStringArray(R.array.job)
        val arrayAdapter2=ArrayAdapter(requireContext(),R.layout.dropdown_item,jobs)

        binding.spinnerPlace.setAdapter(arrayAdapter)
        binding.spinnerJob.setAdapter(arrayAdapter2)

        spinner_job.onItemSelectedListener=object : AdapterView.OnItemSelectedListener{
            override fun onItemSelected(
                parent: AdapterView<*>?,
                view: View?,
                position: Int,
                id: Long
            ) {
                if (parent != null) {
                    if(parent.getItemAtPosition(position)=="All"){
                        tempArrayList.addAll(newArrayList)
                        val adapter=Search_Page_Adapter(requireContext(),tempArrayList)
                        newRecyclerView.adapter=adapter
                        newRecyclerView.layoutManager=LinearLayoutManager(requireContext())

                    }

                    else{
                        tempArrayList.clear()
                        val item=parent.getItemAtPosition(position).toString()
                       Toast.makeText(parent.context,"Selected:$item",Toast.LENGTH_SHORT).show()
                        if(item.isNotEmpty()){
                            newArrayList.forEach{
                                if(it.jobname?.lowercase(Locale.getDefault())!!.contains(item)){
                                    tempArrayList.add(it)
                                }
                                val adapter=Search_Page_Adapter(requireContext(),tempArrayList)
                                newRecyclerView.adapter=adapter
                                newRecyclerView.layoutManager=LinearLayoutManager(requireContext())
                            }
                        }else{
                            tempArrayList.clear()
                            tempArrayList.addAll(newArrayList)
                            newRecyclerView.adapter!!.notifyDataSetChanged()
                        }

                    }
                }
            }

            override fun onNothingSelected(parent: AdapterView<*>?) {
                TODO("Not yet implemented")
            }

        }
        
    }

Answer 1

Try to change your onItemSelectedListener logic:

        spinner_job.onItemSelectedListener=object : AdapterView.OnItemSelectedListener{
            override fun onItemSelected(
                parent: AdapterView<*>?,
                view: View?,
                position: Int,
                id: Long
            ) {
                val item = parent.getItemAtPosition(position).toString()
                if(item == "All") {
                    // `All` selected
                    tempArrayList.addAll(newArrayList)
                    val adapter=Search_Page_Adapter(requireContext(),tempArrayList)
                    newRecyclerView.adapter=adapter
                    newRecyclerView.layoutManager=LinearLayoutManager(requireContext())
                }
                else {
                    // Others selected
                    Toast.makeText(parent.context,"Selected:$item",Toast.LENGTH_SHORT).show()
                    if(item.isNotEmpty()){
                        newArrayList.forEach{
                            if(it.jobname?.lowercase(Locale.getDefault())!!.contains(item)){
                                tempArrayList.add(it)
                            }
                            val adapter=Search_Page_Adapter(requireContext(),tempArrayList)
                            newRecyclerView.adapter=adapter
                            newRecyclerView.layoutManager=LinearLayoutManager(requireContext())
                        }
                    } else {
                        tempArrayList.clear()
                        tempArrayList.addAll(newArrayList)
                        newRecyclerView.adapter!!.notifyDataSetChanged()
                    }
                }
            }

            override fun onNothingSelected(parent: AdapterView<*>?) {
                TODO("Not yet implemented")
            }