Styjun

I have a Fragment containing a list of strings (company names) which works with SearchView. However, due to many companies having long names, is there a way where I can type in an abbreviation for a company name rather than having to type in the whole company name? 'FTSE 150' and 'FTSE 250' are self-explanatory hence don't need abbereviations.

Abberviations for company names

• GSK - GlaxoSmithKline plc


• HSX - Hiscox Ltd


• IHG - InterContinental
  Hotels Group plc


• MKS - Marks & Spencer Group plc

strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
 <string-array name="company_names">
 <item>@string/glaxosmithkline_plc</item>
 <item>@string/hiscox_ltd</item>
 <item>@string/intercontinental_hotels_group_plc</item>
 <item>@string/marks_and_spencer_group_plc</item>
 <item>@string/ftse_150</item>
 <item>@string/ftse_250</item>
 </string-array>

 <string name="glaxosmithkline_plc">GlaxoSmithKline plc</string>
 <string name="hiscox_ltd">Hiscox Ltd</string>
 <string name="intercontinental_hotels_group_plc">InterContinental Hotels Group plc</string>
 <string name="marks_and_spencer_group_plc">Marks &amp; Spencer Group plc</string>
 <string name="ftse_150">FTSE 150</string>
 <string name="ftse_250">FTSE 250</string>
</resources>

fragment class

class MyFragment : androidx.fragment.app.Fragment() 

 private var mAdapter: MyListAdapter? = null

 private lateinit var mRecyclerView: androidx.recyclerview.widget.RecyclerView

 private var mTwoPane: Boolean = false

 override fun onCreate(savedInstanceState: Bundle?) 
 super.onCreate(savedInstanceState)
 setHasOptionsMenu(true)
 

 override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? 
 val view = inflater.inflate(R.layout.layout_recyclerview, container, false)
 mTwoPane = (activity as androidx.fragment.app.FragmentActivity).findViewById<View>(R.id.detail_container) != null

 mRecyclerView = view.findViewById(R.id.recyclerView_list)
 mRecyclerView.setHasFixedSize(true)
 mRecyclerView.layoutManager = androidx.recyclerview.widget.LinearLayoutManager(this.activity)
 mRecyclerView.addItemDecoration(androidx.recyclerview.widget.DividerItemDecoration(Objects.requireNonNull<Context>(context), LinearLayout.VERTICAL))

 val myList = ArrayList<Companies>()

// val items = resources.getStringArray(R.array.company_names)
// for (n in items) 
// val company = Companies(0, "", "")
// myList.add(company)
// 

 val companyA = Companies(1, "GlaxoSmithKline plc", "GSK")
 val companyB = Companies(2, "Hiscox Ltd", "HSX")
 val companyC = Companies(3, "InterContinental Hotels Group plc", "IHG")
 val companyD = Companies(4, "Marks & Spencer Group plc", "MKS")
 val companyE = Companies(5, "FTSE 150", "")
 val companyF = Companies(6, "FTSE 250", "")

 val myList = DatabaseHandler(this.context!!)
 myList.insertData(companyA)
 myList.insertData(companyB)
 myList.insertData(companyC)
 myList.insertData(companyD)
 myList.insertData(companyE)
 myList.insertData(companyF)

 mAdapter = MyListAdapter(activity!!, myList, mTwoPane)

 mRecyclerView.adapter = mAdapter

 return view
 

 override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) 
 val mInflater = Objects.requireNonNull<androidx.fragment.app.FragmentActivity>(activity).menuInflater
 mInflater.inflate(R.menu.menu_search, menu)

 val searchView = searchitem.actionView as SearchView

 searchView.setOnQueryTextListener(object : SearchView.OnQueryTextListener 
 override fun onQueryTextSubmit(query: String): Boolean 
 return false
 

 override fun onQueryTextChange(newText: String): Boolean 
 mAdapter!!.filter.filter(newText)
 return false
 
 )

 super.onCreateOptionsMenu(menu, inflater)
 

MyListAdapter class

class MyListAdapter(private val mCtx: Context, private val myList: MutableList<Companies>,
 private val
mTwoPane: Boolean) : androidx.recyclerview.widget.RecyclerView.Adapter<MyListAdapter
.CompanyViewHolder>(), Filterable 
 private var myListFull = myList.toMutableList()

 private val companyFilter = object : Filter() 
 override fun performFiltering(constraint: CharSequence?): Filter.FilterResults 
 val filteredList = ArrayList<Companies>()

 when 
 constraint == null 

 val results = Filter.FilterResults()
 results.values = filteredList
 return results
 

 override fun publishResults(constraint: CharSequence?, results: Filter.FilterResults?) 
 myList.clear()
 myList.addAll(results!!.values as List<Companies>)
 notifyDataSetChanged()
 
 

 inner class CompanyViewHolder(itemView: View) : androidx.recyclerview.widget.RecyclerView
 .ViewHolder(itemView) 
 var tvTitle: TextView = itemView.findViewById(R.id.tv_RVItem)
 

 override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): CompanyViewHolder 
 val inflater = LayoutInflater.from(mCtx)
 val v = inflater.inflate(R.layout.recyclerview_item_textview, parent, false)
 return CompanyViewHolder(v)
 

 override fun onBindViewHolder(holder: CompanyViewHolder, position: Int) 
 val product = myList[holder.adapterPosition]

 holder.tvTitle.text = product.companyfuName
 

 override fun getItemCount(): Int 
 return myList.size
 

 override fun getFilter(): Filter 
 return companyFilter
 

UPDATES

Custom model class

data class Companies (val id: String, val fullName: String, val abbreviation: String)

updated Adapter class

class MyListAdapter(private val mCtx: Context,
 private val mCompanies: MutableList<Companies>,
 private val mTwoPane: Boolean) : androidx.recyclerview.widget.RecyclerView.Adapter<MyListAdapter
.CompanyViewHolder>(), Filterable 
 private val mCompaniesFull = mCompanies.toMutableList()

 private val companyFilter = object : Filter() 
 override fun performFiltering(constraint: CharSequence?): Filter.FilterResults 
 val filteredList = if (constraint == null 

 override fun publishResults(constraint: CharSequence?, results: Filter.FilterResults?) 
 mCompanies.clear()
 mCompanies.addAll(results!!.values as List<Companies>)
 notifyDataSetChanged()
 
 

 private fun String.matchesIgnoreCase(otherString: String): Boolean 
 return this.toLowerCase().contains(otherString.trim().toLowerCase())
 

 inner class CompanyViewHolder(itemView: View) : androidx.recyclerview.widget.RecyclerView
 .ViewHolder(itemView) 
 var tvTitle: TextView = itemView.findViewById(R.id.tv_RVItem)
 

 override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): CompanyViewHolder 
 val inflater = LayoutInflater.from(mCtx)
 val v = inflater.inflate(R.layout.recyclerview_item_textview, parent, false)
 return CompanyViewHolder(v)
 

 override fun onBindViewHolder(holder: CompanyViewHolder, position: Int) 
 val product = mCompanies[holder.adapterPosition]
 holder.tvTitle.text = product.companyName
 

 override fun getItemCount(): Int 
 return mCompanies.size
 

 override fun getFilter(): Filter 
 return companyFilter
 

updated Fragment class

class MonFragment : androidx.fragment.app.Fragment() 

 private var mAdapter: MyListAdapter? = null

 private lateinit var mRecyclerView: androidx.recyclerview.widget.RecyclerView

 private var mTwoPane: Boolean = false

 override fun onCreate(savedInstanceState: Bundle?) 
 super.onCreate(savedInstanceState)
 setHasOptionsMenu(true)
 

 override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? 
 val view = inflater.inflate(R.layout.layout_recyclerview, container, false)
 mTwoPane = (activity as androidx.fragment.app.FragmentActivity).findViewById<View>(R.id.detail_container) != null

 mRecyclerView = view.findViewById<RecyclerView>(R.id.recyclerView_list)
 mRecyclerView.setHasFixedSize(true)
 mRecyclerView.layoutManager = androidx.recyclerview.widget.LinearLayoutManager(this.activity)
 mRecyclerView.addItemDecoration(androidx.recyclerview.widget.DividerItemDecoration(Objects.requireNonNull<Context>(context), LinearLayout.VERTICAL))

 mCompanies.add(Companies("GlaxoSmithKline plc", "GSK"))
 mCompanies.add(Companies("Hiscox Ltd", "HSX"))
 mCompanies.add(Companies("InterContinental Hotels Group plc", "IHG"))
 mCompanies.add(Companies("Marks & Spencer Group plc", "MKS"))
 mCompanies.add(Companies("FTSE 150", ""))
 mCompanies.add(Companies("FTSE 250", ""))

 mAdapter = MyListAdapter(activity!!, mCompanies, mTwoPane)

 mRecyclerView.adapter = mAdapter

 return view
 

 override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) 
 val mInflater = Objects.requireNonNull<androidx.fragment.app.FragmentActivity>(activity).menuInflater
 mInflater.inflate(R.menu.menu_search, menu)

 val searchitem = menu.findItem(R.id.action_search)
 val searchView = searchitem.actionView as SearchView

 searchView.setOnQueryTextListener(object : SearchView.OnQueryTextListener 
 override fun onQueryTextSubmit(query: String): Boolean 
 return false
 

 override fun onQueryTextChange(newText: String): Boolean 
 mAdapter!!.filter.filter(newText)
 mAdapter!!.notifyDataSetChanged()

 return false
 
 )

 super.onCreateOptionsMenu(menu, inflater)
 

Following the discussion in comments I'd suggest two approaches for storing the data:

1. Device storage either with SharedPreferences or databases: SQLite, Room (they are lightweight local storage databases, Internet connection is not needed).


2. Device memory (not recommended) as a List of hardcoded objects initialized either in MainActivity or Fragment's onCreate method (dependent on the usage).

As @CoolMind suggested you should implement a custom model class CompanyName(id, fullName, abbreviation) and then filter by the alternative of fullName and abbreviation.

EDIT:
In MyListAdapter get rid of myListFull as it does nothing and put:

private val stockFilter = object : Filter() 
 override fun performFiltering(constraint: CharSequence?): Filter.FilterResults 

Also add in the MyListAdapter class this extension function:

private fun String.matchesIgnoreCase(otherString: String): Boolean 
 return this.toLowerCase().contains(otherString.trim().toLowerCase())