How to add a custom adapter to an AutoCompleteTextView

Question

Is there any simple way to set a 2 TextView dropdown to an AutoCompleteTextView.

There is android.R.layout.two_line_list_item Which I couldn\'t find any exa

Answer 1

Converted Dwivedi Ji's answer to Kotlin. I had some issue with Android Studio's auto convert. Thus, spent some time to make it work.

Now it is working. In case anyone needs it (in my case, I am filtering street names):

class StreetsAdapter( private val mContext: Context,
                      private val viewResourceId: Int,
                      private val items: ArrayList) : ArrayAdapter(mContext, viewResourceId, items.toList()) {

    private val itemsAll = items.clone() as ArrayList
    private var suggestions = ArrayList()

    override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {
        var v: View? = convertView
        if (v == null) {
            val vi = mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
            v = vi.inflate(viewResourceId, null)
        }
        val street: Street? = items[position]
        if (street != null) {
            val streetTitle = v?.findViewById(R.id.tvStreetTitle) as TextView?
            streetTitle?.text = street.title
        }
        return v!!
    }

    override fun getFilter(): Filter {
        return nameFilter
    }

    private var nameFilter: Filter = object : Filter() {
        override fun convertResultToString(resultValue: Any): String {
            return (resultValue as Street).title
        }

        override fun performFiltering(constraint: CharSequence?): FilterResults {
            return if (constraint != null) {
                suggestions.clear()
                for (street in itemsAll) {
                    if (street.title.toLowerCase().startsWith(constraint.toString().toLowerCase())) {
                        suggestions.add(street)
                    }
                }
                val filterResults = FilterResults()
                filterResults.values = suggestions
                filterResults.count = suggestions.size
                filterResults
            } else {
                FilterResults()
            }
        }

        override fun publishResults(constraint: CharSequence?, results: FilterResults?) {
            val filteredList =  results?.values as ArrayList?

            if (results != null && results.count > 0) {
                clear()
                for (c: Street in filteredList ?: listOf()) {
                    add(c)
                }
                notifyDataSetChanged()
            }
        }
    }
}

And set your adapter:

val adapter = StreetsAdapter(this,
       R.layout.item_street, //Your layout. Make sure it has [TextView] with id "tvStreetTitle" 
       arrayListOf() //Your list goes here
)
autoTextView.threshold = 1 //will start working from first character
autoTextView.setAdapter(adapter)