Android Kotlin - ListView

Afluentes: Programação para Dispositivos Móveis

• Crie uma Activity Empty com:
  • LinearLayout
    • 1 campos PlainText (editText)
    • 1 botão (button)
    • 1 ListView (listView)

MainActivity.kt

package com.example.mylistview

import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.widget.ArrayAdapter
import android.widget.Button
import android.widget.EditText
import android.widget.ListView

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val editText : EditText = findViewById(R.id.editText)
        val button : Button = findViewById(R.id.button)
        val listView : ListView = findViewById(R.id.listView)

        val list = ArrayList<String>()
        val adapter = ArrayAdapter(this,
            android.R.layout.simple_list_item_1, list)
        listView.adapter = adapter

        button.setOnClickListener {
            val text : String = editText.text.toString()
            if (text != "") {
                list.add(text)
                adapter.notifyDataSetChanged()
                editText.setText("")
                editText.requestFocus()
            }
        }

        listView.setOnItemClickListener { parent, view, position, id ->
            editText.setText(list.get(position))
        }

        listView.setOnItemLongClickListener { parent, view, position, id ->
            list.removeAt(position)
            adapter.notifyDataSetChanged()
            true
        }
    }
}

Exercício

Fazer uma listView com layout customizado, com mais de um elemento.