Display List View in Android
A list view is a scrollable list that displays a list of items.
A ListView class is used to create a list view. It is empty and requires an adapter that provides data from source.
app/src/main/res/layout/activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<ListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
Using arrayOf() function we create an array that contains a list of items. An ArrayAdapter converts a list of items into View items. A simple_list_item_1 is an built-in XML layout file that contains single TextView.
The setOnItemClickListener() method registers a callback. It will be invoked when an item was clicked. We use getItemAtPosition() method to get the item associated with the specified position in the list.
app/src/main/java/com/example/app/MainActivity.kt
package com.example.app
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.widget.ArrayAdapter
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity()
{
override fun onCreate(savedInstanceState: Bundle?)
{
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val items: Array<String> = arrayOf("Yellow", "Green", "Red", "Blue")
val adapter: ArrayAdapter<String> = ArrayAdapter(
this,
android.R.layout.simple_list_item_1,
items
)
listView.adapter = adapter
listView.setOnItemClickListener { parent, view, position, id ->
val item: String = listView.getItemAtPosition(position).toString()
Log.d("MY_APP", item)
}
}
}
