android kotlin listview example

In this article, today learn android kotlin listview example. Listview is a set of array adapter. for the more information visit google developer listview

Android ListView displays data vertically with each item positioned below the previous data items. ListView is scrollable. You can use ListView without any issues for displaying a few data items in UI. But for displaying large volumes of data as a list, you need to use to build well-performing apps.

1.MainActivity.kt:

import android.support.v7.app.AppCompatActivity

import android.os.Bundle

import android.widget.Toast

import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

val fruit = arrayOf<String>("Mango","cocunt","apple","Cherry","orange")

val description = arrayOf<String>(

"Mango is fruit",

"cocunt is fruit",

"apple is fruit",

"Cherry is fruit",

"orange is fruit",

)

val imageId = arrayOf<Int>(

R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,

R.drawable.ic_launcher

)

override fun onCreate(savedInstanceState: Bundle?) {

super.onCreate(savedInstanceState)

setContentView(R.layout.activity_main)

val ListAdapter = ListAdapter(this,fruit,description,imageId)

listView.adapter = ListAdapter

listView.setOnItemClickListener(){adapterView, view, position, id ->

val itemAtPos = adapterView.getItemAtPosition(position)

val itemIdAtPos = adapterView.getItemIdAtPosition(position)

Toast.makeText(this, "Click on item at $itemAtPos its item id $itemIdAtPos", Toast.LENGTH_LONG).show()

}

2.activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

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"/>

</android.support.constraint.ConstraintLayout>

3.ListAdapter.kt:

import android.app.Activity

import android.view.View

import android.view.ViewGroup

import android.widget.*

class ListAdapter(private val context: Activity, private val title: Array<String>, private val description: Array<String>, private val imgid: Array<Int>)

: ArrayAdapter<String>(context, R.layout.custom_list, title) {

override fun getView(position: Int, view: View?, parent: ViewGroup): View {

val inflater = context.layoutInflater

val rowView = inflater.inflate(R.layout.custom_list, null, true)

val titleText = rowView.findViewById(R.id.title) as TextView

val imageView = rowView.findViewById(R.id.icon) as ImageView

val subtitleText = rowView.findViewById(R.id.description) as TextView

titleText.text = title[position]

imageView.setImageResource(imgid[position])

subtitleText.text = description[position]

return rowView

}

4.custom_list.xml:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="horizontal">

<LinearLayout

android:orientation="horizontal"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:gravity="center" >

<ImageView

android:id="@+id/icon"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

app:srcCompat="@mipmap/ic_launcher" />

<LinearLayout

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_weight="1"

android:orientation="vertical">

<TextView

android:id="@+id/title"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:text="title"

android:textStyle="bold"

android:layout_marginLeft="15dp"

android:layout_marginStart="15dp"

android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium" />

<TextView

android:id="@+id/description"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:text="description"

android:layout_marginLeft="15dp"

android:layout_marginStart="15dp"

android:layout_marginTop="5dp"

android:textSize="16sp"/>

</LinearLayout>

5.AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.akash.listview">

<application

android:allowBackup="true"

android:icon="@mipmap/ic_launcher"

android:label="@string/app_name"

android:roundIcon="@mipmap/ic_launcher_round"

android:supportsRtl="true"

android:theme="@style/AppTheme">

<intent-filter>

</intent-filter>

</activity>

</application>

</manifest>

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