Hello Readers! In this post, we are going to learn about android imageButton using kotlin in any android application. We will also learn about different attributes of android imageButton that can be used to customise this widget.

Output

Tutorialwing Kotlin ImageButton Output

Getting Started

Android ImageButton can be defined as below –

ImageButton is a subclass of imageView that displays a button with image that can be clicked or pressed by user.

By default, it acts as button. However, you can set image using android:src attribute.

Different Attributes of Android imageButton Widget

Some of the popular attributes of imageButton inherited from imageView are –

Some of the popular attributes of ImageButton inherited from View are –

Example of Android ImageButton Using Kotlin

At first, we will create android application. Then, we will use imageButton using kotlin in the application.

1. Creating New Project in Kotlin

Follow steps below to create new project. Please ignore the steps if you have already created the project.

Since we have a project now, we will modify xml and other files to use imageButton using kotlin in the application.

2. Modify values folder

Open res/values/strings.xml file. Then, add below code into it.

<resources>
	<string name="app_name">ImageButton</string>
	<string name="this_is_imagebutton">This is imageButton</string>
	<string name="image_button_clicked">You clicked imageButton</string>
</resources>

3. Use ImageButton Widget in xml file

Open src/main/res/layout/activity_main.xml file and add below code into it.

<?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:gravity="center">

	<ImageButton
		android:id="@+id/imageButton"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:contentDescription="@string/this_is_imagebutton"
		app:srcCompat="@mipmap/ic_launcher"/>

</LinearLayout>

In activity_main.xml file, we have defined imageButton widget. Notice the two attributes android:contentDescription and app:srcCompat . First one is being used to set an description to the image that will be shown when there is no image found. Second one is used to set image resource to the imageButton. Now, we will access this imageButton using kotlin file in the application.

4. Access ImageButton Widget in Kotlin file

Open src/main/java/com.tutorialwing.imagebutton/MainActivity.kt file and add below code into it.

package com.tutorialwing.imagebutton

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.widget.ImageButton
import android.widget.Toast

class MainActivity : AppCompatActivity() {

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

        val imageButton = findViewById<ImageButton>(R.id.imageButton)
        imageButton?.setOnClickListener { Toast.makeText(this@MainActivity, R.string.image_button_clicked, Toast.LENGTH_SHORT).show() }
    }
}

In MainActivity.kt file, we have accessed ImageButton widget. Then, we have set a click listener to it. On click, it will display a toast message.

Since AndroidManifest.xml file is very important in any android application, we are also going to see the content inside this file.

AndroidManifest.xml file

Code inside main/AndroidManifest.xml file is as below.

<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.tutorialwing.imagebutton"
		  xmlns:android="http://schemas.android.com/apk/res/android">

	<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">
		<activity android:name=".MainActivity">
			<intent-filter>
				<action android:name="android.intent.action.MAIN"/>

				<category android:name="android.intent.category.LAUNCHER"/>
			</intent-filter>
		</activity>
	</application>

</manifest>

When we run the program, we will get output as shown above.

That’s end of our tutorial on Android imageButton using kotlin.