ImageButton in Kotlin

28 Mar, 2022
Android ImageButton is a user interface widget which is used to display a button having image and to perform exactly like button when we click on it but here, we add an image on Image button instead of text. There are different types of buttons available in android like ImageButton, ToggleButton etc.
We can add an image to the button simply by using attribute android:src in activity_main.xml file or by using setImageResource() method.
In android, we can create ImageButton control in two ways either manually or programmatically.
First we create a new project by following the below steps:
Click on File, then New => New Project.After that include the Kotlin support and click on next.Select the minimum SDK as per convenience and click next button.Then select the Empty activity => next => finish.
Click on File, then New => New Project.
After that include the Kotlin support and click on next.
Select the minimum SDK as per convenience and click next button.
Then select the Empty activity => next => finish.
In this file, we include the Edittext and ImageButton and set their attributes like id, layout_width, hint etc.
XML
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:id="@+id/linear_layout">      <EditText        android:id="@+id/Num1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginLeft="50dp"        android:ems="10"        android:hint= "Enter first number"/>      <EditText        android:id="@+id/Num2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginLeft="50dp"        android:ems="10"        android:hint= "Enter second number"/>      <ImageButton        android:id="@+id/imageBtn"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginLeft="100dp"        android:src="@android:drawable/btn_plus" /></LinearLayout>
Modify the strings.xml file to add application name
XML
<resources>    <string name="app_name">ImageButtonInKotlin</string></resources>
First of all, we declare two variables num1 and num2 for both edittext and access them using the ids.
val num1 = findViewById(R.id.Num1)
val num2 = findViewById(R.id.Num2)

then, we declare variable imgbtn for the ImageButton and set the OnCLickListener to check the filled is empty or not
val imgbtn = findViewById(R.id.imageBtn)
    imgbtn.setOnClickListener {
     if (num1.text.toString().isEmpty() || num2.text.toString().isEmpty()) {
          Toast.makeText(applicationContext,
           "Enter both numbers", Toast.LENGTH_SHORT).show()
    }

Kotlin
package com.geeksforgeeks.myfirstkotlinapp  import android.os.Bundleimport androidx.appcompat.app.AppCompatActivityimport android.widget.EditTextimport android.widget.ImageButtonimport android.widget.Toast    class MainActivity : AppCompatActivity() {    override fun onCreate(savedInstanceState: Bundle?) {        super.onCreate(savedInstanceState)        setContentView(R.layout.activity_main)        val num1 = findViewById<EditText>(R.id.Num1)        val num2 = findViewById<EditText>(R.id.Num2)        val imgbtn = findViewById<ImageButton>(R.id.imageBtn)        imgbtn.setOnClickListener {         if (num1.text.toString().isEmpty() || num2.text.toString().isEmpty()) {              Toast.makeText(applicationContext,                  "Enter both numbers", Toast.LENGTH_SHORT).show()            }            else {                val num1 = Integer.parseInt(num1.text.toString())                val num2 = Integer.parseInt(num2.text.toString())                Toast.makeText(applicationContext,                    "Sum of the numbers = " + (num1 + num2),                    Toast.LENGTH_SHORT).show()            }        }    }}
XML
<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.geeksforgeeks.myfirstkotlinapp">  <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>
 
ayushpandey3july
Android-Button
Kotlin Android
Android
Kotlin
Android
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