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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 –
Sr. | XML Attributes | Description |
---|---|---|
1 | android:adjustViewBounds | Responsible for auto adjust of view’s boundary to maintain the aspect ratio of it’s drawable. |
2 | android:baseline | Defines offset of the baseline within this view. |
3 | android:baselineAlignBottom | If true, it sets the baseline aligned with it’s bottom edge. |
4 | android:cropToPadding | If true, image will be cropped to fit within it’s padding. |
5 | android:maxHeight | Defines maximum height of the view. |
6 | android:maxWidth | Defines maximum width of the view. |
7 | android:scaleType | Specifies the way image will be resized or moved to match the size of the imageView |
8 | android:src | Defines a drawable of the imageView |
9 | android:tint | It tints the color of the image. |
10 | android:tintMode | Specifies blending mode used to apply the image tint |
Some of the popular attributes of ImageButton inherited from View are –
Sr. | XML Attributes | Description |
---|---|---|
1 | android:alpha | Defines alpha of the view |
2 | android:autofillHints | Defines the data to be shown to auto fill in the view |
3 | android:background | Defines background of the view |
4 | android:backgroundTint | Defines tint to apply to the background |
5 | android:backgroundTintMode | Specifies Blending mode used to apply the background tint |
6 | android:clickable | Defines whether this view is clickable or not |
7 | android:elevation | Specifies elevation to the view |
8 | android:fitsSystemWindows | It is used to adjust view layout based on system windows |
9 | android:focusable | Defines whether this view can take focus |
10 | android:id | Defines unique id to the view |
11 | android:onClick | Specifies what to do when this view is clicked |
12 | android:padding | Defines padding to the view |
13 | android:tag | Defines tag to the view |
14 | android:tooltipText | Specifies tooltip text to be shown when hovered on the view |
15 | android:visibility | Defines visibility of the view |
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.
Step | Description |
---|---|
1. | Open Android Studio. |
2. | Go to File => New => New Project. Write application name as ImageButton. Then, check Include Kotlin Support and click next button. |
3. | Select minimum SDK you need. However, we have selected 17 as minimum SDK. Then, click next button |
4. | Then, select Empty Activity => click next => click finish. |
5. | You will get a newly created project successfully if you have followed steps properly. |
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.