In this article, we will learn about android ImageFilterButton using Kotlin. We will go through various example that demonstrates how to use different attributes of ImageFilterButton. For example,

In this article, we will get answer to questions like –

• What is ImageFilterButton?
• Why should we consider ImageFilterButton while designing ui for any app?
• What are possibilities using ImageFilterButton while designing ui? etc.

Let’s have a quick demo of things we want to cover in this tutorial –

Output

Getting Started

We can define android ImageFilterButton widget as below –

ImageFilterButton is subclass of AppCompatImageButton that can display, combine and filter images.

In our application, we are going to combine two images and show it one above other. In other words, we are going to learn how can we show any image as background or foreground for other image.

Now, how do we use ImageFilterButton in android application ?

Creating New Project

At first, we will create an application.
So, follow steps below to create any android project in Kotlin –

Newbie in Android ?

Some very important concepts (Recommended to learn before you move ahead)

• Install Android Studio
• Create New Project in Android Studio
• Android Project Structure
• Run / Debug / Test Android App

Before we move ahead, we need to setup for viewBinding to access Android ImageFilterButton Using Kotlin file without using findViewById() method.

Setup ViewBinding

Add viewBinding true in app/build.gradle file.

 
 android { 
 	// OTHER CODE... 
 	buildFeatures { 
 		viewBinding true 
 	} 
 } 
 

Now, set content in activity using view binding.
Open MainActivity.kt file and write below code in it.

 
 class MainActivity : AppCompatActivity() { 
 	
 	private lateinit var binding: ActivityMainBinding 
 	
 	override fun onCreate(savedInstanceState: Bundle?) { 
 		super.onCreate(savedInstanceState) 
 		binding = ActivityMainBinding.inflate(layoutInflater) 
 		val view = binding.root 
 		setContentView(view) 
 	} 
 } 
 

Now, we can access view in Kotlin file without using findViewById() method.

Using ImageFilterButton in Kotlin

Follow steps below to use ImageFilterButton in newly created project –

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

  <resources>
      <string name="app_name">ImageFilterButton</string>
      <string name="saturation">Saturation</string>
      <string name="crossFade">CrossFade</string>
  </resources>
  

• Open res/layout/activity_main.xml file. Then, add below code in it –

  <?xml version="1.0" encoding="utf-8"?>
  <androidx.constraintlayout.widget.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"
      android:padding="10dp"
      tools:context=".MainActivity">
  
      <androidx.constraintlayout.utils.widget.ImageFilterButton
          android:id="@+id/imageFilterButton"
          android:layout_width="0dp"
          android:layout_height="wrap_content"
          android:layout_marginStart="8dp"
          android:layout_marginTop="8dp"
          android:layout_marginEnd="8dp"
          android:src="@drawable/garden"
          app:altSrc="@drawable/ic_launcher_foreground"
          app:crossfade="0"
          app:layout_constraintEnd_toEndOf="parent"
          app:layout_constraintStart_toStartOf="parent"
          app:layout_constraintTop_toTopOf="parent"
          tools:srcCompat="@tools:sample/avatars" />
  
      <TextView
          android:id="@+id/crossFade_key"
          android:layout_width="70dp"
          android:layout_height="wrap_content"
          android:layout_marginTop="20dp"
          android:text="@string/crossFade"
          app:layout_constraintStart_toStartOf="parent"
          app:layout_constraintTop_toBottomOf="@+id/imageFilterButton" />
  
      <SeekBar
          android:id="@+id/crossFadeSeekBar"
          android:layout_width="0dp"
          android:layout_height="wrap_content"
          android:layout_marginTop="20dp"
          app:layout_constraintEnd_toEndOf="parent"
          app:layout_constraintStart_toEndOf="@+id/crossFade_key"
          app:layout_constraintTop_toBottomOf="@+id/imageFilterButton" />
  
  </androidx.constraintlayout.widget.ConstraintLayout>
  

  Here, we have used Android SeekBar to change value of crossFade for imageFilterView. By increasing value, we will change visibility status of image set using app:altSrc=”” attribute.

• We can also access it in Kotlin File, MainActivity.kt, as below –

  package com.tutorialwing.imagefilterbutton
  
  import androidx.appcompat.app.AppCompatActivity
  import android.os.Bundle
  import android.widget.SeekBar
  import com.tutorialwing.imagefilterbutton.databinding.ActivityMainBinding
  
  class MainActivity : AppCompatActivity() {
  
  	private lateinit var binding: ActivityMainBinding
  
  	override fun onCreate(savedInstanceState: Bundle?) {
  		super.onCreate(savedInstanceState)
  
  		binding = ActivityMainBinding.inflate(layoutInflater)
  		setContentView(binding.root)
  
  		setupCrossFadeSeekbar()
  	}
  
  	private fun setupCrossFadeSeekbar() {
  		binding.crossFadeSeekBar.setOnSeekBarChangeListener(object :
  			SeekBar.OnSeekBarChangeListener {
  			override fun onProgressChanged(seekbar: SeekBar?, progress: Int, p2: Boolean) {
  				val percentage = (progress / 100.0f)
  				binding.imageFilterButton.crossfade = (percentage)
  			}
  
  			override fun onStartTrackingTouch(seekbar: SeekBar?) {
  			}
  
  			override fun onStopTrackingTouch(seekbar: SeekBar?) {
  			}
  		})
  	}
  }
  

  Inside setupCrossFadeSeekbar() method, we have set seekBar change listener to SeekBar having id crossFadeSeekBar . Whenever any value is changed, crossfade value of ImageFilterButton changes.

Now, run the application. We will get output as below –

Different Attributes of ImageFilterButton in XML

Now, we will see how to use different attributes of Android ImageFilterButton using Kotlin to customise it –

Set Id of ImageFilterButton

Many a time, we need id of View to access it in kotlin file or create ui relative to that view in xml file. So, we can set id of ImageFilterButton using android:id attribute like below –

    <androidx.constraintlayout.utils.widget.ImageFilterButton
        android:id="@+id/imageFilterButton_ID"
        />

Here, we have set id of ImageFilterButton as imageFilterButton_ID using android:id=”” attribute. So, if we need to reference this ImageFilterButton, we need to use this id – imageFilterButton_ID.

Set Width of ImageFilterButton

We use android:layout_width=”” attribute to set width of ImageFilterButton.
We can do it as below –

    <androidx.constraintlayout.utils.widget.ImageFilterButton
        android:id="@+id/imageFilterButton_ID"
        android:layout_width="wrap_content"
        />

Width can be either “MATCH_PARENT” or “WRAP_CONTENT” or any fixed value (like 20dp, 30dp etc.).

Set Height of ImageFilterButton

We use android:layout_height=”” attribute to set height of ImageFilterButton.
We can do it as below –

    <androidx.constraintlayout.utils.widget.ImageFilterButton
        android:id="@+id/imageFilterButton_ID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />

Height can be either “MATCH_PARENT” or “WRAP_CONTENT” or any fixed value.

Set Padding of ImageFilterButton

We use android:padding=”” attribute to set padding of ImageFilterButton.
We can do it as below –

    <androidx.constraintlayout.utils.widget.ImageFilterButton
        android:id="@+id/imageFilterButton_ID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="10dp"
        />

Here, we have set padding of 10dp in ImageFilterButton using android:padding=”” attribute.

Set Margin of ImageFilterButton

We use android:layout_margin=”” attribute to set margin of ImageFilterButton.
We can do it as below –

    <androidx.constraintlayout.utils.widget.ImageFilterButton
        android:id="@+id/imageFilterButton_ID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        />

Here, we have set margin of 10dp in ImageFilterButton using android:layout_margin=”” attribute.

Set Background of ImageFilterButton

We use android:background=”” attribute to set background of ImageFilterButton.
We can do it as below –

    <androidx.constraintlayout.utils.widget.ImageFilterButton
        android:id="@+id/imageFilterButton_ID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#ff0000"
        />

Here, we have set background of color #ff0000 in ImageFilterButton using android:background=”” attribute.

Set Visibility of ImageFilterButton

We use android:visibility=”” attribute to set visibility of ImageFilterButton.
We can do it as below –

    <androidx.constraintlayout.utils.widget.ImageFilterButton
        android:id="@+id/imageFilterButton_ID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:visibility="gone"
        />

Here, we have set visibility of ImageFilterButton using android:visibility=”” attribute. Visibility can be of three types – gone, visible and invisible

Thus, we have seen what is ImageFilterButton, how can we use android ImageFilterButton using Kotlin ? etc. We also went through different attributes of android ImageFilterButton.