How to Implement Fab Explosion Animation in Android?
Last Updated : 04 Jul, 2023
When interacting with apps on our devices, animations add delight to the user's experience and create a sense of connection between the vibrant destinations. One of the animations on Android which enhances the user's experience is the FAB (Floating Action Button) Explosion Animation. Here, the user clicks the FAB and it explodes to fill the whole screen, with the following screen being loaded. Before the explosion, the FAB shrinks a small amount to account for the press from the user- this coupled with the explosion, creates a pleasant journey to the next screen. A sample video is given below to get an idea about what we are going to do in this article.
Step-by-Step Implementation
Step 1: Create a New Project in Android Studio
To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. Note that select Kotlin as the programming language.
Step 2: Navigate to the Gradle Scripts > build.gradle(Module:app) and enables ViewBinding by adding the given code above BuildTypes and Sync the project by clicking on Sync Now option appearing in the top right corner.
buildFeatures {
viewBinding true
}
Now update SDK Version and Sync the project by clicking on Sync Now option appearing in the top right corner.
android {
compileSdkVersion 31
buildToolsVersion "30.0.2"
defaultConfig {
applicationId "com.plcoding.fabexplosionanimation"
minSdkVersion 21
targetSdkVersion 31
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
Step 3: Add the FAB Icons to the Drawable File. Right-click on the drawable folder > New > Vector Asset. Add choose a vector asset of your choice.
Step 4: Navigate to the res< drawable, right-click on drawable, and choose New > Drawable Resource File. Change the file name to a circle and add the below code.
XML <?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval"> <solid android:color="@color/purple_500" /> </shape>
Step 5: Working with the activity_main.xml file
Navigate to the app > res > layout > activity_main.xml and add the below code to that file. Below is the code for the activity_main.xml file. Comments are added inside the code to understand the code in more detail.
XML <?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" tools:context=".MainActivity"> <com.google.android.material.floatingactionbutton.FloatingActionButton android:id="@+id/fab" android:layout_width="wrap_content" android:layout_height="wrap_content" android:backgroundTint="@color/purple_500" android:src="@drawable/ic_baseline_baby_changing_station_24" android:layout_marginEnd="16dp" android:layout_marginBottom="16dp" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:tint="@color/white" /> <View android:id="@+id/circle" android:layout_width="64dp" android:layout_height="64dp" android:background="@drawable/circle" android:visibility="invisible" app:layout_constraintBottom_toBottomOf="@+id/fab" app:layout_constraintEnd_toEndOf="@+id/fab" app:layout_constraintStart_toStartOf="@+id/fab" app:layout_constraintTop_toTopOf="@+id/fab" /> </androidx.constraintlayout.widget.ConstraintLayout>
Step 6: Right-click on the res > New > Drawable Resource File. Choose the Resource Type as Animation and the file name as circle_explosion_anim.
Resource file for explosion animationAdd the below code in the Resource file.
XML <?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android"> <scale android:pivotX="50%" android:pivotY="50%" android:fromXScale="0" android:fromYScale="0" android:toXScale="40" android:toYScale="40" /> </set>
Step 7: Create a new Kotlin Class and name it ViewExt and refer to the below code to it.
Kotlin package com.plcoding.fabexplosionanimation import android.view.View import android.view.animation.Animation fun View.startAnimation(animation: Animation, onEnd: () -> Unit) { animation.setAnimationListener(object : Animation.AnimationListener { override fun onAnimationStart(animation: Animation?) = Unit override fun onAnimationEnd(animation: Animation?) { onEnd() } override fun onAnimationRepeat(animation: Animation?) = Unit }) this.startAnimation(animation) } Step 8: Working with the MainActivity.kt file
Go to the MainActivity.java file and refer to the following code. Below is the code for the MainActivity.java file. Comments are added inside the code to understand the code in more detail.
Kotlin package com.plcoding.fabexplosionanimation import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.view.animation.AccelerateDecelerateInterpolator import android.view.animation.AnimationUtils import androidx.core.content.ContextCompat import androidx.core.view.isVisible import com.plcoding.fabexplosionanimation.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) val animation = AnimationUtils.loadAnimation(this, R.anim.circle_explosion_anim).apply { duration = 700 interpolator = AccelerateDecelerateInterpolator() } binding.fab.setOnClickListener { binding.fab.isVisible = false binding.circle.isVisible = true binding.circle.startAnimation(animation) { // display your fragment binding.root.setBackgroundColor(ContextCompat.getColor(this, R.color.purple_500)) binding.circle.isVisible = false } } } } Output:
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