Android ViewAnimator Using Kotlin With Example

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

Output

Tutorialwing Kotlin ViewAnimator Output Android ViewAnimator Using Kotlin With Example

Tutorialwing Kotlin ViewAnimator Output

Getting Started

Android ViewAnimator can be defined as below –

ViewAnimator is a widget that are used to switch between views using animations.

Different Attributes of Android ViewAnimator Widget

Some of the popular attributes of android ViewAnimator widget are –

Sr. XML Attributes Description
1 android:animateFirstView Specifies whether to animate current view when the viewAnimation is first displayed
2 android:inAnimation Identifier for the animation to use when a view is shown
3 android:outAnimation Identifier for the animation to use when a view is hidden

Some of the popular attributes of android ViewAnimator inherited from FrameLayout are –

Sr. XML Attributes Description
1 android:foregroundGravity Specifies the gravity to apply for foreground drawable
2 android:measureAllChildren Specifies whether to measure all children or just those in VISIBLE or INVISIBLE state when measuring

Some of the popular attributes of android ViewAnimator inherited from ViewGroup are –

Sr. XML Attributes Description
1 android:splitMotionEvents Specifies this viewGroup should split MotionEvents to separate child views during touch event dispatch
2 android:persistentDrawingCache Specifies persistence of the drawing cache
3 android:layoutMode Specifies layout mode of this viewGroup
4 android:layoutAnimation Specifies the layout animation to be used when this viewGroup is laid out for the first time
5 android:clipToPadding Specifies whether the ViewGroup will clip its children and resize (but not clip) any EdgeEffect to its padding, if padding is not zero.

Some of the popular attributes of android ViewAnimator inherited from View are –

Sr. XML Attributes Description
1 android:background Specifies drawable of the background
2 android:backgroundTint Specifies tint to apply to the background
3 android:backgroundTintMode Specifies blending mode to be used to apply tint to the background
4 android:clickable Specifies whether this view is clickable or not
5 android:id Specifies unique id of the view
6 android:onClick Specifies what to do when this view is clicked
7 android:padding Specifies padding of the view
8 android:visibility Specifies visibility(VISIBLE, INVISIBLE or GONE) of the view



Example of Android ViewAnimator Using Kotlin

At first, we will create android application. Then, we will use viewAnimator 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 ViewAnimator. 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 viewAnimator 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">ViewAnimator</string>
	<string name="next">Next</string>
	<string name="prev">Previous</string>
	<string name="item_post_1">Text at position 1</string>
	<string name="item_post_2">Button at position 2</string>
	<string name="item_post_4">Text at positon 4</string>
</resources>

3. Use ViewAnimator 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"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:orientation="vertical">

	<LinearLayout
		android:layout_width="match_parent"
		android:layout_height="wrap_content"
		android:gravity="center"
		android:orientation="horizontal"
		android:padding="10dp">

		<Button
			android:id="@+id/buttonPrev"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:text="@string/prev"/>

		<Button
			android:id="@+id/buttonNext"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:text="@string/next"/>

	</LinearLayout>

	<ViewAnimator
		android:id="@+id/viewAnimator"
		android:layout_width="match_parent"
		android:layout_height="match_parent">

		<TextView
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:layout_gravity="center_horizontal"
			android:text="@string/item_post_1"
			android:textColor="@android:color/holo_red_dark"
			android:textSize="20sp"/>

		<Button
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:layout_gravity="center_horizontal"
			android:text="@string/item_post_2">
		</Button>

		<ImageView
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:layout_gravity="center_horizontal"
			android:src="@mipmap/ic_launcher"/>

		<TextView
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:layout_gravity="center_horizontal"
			android:text="@string/item_post_4"
			android:textColor="@android:color/holo_red_dark"
			android:textSize="20sp"/>

	</ViewAnimator>

</LinearLayout>

In activity_main.xml file, we have two buttons and ViewAnimator. ViewAnimator contains four child views(TextView, Button, ImageView and TextView). At a time, only one view is shown in viewAnimator. You can switch between views, using viewAnimator, with animation. Now, we will access these widgets in kotlin file to perform some actions on it.

4. Access ViewAnimator Widget in Kotlin file

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

package com.tutorialwing.viewanimator

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.view.animation.AnimationUtils
import android.widget.Button
import android.widget.ViewAnimator

class MainActivity : AppCompatActivity() {

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

        val animator = findViewById<ViewAnimator>(R.id.viewAnimator)

        val animationIn = AnimationUtils.loadAnimation(this, android.R.anim.slide_in_left)
        val animationOut = AnimationUtils.loadAnimation(this, android.R.anim.slide_out_right)

        animator.inAnimation = animationIn
        animator.outAnimation = animationOut

        val buttonPrev = findViewById<Button>(R.id.buttonPrev)
        buttonPrev.setOnClickListener { animator.showPrevious() }

        val buttonNext = findViewById<Button>(R.id.buttonNext)
        buttonNext.setOnClickListener { animator.showNext() }
    }
}

We have accessed viewAnimator using kotlin file (i.e. MainActivity.kt file). Then, we have set in and out animations that are applied when current view is replaced by either previous view or next view. Then, we have set click listener on buttons (Prev and Next buttons) that shows previous/next view in viewAnimator respectively.

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.viewanimator"
		  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 ViewAnimator using Kotlin.

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Greetings!
We have recently published 100+ articles on android tutorials with kotlin and java. If you need, you may visit Android Tutorial for beginners page. You can also check Kotlin Tutorial for beginners