Hello Readers! In this post, we are going to learn about how to use android viewAnimator programmatically in kotlin in the application. We will also learn how to add viewAnimator to linearLayout programmatically in android application.

Output

Tutorialwing Kotlin Dynamic ViewAnimator Output

Getting Started

At first, we will create android project. Then, we will create and use viewAnimator programmatically in kotlin file.

1. Creating New Project in Kotlin

Follow the steps below to create new project. Please ignore the steps if you have already created a new project.

Now, we will modify xml and kotlin file to use viewAnimator dynamically.

2. Modify Values Folder

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

<resources>
	<string name="app_name">DynamicViewAnimator</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. Modify Layout Folder

Open res/layout/activity_main.xml file. Then, 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>

	<LinearLayout
		android:id="@+id/rootContainer"
		android:layout_width="match_parent"
		android:layout_height="wrap_content"
		android:orientation="horizontal">

	</LinearLayout>

</LinearLayout>

In activity_main.xml file, we have defined buttons a linearLayout, with id rootContainer, that will act as container for the viewAnimator created programmatically in the application.

4. Create Android ViewAnimator Programmatically / Dynamically in Kotlin

Open app/src/main/java/com.tutorialwing.dynamicviewanimator/MainActivity.kt file. Then, add below code into it.

package com.tutorialwing.dynamicviewanimator

import android.graphics.Color
import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.view.ViewGroup
import android.view.animation.AnimationUtils
import android.widget.*

class MainActivity : AppCompatActivity() {

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

        val viewAnimator = ViewAnimator(this)
        val layoutParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)
        layoutParams.setMargins(30, 30, 30, 30)
        viewAnimator.layoutParams = layoutParams

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

        viewAnimator.inAnimation = animationIn
        viewAnimator.outAnimation = animationOut

        val textView = TextView(this)
        val textParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)
        textView.layoutParams = textParams
        textView.text = getString(R.string.item_post_1)
        textView.setTextColor(Color.RED)
        viewAnimator.addView(textView)

        val button = Button(this)
        val buttonParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)
        button.layoutParams = buttonParams
        button.text = getString(R.string.item_post_2)
        button.setTextColor(Color.RED)
        viewAnimator.addView(button)

        val imageView = ImageView(this)
        val imageParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)
        imageView.layoutParams = imageParams
        imageView.setImageResource(R.mipmap.ic_launcher)
        viewAnimator.addView(imageView)

        val textView2 = TextView(this)
        val textParams2 = LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)
        textView2.layoutParams = textParams2
        textView2.text = getString(R.string.item_post_4)
        textView2.setTextColor(Color.RED)
        viewAnimator.addView(textView2)

        val linearLayout = findViewById<LinearLayout>(R.id.rootContainer)
        linearLayout.addView(viewAnimator)

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

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

We have created viewAnimator programmatically in kotlin file( i.e. in MainActivity.kt file) in the application. Then, we have set layout params, margins etc. in it. Then, we have created child views for viewAnimator. They are TextView, Button, ImageView and TextView respectively. Each one of them have been added to viewAnimator. Then, we have added this viewAnimator in linearLayout having id rootContainer. Then, we have added click listener on prev and next buttons to show previous and 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 src/main/AndroidManifest.xml file is –

<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.tutorialwing.dynamicviewanimator"
		  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 Creating Android ViewAnimator Programmatically in Kotlin.