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

Output

Tutorialwing Kotlin Dynamic ViewSwitcher Output

Getting Started

At first, we will create android project. Then, we will create and use viewSwitcher 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 viewSwitcher dynamically.

2. Modify Values Folder

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

<resources>
	<string name="app_name">DynamicViewSwitcher</string>
	<string name="next">Next</string>
</resources>

3. Download Drawable Resources Needed

You may need images, stored in res/drawable folder, that will be used in the application. These drawable images will be used by viewSwitcher while creating different views in the application.

4. 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">

	<Button
		android:id="@+id/btnNext"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_gravity="center"
		android:layout_margin="20dp"
		android:text="@string/next"/>

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

	</LinearLayout>

</LinearLayout>

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

5. Create Android ViewSwitcher Programmatically / Dynamically in Kotlin

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

package com.tutorialwing.dynamicviewswitcher

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.view.ViewGroup
import android.view.animation.AnimationUtils
import android.widget.Button
import android.widget.ImageView
import android.widget.LinearLayout
import android.widget.ViewSwitcher

class MainActivity : AppCompatActivity() {

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

        val viewSwitcher = ViewSwitcher(this)
        val layoutParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)
        viewSwitcher.layoutParams = layoutParams

        val `in` = AnimationUtils.loadAnimation(this, android.R.anim.slide_in_left)
        viewSwitcher.inAnimation = `in`

        val out = AnimationUtils.loadAnimation(this, android.R.anim.slide_out_right)
        viewSwitcher.outAnimation = out

        val imageView1 = ImageView(this)
        val params1 = LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)
        imageView1.layoutParams = params1
        imageView1.setImageResource(R.drawable.pomegranate)

        val imageView2 = ImageView(this)
        val params2 = LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)
        imageView2.layoutParams = params2
        imageView2.setImageResource(R.drawable.zespri_kiwi)

        viewSwitcher.addView(imageView1)
        viewSwitcher.addView(imageView2)

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

        val btnNext = findViewById<Button>(R.id.btnNext)
        btnNext?.setOnClickListener { viewSwitcher.showNext() }
    }
}

In MainActivity.kt file, we have done below things –
a. We have created viewSwitcher dynamically. Then, we have set layout params in it. Then, we have set in and out animations in it.
b. After that, we have created two imageViews that will be added a child views to viewSwitcher widget.
c. Then, we have added this viewSwitcher into linearLayout having id rootContainer.

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.dynamicviewswitcher"
		  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 ViewSwitcher Programmatically in Kotlin.