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

Output

Tutorialwing Kotlin ViewSwitcher Output

Getting Started

Android ViewSwitcher can be defined as below –

Android ViewSwitcher is a viewAnimator that are used to switch between two views. You may use viewFactory to create views or add your custom view to create views.

Different Attributes of Android ViewSwitcher Widget

Some of the popular attributes of android viewSwitcher widget inherited from viewAnimator are –

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

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

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

Example of Android ViewSwitcher Using Kotlin

At first, we will create android application. Then, we will use ViewSwitcher 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.

Since we have a project now, we will modify xml and other files to use viewSwitcher 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">ViewSwitcher</string>
	<string name="next">Next</string>
	<string name="no_image">No Image</string>
</resources>

3. Download Drawable Resources Needed

You may need images, stored in res/drawable folder, that are needed in the application. These drawable images will be used by viewSwitcher in the application.

4. Use ViewSwitcher 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">

	<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"/>

	<ViewSwitcher
		android:id="@+id/viewFlipper"
		android:layout_width="match_parent"
		android:layout_height="wrap_content">

		<ImageView
			android:id="@+id/image1"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:layout_gravity="center"
			android:contentDescription="@string/no_image"
			android:src="@drawable/pomegranate"/>

		<ImageView
			android:id="@+id/image2"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:layout_gravity="center"
			android:contentDescription="@string/no_image"
			android:src="@drawable/zespri_kiwi"/>

	</ViewSwitcher>

</LinearLayout>

In activity_main.xml file, we have defined ViewSwitcher widget. Note that there are only two views (i.e. imageView) of viewSwitcher. However, only one view is shown at a time.

5. Access ViewSwitcher Widget in Kotlin file

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

package com.tutorialwing.viewswitcher

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

class MainActivity : AppCompatActivity() {

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

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

In MainActivity.java file, we have accessed viewSwitcher widget. Then, we have set in and out animations in it. At last, we have set a click listener to show next view in the viewSwitcher whenever button is clicked.

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.viewswitcher"
		  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 viewSwitcher using Kotlin.