How to use ViewFlipper Android using Kotlin?

This example demonstrates how to use ViewFlipper Android using Kotlin.

Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity">    <ViewFlipper       android:id="@+id/viewFlipper"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_above="@+id/button"       android:inAnimation="@android:anim/slide_in_left"       android:outAnimation="@android:anim/slide_out_right">    <ImageView       android:layout_width="match_parent"       android:layout_height="match_parent"       android:layout_gravity="center"       android:src="@drawable/image" />    <Button       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_gravity="center"       android:text="Button"       android:textColor="@android:color/holo_blue_bright"       android:textSize="48sp"       android:textStyle="bold" />    </ViewFlipper>    <Button       android:id="@+id/button"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_alignParentStart="true"       android:layout_alignParentBottom="true"       android:layout_margin="8dp"       android:onClick="previousView"       android:text="Previous" />    <Button       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_alignParentEnd="true"       android:layout_alignParentBottom="true"       android:layout_margin="8dp"       android:onClick="nextView"       android:text="Next" /> </RelativeLayout>

Step 3 − Add the following code to src/MainActivity.kt

import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.view.Gravity import android.view.View import android.widget.TextView import android.widget.ViewFlipper class MainActivity : AppCompatActivity() {    lateinit var viewFlipper: ViewFlipper    override fun onCreate(savedInstanceState: Bundle?) {       super.onCreate(savedInstanceState)       setContentView(R.layout.activity_main)       title = "KotlinApp"       viewFlipper = findViewById(R.id.viewFlipper)       val textView = TextView(this)       textView.text = "Have a great day"       textView.textSize = 24F       textView.textColors.defaultColor       textView.gravity = Gravity.CENTER       viewFlipper.addView(textView)       viewFlipper.flipInterval = 2000       viewFlipper.startFlipping()    }    fun previousView(view: View) {       viewFlipper.setInAnimation(this, R.anim.slide_in_left)       viewFlipper.setOutAnimation(this, R.anim.slide_out_right)       viewFlipper.showPrevious();    }    fun nextView(view: View) {       viewFlipper.setInAnimation(this, android.R.anim.slide_in_left)       viewFlipper.setOutAnimation(this,       android.R.anim.slide_out_right)       viewFlipper.showNext()    } }

Step 4 − Create a android Resource Directory(anim) → Right click, create android Resource files (slide_out_right & slide_in_left) and the following codes −

slide_out_right.xml

<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android">    <translate       android:duration="@android:integer/config_mediumAnimTime"       android:fromXDelta="50%p"       android:toXDelta="0" />    <alpha       android:duration="@android:integer/config_mediumAnimTime"       android:fromAlpha="0.0"       android:toAlpha="1.0" /> </set>

slide_in_left.xml

<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android">    <translate       android:duration="@android:integer/config_mediumAnimTime"       android:fromXDelta="0"       android:toXDelta="-50%p" />    <alpha       android:duration="@android:integer/config_mediumAnimTime"       android:fromAlpha="1.0"       android:toAlpha="0.0" /> </set>

Step 5 − Add the following code to androidManifest.xml

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.q11">    <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>

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click the Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen