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

Azhar

Updated on: 05-Nov-2020

294 Views

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