Create An Android ViewFlipper Programmatically in Kotlin

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

Output

Tutorialwing Kotlin Dynamic ViewFlipper Output Android ViewFlipper Programmatically in kotlin

Tutorialwing Kotlin Dynamic ViewFlipper Output

Getting Started

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

Step Description
1. Open Android Studio.
2. Go to File => New => New Project. Write application name as DynamicViewFlipper. Then, check Include Kotlin Support and click next button.
3. Select minimum SDK you need. However, we have selected 17 as minimum SDK. Then, click next button
4. Then, select Empty Activity => click next => click finish.
5. At this point, You will get a newly created android project successfully.

Now, we will modify xml and kotlin file to use viewFlipper programmatically in kotlin file in the application.

2. Modify Values Folder

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

<resources>
	<string name="app_name">DynamicViewFlipper</string>
	<string name="pause">Pause</string>
	<string name="play">Play</string>
	<string name="flipping_started">Flipping Started...</string>
	<string name="flipping_stopped">Flipping Stopped...</string>
</resources>

3. Download Drawable Resources Needed

You need some images, stored in res/drawable folder, to be by viewFlipper created dynamically in the application. You can click here to download images used 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/playPause"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_gravity="center_horizontal"
		android:layout_marginTop="15dp"
		android:text="Pause"/>


	<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 linearLayout, with id rootContainer, that will act as container for the viewFlipper created dynamically in the application.

5. Create Android ViewFlipper Programmatically / Dynamically in Kotlin

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

package com.tutorialwing.dynamicviewflipper

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.view.Gravity
import android.view.ViewGroup
import android.widget.*

class MainActivity : AppCompatActivity() {

    private var imageList = intArrayOf(R.drawable.guava, R.drawable.jackfruit, R.drawable.mix_fruit, R.drawable.pomegranate, R.drawable.strawberry, R.drawable.zespri_kiwi)

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

        val viewFlipper = ViewFlipper(this)
        val layoutParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT)
        layoutParams.setMargins(30, 30, 30, 30)
        layoutParams.gravity = Gravity.CENTER
        viewFlipper.layoutParams = layoutParams
        viewFlipper.setFlipInterval(2000)
        viewFlipper.isAutoStart = true

        viewFlipper.setInAnimation(this, android.R.anim.slide_in_left)
        viewFlipper.setOutAnimation(this, android.R.anim.slide_out_right)

        for (image in imageList) {
            val imageView = ImageView(this)
            val params = FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT)
            params.setMargins(30, 30, 30, 30)
            params.gravity = Gravity.CENTER
            imageView.layoutParams = params
            imageView.setImageResource(image)
            viewFlipper.addView(imageView)
        }

        val btnPlayPause = findViewById<Button>(R.id.playPause)
        btnPlayPause?.setOnClickListener {
            if (viewFlipper.isFlipping)
                viewFlipper.stopFlipping()
            else
                viewFlipper.startFlipping()

            btnPlayPause.text = getString(if (viewFlipper.isFlipping) R.string.pause else R.string.play)
            Toast.makeText(this@MainActivity, getString(if (viewFlipper.isFlipping) R.string.flipping_started else R.string.flipping_stopped), Toast.LENGTH_SHORT).show()
        }

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

We have created viewFlipper using kotlin file (i.e. in MainActivity.kt file) in the application. Then, we have set layout params, margins, animations (in and out animations) etc. in it. Then, we have created imageViews dynamically that are equal to length of imageList array in the application. Then, we have added these imageViews into viewFlipper. After that, we have accessed button, having id playPause and set click listener into it. Whenever button is clicked, viewFlipper stops flipping the view if is already flipping the view and vice-versa. We are also showing a toast message that display the current status viewFlipper. At last, we have added viewFlipper 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.dynamicviewflipper"
		  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 ViewFlipper Programmatically in Kotlin.

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Greetings!
We have recently published 100+ articles on android tutorials with kotlin and java. If you need, you may visit Android Tutorial for beginners page. You can also check Kotlin Tutorial for beginners