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

Output

Tutorialwing Kotlin Dynamic TextSwitcher Output

Getting Started

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

2. Modify Values Folder

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

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

3. 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/button"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_gravity="center"
		android:layout_marginTop="40dp"
		android:text="@string/next"/>

	<LinearLayout
		android:id="@+id/rootContainer"
		android:layout_width="match_parent"
		android:layout_height="wrap_content"
		android:layout_marginTop="20dp"
		android:orientation="vertical">

	</LinearLayout>

</LinearLayout>

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

4. Create Android TextSwitcher Programmatically / Dynamically in Kotlin

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

package com.tutorialwing.dynamictextswitcher

import android.graphics.Color
import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.view.Gravity
import android.view.animation.AnimationUtils
import android.widget.Button
import android.widget.LinearLayout
import android.widget.TextSwitcher
import android.widget.TextView

class MainActivity : AppCompatActivity() {

    private val textList = arrayOf("Panda", "Tiger", "Zebra", "Lion", "Deer", "Goat", "Ape", "Monkey", "Human")
    private var index = 0

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

        val textSwitcher = TextSwitcher(this)
        textSwitcher.setFactory {
            val textView = TextView(this@MainActivity)
            textView.gravity = Gravity.TOP or Gravity.CENTER_HORIZONTAL
            textView.textSize = 32f
            textView.setTextColor(Color.RED)
            textView
        }
        textSwitcher.setText(textList[index])

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

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

        val button = findViewById<Button>(R.id.button)
        button.setOnClickListener {
            index = if (index + 1 < textList.size) index + 1 else 0
            textSwitcher.setText(textList[index])
        }

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

We have created textSwitcher programmatically in kotlin file (i.e. in MainActivity.kt file) in the application. Then, we have set factory that defines views between which textSwitcher switches. After that, we have set in and out animations that are used when current text is animated out and next text is animated in. Then, we have set click listener to show next text whenever it is clicked. At last, we have added this textSwitcher in linearLayout programmatically.

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.dynamictextswitcher"
		  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 TextSwitcher Programmatically in Kotlin.