Hello Readers! In this post, we are going to learn how to create an android progressBar programmatically in kotlin. We will also learn how to add progressBar into linearLayout programmatically in any android application.

Output

Tutorialwing Android Dynamic ProgressBar Output

Getting Started

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

2. Modify Values Folder

No values folders have been modified. So, we are not going to mention them here.

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:gravity="center"
	android:orientation="vertical">

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

	</LinearLayout>

	<Button
		android:id="@+id/button"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:text="HIDE PROGRESSBAR"/>

</LinearLayout>

In activity_main.xml file, we have defined a linearLayout, with id rootContainer, that will act as container for the progressBar created dynamically in the application. We have also defined a button that will cause the progressBar to show/hide whenever it is clicked.

4. Create Android ProgressBar Programmatically / Dynamically in Kotlin

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

package com.tutorialwing.dynamicprogressbar

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.view.View
import android.view.ViewGroup
import android.widget.Button
import android.widget.LinearLayout
import android.widget.ProgressBar

class MainActivity : AppCompatActivity() {

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

        // Create progressBar dynamically...
        val progressBar = ProgressBar(this)
        progressBar.layoutParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)

        val linearLayout = findViewById<LinearLayout>(R.id.rootContainer)
        // Add ProgressBar to LinearLayout
        linearLayout?.addView(progressBar)

        val btn = findViewById<Button>(R.id.button)
        btn?.setOnClickListener {
            val visibility = if (progressBar.visibility == View.GONE) View.VISIBLE else View.GONE
            progressBar.visibility = visibility

            val btnText = if (progressBar.visibility == View.GONE) "SHOW PROGRESSBAR" else "HIDE PROGRESSBAR"
            btn.text = btnText
        }
    }
}

Here, we have created a progressBar programmatically in kotlin file (in MainActivity.kt file). After that, we have added this widget into linearLayout. Then, we have set a click listener to show/hide progressBar added in linearLayout.

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.dynamicprogressbar"
		  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 ProgressBar Programmatically in Kotlin.