Create An Android NestedScrollView Programmatically in Kotlin

In this article, we will learn how to create android NestedScrollView programmatically in Kotlin. We will go through various steps that explains how to create NestedScrollView and add it in kotlin file, use different attributes to customise it etc. in any android application. For example, how to set text in NestedScrollView programmatically, how to set id of NestedScrollView, how to capitalise text of NestedScrollView dynamically etc. We will get answer to all such questions in this post.

Learn to use Different Attributes of NestedScrollView in XML File to Customize it.

Output

Tutorialwing Kotlin Dynamic NestedScrollView Output Android NestedScrollView Programmatically in Kotlin

Tutorialwing Kotlin Dynamic NestedScrollView Output

Getting Started

We can define android NestedScrollView widget as below –

NestedScrollView is a widget that are used when we need to implement scrollable view inside another scrollable view.

Now, how do we use NestedScrollView in android application ?

Creating New Project

Follow steps below to create any android project in Kotlin –

Step Description
1. Open Android Studio (Ignore if already done).
2. Go to File => New => New Project. This will open a new window. Then, under Phone and Tablet section, select Empty Activity. Then, click Next.
3. In next screen, select project name as DynamicNestedScrollView. Then, fill other required details.
4. Then, clicking on Finish button creates new project.

Newbie in Android ?
Some very important concepts (Recommended to learn before you move ahead)

Before we move ahead, we need to setup for viewBinding to access NestedScrollView in Kotlin file without using findViewById() method.

Setup ViewBinding

Add viewBinding true in app/build.gradle file.

 
 android { 
 	// OTHER CODE... 
 	buildFeatures { 
 		viewBinding true 
 	} 
 } 
 

Now, set content in activity using view binding.
Open MainActivity.kt file and write below code in it.

 
 class MainActivity : AppCompatActivity() { 
 	
 	private lateinit var binding: ActivityMainBinding 
 	
 	override fun onCreate(savedInstanceState: Bundle?) { 
 		super.onCreate(savedInstanceState) 
 		binding = ActivityMainBinding.inflate(layoutInflater) 
 		val view = binding.root 
 		setContentView(view) 
 	} 
 } 
 

Now, we can access view in Kotlin file without using findViewById() method.

Since we have a new project, we will modify the xml and class file to use NestedScrollView programmatically in kotlin. Please follow the steps below.

Download Drawable Resources Needed

We will need some images, stored in res/drawable folder, to be used in the application. These drawable images will be used by views inside scrollView.

2. Modify Values Folder

Open res/values/strings.xml file. Add below code into it.

<resources>
    <string name="app_name">DynamicNestedScrollView</string>

    <string name="no_image">No Image</string>
    <string name="nested_scroll_text">Tutorialwing.com presents tutorial on NestedScrollView!
        NestedScrollView is just like ScrollView, but it supports acting as both a nested
        scrolling parent and child on both new and old versions of Android. Nested scrolling
        is enabled by default. NestedScrollView is used when there is need for scrolling inside
        another scrolling view. Normally this would be difficult task because system would be
        unable to decide which view to scroll. This is where NestedScrollView comes into role.
    </string>

</resources>

Other values folders have not been changed. So, we are not going to mention it here.

3. Modify Layout Folder

Open res/layout/activity_main.xml file. Add below code into it.

<?xml version="1.0" encoding="utf-8"?>
<ScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="20dp"
        android:gravity="center"
        android:orientation="vertical">

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

        </LinearLayout>

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="20dp"
            android:contentDescription="@string/no_image"
            android:src="@drawable/guava"/>

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="20dp"
            android:contentDescription="@string/no_image"
            android:src="@drawable/jackfruit"/>

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="20dp"
            android:contentDescription="@string/no_image"
            android:src="@drawable/mix_fruit"/>

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="20dp"
            android:contentDescription="@string/no_image"
            android:src="@drawable/pomegranate"/>

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="20dp"
            android:contentDescription="@string/no_image"
            android:src="@drawable/strawberry"/>

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="20dp"
            android:contentDescription="@string/no_image"
            android:src="@drawable/zespri_kiwi"/>

    </LinearLayout>

</ScrollView>

In activity_main.xml file, we have completed below things –
a. We have defined scrollView and a linearLayout with id rootContainer that will act as container for the nestedScrollView created programmatically in the application.
b. All the imageViews have been defined inside linearLayout, a direct child of scrollView.

4. Create Android NestedScrollView programmatically in Kotlin

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

package com.tutorialwing.dynamicnestedscrollview

import android.graphics.Color
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.ViewGroup
import android.widget.LinearLayout
import android.widget.TextView
import androidx.core.widget.NestedScrollView
import com.tutorialwing.dynamicnestedscrollview.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity() {

	private lateinit var binding: ActivityMainBinding

	override fun onCreate(savedInstanceState: Bundle?) {
		super.onCreate(savedInstanceState)
		binding = ActivityMainBinding.inflate(layoutInflater)
		val view = binding.root
		setContentView(view)

		setupNestedScrollView()
	}

	private fun setupNestedScrollView() {
		// Create NestedScrollView Dynamically
		val nestedScrollView = NestedScrollView(this)
		val layoutParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 200)
		layoutParams.setMargins(30, 30, 30, 30)
		nestedScrollView.layoutParams = layoutParams
		nestedScrollView.setBackgroundColor(Color.WHITE)

		// Add NestedScrollView to linearLayout having id rootContainer
		binding.rootContainer.addView(nestedScrollView)

		// Created LinearLayout and add it to NestedScrollView
		val linearLayout = LinearLayout(this)
		val linearParams = LinearLayout.LayoutParams(
			ViewGroup.LayoutParams.MATCH_PARENT,
			ViewGroup.LayoutParams.WRAP_CONTENT
		)
		linearLayout.orientation = LinearLayout.VERTICAL
		linearLayout.layoutParams = linearParams

		nestedScrollView.addView(linearLayout)

		// Created TextView and add it to linearLayout
		val textView = TextView(this)
		val textParams = LinearLayout.LayoutParams(
			ViewGroup.LayoutParams.WRAP_CONTENT,
			ViewGroup.LayoutParams.WRAP_CONTENT
		)
		textView.layoutParams = textParams
		textView.text = getString(R.string.nested_scroll_text)
		textView.setPadding(15, 15, 15, 15)

		linearLayout.addView(textView)
	}
}

We have defined nestedScrollView programmatically in kotlin file (i.e. in MainActivity.kt file). Then, we have set layout params, margins etc. in it. Then, we have added it in linearLayout having id rootContainer. After that, we have created linearLayout as a direct child of nestedScrollView. Then, we have created textView and added in linearLayout.

Finally, when you run the application, you will get output as shown above.

Tutorialwing Kotlin Dynamic NestedScrollView Output Android NestedScrollView Programmatically in Kotlin

Tutorialwing Kotlin Dynamic NestedScrollView Output

Now, Let’s check how to use different attributes of NestedScrollView to customize it dynamically –

Set Id of NestedScrollView

Follow steps below to set id of NestedScrollView programmatically –

  • Create ids.xml file in res/values folder. Then, add below code into it –
    <?xml version="1.0" encoding="utf-8"?>
    <resources>
        <item type="id" name="nestedScrollView_ID" />
    </resources>
    
  • Now, we can set id of NestedScrollView dynamically, in MainActivity.kt file, as –

    nestedScrollView.id = R.id.nestedScrollView_ID  // NestedScrollView
    

    Here, we have set id of NestedScrollView using property access syntax – nestedScrollView.id

Learn to Set ID of NestedScrollView Using XML Attribute

Set Width and Height of NestedScrollView

We use layoutParams to set width and height of any View programmatically. In this article, we have added NestedScrollView in LinearLayout. So, we will define LayoutParams as below –

nestedScrollView.layoutParams = LinearLayout.LayoutParams(
	ViewGroup.LayoutParams.WRAP_CONTENT,
	ViewGroup.LayoutParams.WRAP_CONTENT
)

Here, we have set width and height as WRAP_CONTENT. Some of possible values for width and height are –

  • WRAP_CONTENT: Sets value of width or height depending on text inside it.
  • MATCH_PARENT: Sets value of width of height depending on width or height of parent layout . i.e. width or height of NestedScrollView will be same as width or height of parent layout.
  • Fixed Value: Sets width or height as per value provided.

Learn to Set Width or Height of NestedScrollView Using XML Attribute

Set Padding of NestedScrollView

Follow steps below to set padding of NestedScrollView Dynamically –

  • If there is no dimens.xml file, create dimens.xml file in res/values folder. Then, add below code in it –
    <?xml version="1.0" encoding="utf-8"?>
    <resources>
        <dimen name="text_padding">16dp</dimen>
    </resources>
    
  • Now, we can set padding of NestedScrollView dynamically, in MainActivity.kt file, as –
    val padding = resources.getDimension(R.dimen.text_padding).toInt()
    nestedScrollView.setPadding(padding, padding, padding, padding)
    

    Here, we have accessed dimension defined in dimens.xml using getDimension() method. Then, set padding of NestedScrollView using setPadding() method.

Learn to Set Padding of NestedScrollView Using XML Attribute

Set Margin of NestedScrollView

Follow steps below to set margin of NestedScrollView Dynamically –

  • If there is no dimens.xml file, create dimens.xml file in res/values folder. Then, add below code in it –
    <?xml version="1.0" encoding="utf-8"?>
    <resources>
        <dimen name="text_margin">16dp</dimen>
    </resources>
    
  • Now, we can set margin of NestedScrollView dynamically, in MainActivity.kt file, as –
    val margin = resources.getDimension(R.dimen.text_margin).toInt()
    val layoutParams = LinearLayout.LayoutParams(
    	ViewGroup.LayoutParams.WRAP_CONTENT,
    	ViewGroup.LayoutParams.WRAP_CONTENT
    )
    layoutParams.setMargins(margin, margin, margin, margin)
    nestedScrollView.layoutParams = layoutParams
    

    Here, we have accessed dimension defined in dimens.xml using getDimension() method. Then, we have defined layoutParams, set margin to layoutParams. After that, set layoutParams to NestedScrollView.

Learn to Set Margin of NestedScrollView Using XML Attribute

Set Background of NestedScrollView

Follow steps below to set background of NestedScrollView programmatically –

  • If there is no colors.xml file, create colors.xml file in res/values folder. Then, add below code in it –
    <?xml version="1.0" encoding="utf-8"?>
    <resources>
        <color name="purple_200">#FFBB86FC</color>
    </resources>
    
  • Now, we can set background of NestedScrollView dynamically, in MainActivity.kt file, as –
    val color = ContextCompat.getColor(this, R.color.purple_200)
    nestedScrollView.setBackgroundColor(color)
    

    Here, we used setBackgroundColor() method to set background color in nestedScrollView.

Learn to Set Background of NestedScrollView Using XML Attribute

Set Visibility of NestedScrollView

We can set visibility of NestedScrollView programmatically as –

nestedScrollView.visibility = View.VISIBLE

Here, we have set visibility of NestedScrollView using nestedScrollView.visibility attribute. Visibility can be of three types – gone, visible and invisible.
Learn to Set Visibility of NestedScrollView Using XML Attribute

That’s end of tutorial on NestedScrollView Programmatically in Kotlin With Example.

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