How to Create a Custom Intro Slider of an Android App?

Last Updated : 04 May, 2025

Intro Slider in many apps is mostly used to educate the users about the app, the features of the app, and the services that our app will provide to us. In this article, we will take a look at the implementation of Custom Intro Slider in our app.

What we are going to build in this Article?

We will be building a simple application in which we will be displaying an intro slider in which we will show slider in our app. This slider contains a simple image and two TextView. Note that we are going to implement this project using the Java and Kotlin language.

File Structure for the Application

Below is the File Structure of the Application:

Step by Step Implementation

Step 1: Create a New Project

To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio.

Step 2: Adding the dependency for Picasso in your build.gradle file

As we will be loading all our images from online sources so we will be using Glide for loading images from URLs inside our application. So for using the images from the URL we have to add the below dependency in our build.gradle.kts (Module :app) file.

dependencies {     ...     implementation("com.github.bumptech.glide:glide:4.16.0") }

Step 3: Working with the activity_main.xml file

Navigate to the app > res > layout > activity_main.xml and add the below code to that file.

Note: activity_main.xml is the XML file for the main activity window.

activity_main.xml:

activity_main.xml

<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout      xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     tools:context=".MainActivity">      <!--view pager for displaying our slides-->     <androidx.viewpager.widget.ViewPager         android:id="@+id/idViewPager"         android:layout_width="match_parent"         android:layout_height="match_parent"         app:layout_constraintBottom_toBottomOf="parent"         app:layout_constraintEnd_toEndOf="parent"         app:layout_constraintStart_toStartOf="parent"         app:layout_constraintTop_toTopOf="parent" />      <LinearLayout         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:gravity="center"         android:orientation="vertical"         app:layout_constraintBottom_toBottomOf="parent"         app:layout_constraintEnd_toEndOf="parent"         app:layout_constraintStart_toStartOf="parent">          <!--adding linear layout for creating dots view-->         <LinearLayout             android:id="@+id/dotsLayout"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:layout_gravity="center"             android:gravity="center"             android:orientation="horizontal" />          <!--button for skipping our intro slider-->         <Button             android:id="@+id/getStartedButton"             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:layout_margin="32dp"             android:text="Get Started"             android:background="@color/colorPrimary"             android:textColor="@color/white" />      </LinearLayout>  </androidx.constraintlayout.widget.ConstraintLayout>

Step 4: Creating a layout file for our Slider item

Now we will create an item that we will be displaying in our slider. So for creating a new layout navigate to the app > res > layout > Right-click on it > Click on New > layout resource file and name it as slider_layout and add below code to it.

Note: slider_layout.xml is the fragment used for the sliders.

slider_layout.xml:

slider_layout.xml

<?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"     android:gravity="center">      <!--text view for displaying our title-->     <TextView         android:id="@+id/titleTextView"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:padding="10dp"         android:text="Slide 1"         android:textColor="@color/black"         android:textSize="24sp"         android:textStyle="bold" />      <!--Image view for displaying our slider image-->     <ImageView         android:id="@+id/imageView"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:layout_margin="50dp"         android:src="@mipmap/ic_launcher" />      <!--text view for displaying our slider description-->     <TextView         android:id="@+id/descriptionTextView"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Slide Description"         android:textStyle="italic"         android:textColor="@color/black" />  </LinearLayout>

For creating a new Modal class navigate to the app > java > your app’s package name > Right-click on it and click on New > Java/Kotlin class and name it as SliderModal.

SliderModal.java

package org.geeksforgeeks.demo;  public class SliderModal {      private String title;     private String heading;     private int imgUrl;      public SliderModal(String title, String heading, int imgUrl) {         this.title = title;         this.heading = heading;         this.imgUrl = imgUrl;     }      public String getTitle() {         return title;     }      public String getHeading() {         return heading;     }      public int getImgUrl() {         return imgUrl;     } }

SliderModal.kt

package org.geeksforgeeks.demo  data class SliderModal(     val title: String,     val heading: String,     val imgUrl: Int )

Step 6: Create an Adapter class for setting data to each view

For creating a new Adapter class navigate to the app > java > your app’s package name > Right-click on it > New Java/Kotlin class and name it as SliderAdapter and add the below code to it.

SliderAdapter.java

package org.geeksforgeeks.demo;  import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.TextView;  import androidx.viewpager.widget.PagerAdapter;  import com.bumptech.glide.Glide;  import java.util.ArrayList;  public class SliderAdapter extends PagerAdapter {      private Context context;     private ArrayList<SliderModal> sliderModalArrayList;     // LayoutInflater to inflate custom layout     private LayoutInflater layoutInflater;      public SliderAdapter(Context context, ArrayList<SliderModal> sliderModalArrayList) {         this.context = context;         this.sliderModalArrayList = sliderModalArrayList;     }      // Returns the total number of items     @Override     public int getCount() {         return sliderModalArrayList.size();     }      // Checks whether a page View is associated with a specific key object     @Override     public boolean isViewFromObject(View view, Object object) {         return view == object;     }      // Instantiates and returns a page View object     @Override     public Object instantiateItem(ViewGroup container, int position) {         layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);         View view = layoutInflater.inflate(R.layout.slider_layout, container, false);          // Initialize views         ImageView imageView = view.findViewById(R.id.imageView);         TextView titleTV = view.findViewById(R.id.titleTextView);         TextView headingTV = view.findViewById(R.id.descriptionTextView);          // Set data to views         SliderModal modal = sliderModalArrayList.get(position);         titleTV.setText(modal.getTitle());         headingTV.setText(modal.getHeading());         Glide.with(context).load(modal.getImgUrl()).into(imageView);          // Add the view to container         container.addView(view);         return view;     }      // Removes a page View from the container     @Override     public void destroyItem(ViewGroup container, int position, Object object) {         container.removeView((View) object);     } }

SliderAdapter.kt

package org.geeksforgeeks.demo  import android.content.Context import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import android.widget.ImageView import android.widget.TextView import androidx.viewpager.widget.PagerAdapter import com.bumptech.glide.Glide  class SliderAdapter(     private var context: Context,     private var sliderModalArrayList: ArrayList<SliderModal> ) : PagerAdapter() {      // LayoutInflater to inflate custom layout     private lateinit var layoutInflater: LayoutInflater      // Returns the total number of items     override fun getCount(): Int {         return sliderModalArrayList.size     }      // Checks whether a page View is associated with a specific key object     override fun isViewFromObject(view: View, `object`: Any): Boolean {         return view === `object`     }      // Instantiates and returns a page View object     override fun instantiateItem(container: ViewGroup, position: Int): Any {         layoutInflater = context.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater         val view: View = layoutInflater.inflate(R.layout.slider_layout, container, false)          // Initialize views         val imageView = view.findViewById<ImageView>(R.id.imageView)         val titleTV = view.findViewById<TextView>(R.id.titleTextView)         val headingTV = view.findViewById<TextView>(R.id.descriptionTextView)          // Set data to views         val modal: SliderModal = sliderModalArrayList[position]         titleTV.text = modal.title         headingTV.text = modal.heading         Glide.with(context).load(modal.imgUrl).into(imageView)          // Add the view to container         container.addView(view)         return view     }      // Removes a page View from the container     override fun destroyItem(container: ViewGroup, position: Int, `object`: Any) {         container.removeView(`object` as View)     } }

Step 7: Working with theMainActivity file

Go to the MainActivity file and refer to the following code. Below is the code for the MainActivity file. Comments are added inside the code to understand the code in more detail.

MainActivity.java

package org.geeksforgeeks.demo;  import android.os.Bundle; import android.text.Html; import android.widget.LinearLayout; import android.widget.TextView;  import androidx.activity.ComponentActivity; import androidx.activity.enableEdgeToEdge; import androidx.appcompat.app.AppCompatActivity; import androidx.core.content.ContextCompat; import androidx.viewpager.widget.ViewPager; import androidx.viewpager.widget.ViewPager.OnPageChangeListener;  import java.util.ArrayList;  public class MainActivity extends AppCompatActivity {      private ViewPager viewPager;     private LinearLayout dotsLL;     private SliderAdapter adapter;     private ArrayList<SliderModal> sliderModalArrayList;     private TextView[] dots;     private int size = 0;      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         enableEdgeToEdge();         setContentView(R.layout.activity_main);          // Initialize views         viewPager = findViewById(R.id.idViewPager);         dotsLL = findViewById(R.id.dotsLayout);          // Create and populate slider items         sliderModalArrayList = new ArrayList<>();         sliderModalArrayList.add(new SliderModal("Slide 1", "Slide 1 heading", R.drawable.sample1));         sliderModalArrayList.add(new SliderModal("Slide 2", "Slide 2 heading", R.drawable.sample2));         sliderModalArrayList.add(new SliderModal("Slide 3", "Slide 3 heading", R.drawable.sample3));          // Set up adapter with slider items         adapter = new SliderAdapter(this, sliderModalArrayList);         viewPager.setAdapter(adapter);          // Get the total number of slides         size = sliderModalArrayList.size();          // Add initial dot indicators         addDots(size, 0);          // Set page change listener         viewPager.addOnPageChangeListener(viewListener);     }      // Method to add and update dot indicators     private void addDots(int size, int pos) {         dots = new TextView[size];         dotsLL.removeAllViews();          for (int i = 0; i < size; i++) {             dots[i] = new TextView(this);             dots[i].setText(Html.fromHtml("•"));             dots[i].setTextSize(35f);             dots[i].setTextColor(ContextCompat.getColor(this, R.color.black));             dotsLL.addView(dots[i]);         }          // Highlight selected dot         if (dots.length > 0) {             dots[pos].setTextColor(ContextCompat.getColor(this, R.color.colorPrimary));             dots[pos].setTextSize(45f);         }     }      // Page change listener to update dots on slide change     private final OnPageChangeListener viewListener = new OnPageChangeListener() {         @Override         public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}          @Override         public void onPageSelected(int position) {             addDots(size, position);         }          @Override         public void onPageScrollStateChanged(int state) {}     }; }

MainActivity.kt

package org.geeksforgeeks.demo  import android.os.Bundle import android.text.Html import android.widget.LinearLayout import android.widget.TextView import androidx.activity.enableEdgeToEdge import androidx.appcompat.app.AppCompatActivity import androidx.core.content.ContextCompat import androidx.viewpager.widget.ViewPager import androidx.viewpager.widget.ViewPager.OnPageChangeListener  class MainActivity : AppCompatActivity() {      private lateinit var viewPager: ViewPager     private lateinit var dotsLL: LinearLayout     private lateinit var adapter: SliderAdapter     private lateinit var sliderModalArrayList: ArrayList<SliderModal>     private lateinit var dots: Array<TextView?>     private var size: Int = 0      override fun onCreate(savedInstanceState: Bundle?) {         super.onCreate(savedInstanceState)         enableEdgeToEdge()         setContentView(R.layout.activity_main)          // Initialize views         viewPager = findViewById(R.id.idViewPager)         dotsLL = findViewById(R.id.dotsLayout)          // Create and populate slider items         sliderModalArrayList = ArrayList()         sliderModalArrayList.add(SliderModal("Slide 1", "Slide 1 heading", R.drawable.sample1))         sliderModalArrayList.add(SliderModal("Slide 2", "Slide 2 heading", R.drawable.sample2))         sliderModalArrayList.add(SliderModal("Slide 3", "Slide 3 heading", R.drawable.sample3))          // Set up adapter with slider items         adapter = SliderAdapter(this@MainActivity, sliderModalArrayList)         viewPager.adapter = adapter          // Get the total number of slides         size = sliderModalArrayList.size          // Add initial dot indicators         addDots(size, 0)          // Set page change listener         viewPager.addOnPageChangeListener(viewListener)     }      // Method to add and update dot indicators     private fun addDots(size: Int, pos: Int) {         dots = arrayOfNulls(size)         dotsLL.removeAllViews()          for (i in 0 until size) {             dots[i] = TextView(this).apply {                 text = Html.fromHtml("•")                 textSize = 35f                 setTextColor(ContextCompat.getColor(this@MainActivity, R.color.black))             }             dotsLL.addView(dots[i])         }          // Highlight selected dot         if (dots.isNotEmpty()) {             dots[pos]?.apply {                 setTextColor(ContextCompat.getColor(this@MainActivity, R.color.colorPrimary))                 textSize = 45f             }         }     }      // Page change listener to update dots on slide change     private var viewListener: OnPageChangeListener = object : OnPageChangeListener {         override fun onPageScrolled(position: Int, positionOffset: Float, positionOffsetPixels: Int) {}          override fun onPageSelected(position: Int) {             addDots(size, position)         }          override fun onPageScrollStateChanged(state: Int) {}     } }

Note : To access the full Slider in an Android App check this repository: Click Here to Access the Whole Project

Output:

How to Create a Basic Intro Slider of an Android App?

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