Expandable Text in Android using Jetpack Compose
Many applications display tons of textual data in form of passages and have the feature of expanding or contracting it. Generally, 2-3 out of n lines of a passage are displayed along with “View More”, “Read More”, and “…” at the end. These appear like hyperlinks that upon click expand the text to full.
So in this article, we will show you how you could create an expandable text in Android using Jetpack Compose. Follow the below steps once the IDE is ready.
Step by Step Implementation
Step 1: Create a New Project in Android Studio
To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. While choosing the template, select Empty Compose Activity. If you do not find this template, try upgrading the Android Studio to the latest version. We demonstrated the application in Kotlin, so make sure you select Kotlin as the primary language while creating a New Project.
Step 2: Working with the MainActivity.kt file
Go to the MainActivity.kt file and refer to the following code. Below is the code for the MainActivity.kt file. Comments are added inside the code to understand the code in more detail.
Kotlin
package com.w3wiki.expandabletext import android.os.Bundle import androidx.activity.ComponentActivity import androidx.activity.compose.setContent import androidx.compose.animation.animateContentSize import androidx.compose.animation.core.tween import androidx.compose.foundation.clickable import androidx.compose.foundation.interaction.MutableInteractionSource import androidx.compose.foundation.layout.Arrangement import androidx.compose.foundation.layout.Column import androidx.compose.foundation.layout.fillMaxSize import androidx.compose.foundation.layout.padding import androidx.compose.material.* import androidx.compose.runtime.getValue import androidx.compose.runtime.mutableStateOf import androidx.compose.runtime.remember import androidx.compose.runtime.setValue import androidx.compose.ui.Alignment import androidx.compose.ui.Modifier import androidx.compose.ui.graphics.Color import androidx.compose.ui.text.style.TextOverflow import androidx.compose.ui.unit.dp class MainActivity : ComponentActivity() { override fun onCreate(savedInstanceState: Bundle?) { super .onCreate(savedInstanceState) setContent { // Creating a Simple Scaffold // Layout for the application Scaffold( // Creating a Top Bar topBar = { TopAppBar(title = { Text( "GFG | Expandable Text" , color = Color.White) }, backgroundColor = Color( 0xff0f9d58 )) }, // Creating Content content = { // Creating a Column Layout Column(Modifier.fillMaxSize(), horizontalAlignment = Alignment.CenterHorizontally, verticalArrangement = Arrangement.Center) { // Creating a boolean value for // storing expanded state var showMore by remember { mutableStateOf( false ) } // Creating a long text val text = "A computer science portal for Beginner. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions." Column(modifier = Modifier.padding( 20 .dp)) { // Creating a clickable modifier // that consists text Column(modifier = Modifier .animateContentSize(animationSpec = tween( 100 )) .clickable( interactionSource = remember { MutableInteractionSource() }, indication = null ) { showMore = !showMore }) { // if showMore is true, the Text will expand // Else Text will be restricted to 3 Lines of display if (showMore) { Text(text = text) } else { Text(text = text, maxLines = 3 , overflow = TextOverflow.Ellipsis) } } } } } ) } } } |
Output:
You can see that we are successfully able to implement expandable text in our application.
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