Implement Vertical and Horizontal Draggable Modifier in Android using Jetpack Compose
In Jetpack Compose, a Draggable modifier is a modifier similar to scrollable, which is the high-level entry point to drag gestures in a single orientation and report the drag distance in pixels. Draggable modifier can be implemented on top of any element. Users can hold the element state and drag it vertically and horizontally.
In this article, we will show you how you could implement a Draggable Modifier 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.jcdraggablemodifier import android.os.Bundle import androidx.activity.ComponentActivity import androidx.activity.compose.setContent import androidx.compose.foundation.gestures.Orientation import androidx.compose.foundation.gestures.draggable import androidx.compose.foundation.gestures.rememberDraggableState import androidx.compose.foundation.layout.* 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.unit.IntOffset import androidx.compose.ui.unit.dp import androidx.compose.ui.unit.sp import kotlin.math.roundToInt 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 | Draggable Modifier" , color = Color.White) }, backgroundColor = Color( 0xff0f9d58 )) }, // Creating Content content = { // Creating a Column Layout Column(Modifier.fillMaxSize(), horizontalAlignment = Alignment.CenterHorizontally, verticalArrangement = Arrangement.Center) { // Horizontally Draggable Modifier var offsetX by remember { mutableStateOf(0f) } Text( modifier = Modifier .offset { IntOffset(offsetX.roundToInt(), 0 ) } .draggable( orientation = Orientation.Horizontal, state = rememberDraggableState { delta -> offsetX += delta } ), text = "I move Horizontally!" , fontSize = 20 .sp ) // Adding a Space of 100dp height Spacer(modifier = Modifier.height( 100 .dp)) // Vertically Draggable Modifier var offsetY by remember { mutableStateOf(0f) } Text( modifier = Modifier .offset { IntOffset( 0 , offsetY.roundToInt()) } .draggable( orientation = Orientation.Vertical, state = rememberDraggableState { delta -> offsetY += delta } ), text = "I move Vertically!" , fontSize = 20 .sp ) } } ) } } } |
Output:
In the below-recorded video, you can see that we are successfully able to drag elements vertically and horizontally.