Create Different Types of Circle in Canvas in Android using Jetpack Compose

Last Updated : 20 Apr, 2022

In Android, Canvas is used for creating different types of visual elements, which is most commonly used for creating different types of shapes. In our example, we have created a circle of different types, i.e., the circle with a solid boundary with no fill, the circle with a dotted boundary with no fill, the circle with no boundary and solid fill, and a circle, with a boundary and a solid fill as shown below.

In this article, we will show you how you could create different types of Circle in Canvas 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.geeksforgeeks.jcdrawcircle

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.Canvas
import androidx.compose.foundation.layout.*
import androidx.compose.material.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.PathEffect
import androidx.compose.ui.graphics.drawscope.Stroke
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 | Draw Circle", color = Color.White) }, backgroundColor = Color(0xff0f9d58)) },

                // Creating Content
                content = {

                    // Creating a Column Layout
                    Column(Modifier.fillMaxSize(), horizontalAlignment = Alignment.CenterHorizontally, verticalArrangement = Arrangement.Center) {

                        // 1. OUTLINED CIRCLE
                        Row(Modifier.fillMaxWidth().height(100.dp)) {
                            // Creating a Canvas to draw a Circle
                            Canvas(modifier = Modifier.fillMaxSize()) {
                                val canvasWidth = size.width
                                val canvasHeight = size.height

                                drawCircle(
                                    color = Color(0xff0f9d58),
                                    center = Offset(x = canvasWidth / 2, y = canvasHeight / 2),
                                    radius = size.minDimension/2,
                                    style = Stroke(10F)
                                )
                            }
                        }

                        // Adding a Space of height 100dp
                        Spacer(modifier = Modifier.height(50.dp))

                        // 2. DASH_PATH_EFFECT CIRCLE
                        Row(Modifier.fillMaxWidth().height(100.dp)) {
                            // Creating a Canvas to draw a Circle
                            Canvas(modifier = Modifier.fillMaxSize()) {
                                val canvasWidth = size.width
                                val canvasHeight = size.height

                                drawCircle(
                                    color = Color(0xff0f9d58),
                                    center = Offset(x = canvasWidth / 2, y = canvasHeight / 2),
                                    radius = size.minDimension/2,
                                    style = Stroke(width = 8f, pathEffect = PathEffect.dashPathEffect(floatArrayOf(10f, 10f), 0f))
                                )
                            }
                        }

                        // Adding a Space of height 100dp
                        Spacer(modifier = Modifier.height(50.dp))

                        // 3. FILLED CIRCLE
                        Row(Modifier.fillMaxWidth().height(100.dp)) {
                            // Creating a Canvas to draw a Circle
                            Canvas(modifier = Modifier.fillMaxSize()) {
                                val canvasWidth = size.width
                                val canvasHeight = size.height

                                drawCircle(
                                    color = Color(0xff0f9d58),
                                    center = Offset(x = canvasWidth / 2, y = canvasHeight / 2),
                                    radius = size.minDimension/2
                                )

                            }
                        }

                        // Adding a Space of height 100dp
                        Spacer(modifier = Modifier.height(50.dp))

                        // 4. OUTLINED (Color1) - FILLED (Color2) CIRCLE
                        Row(Modifier.fillMaxWidth().height(100.dp)) {
                            // Creating a Canvas to draw a Circle
                            Canvas(modifier = Modifier.fillMaxSize()) {
                                val canvasWidth = size.width
                                val canvasHeight = size.height

                                drawCircle(
                                    color = Color.Black,
                                    center = Offset(x = canvasWidth / 2, y = canvasHeight / 2),
                                    radius = size.minDimension/1.9F
                                )

                                drawCircle(
                                    color = Color(0xff0f9d58),
                                    center = Offset(x = canvasWidth / 2, y = canvasHeight / 2),
                                    radius = size.minDimension/2
                                )
                            }
                        }
                    }
                }
            )
        }
    }
}