Floating Action Button in Android using Jetpack Compose

Floating Action Button is added to the android application to perform some important within the android application. These are implemented in the android application UI for some primary actions within the application. There are different types of floating action buttons such as simple, square, and extended floating action buttons. In this article, we will take a look at How to implement all different types of floating action buttons in android using Jetpack Compose. A sample video is given below to get an idea about what we are going to do in this article.

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 Color.kt file

Navigate to app>java>your app’s package name>ui.theme>Color.kt file and add the below code to it. Comments are added in the code to get to know in detail. 

Kotlin

package com.example.newcanaryproject.ui.theme

import androidx.compose.ui.graphics.Color

val Purple200 = Color(0xFF0F9D58)
val Purple500 = Color(0xFF0F9D58)
val Purple700 = Color(0xFF3700B3)
val Teal200 = Color(0xFF03DAC5)

// on below line we are adding different colors.
val greenColor = Color(0xFF0F9D58)

Step 3: 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.example.newcanaryproject

import android.app.Activity
import android.content.Context
import android.os.Bundle
import android.widget.Chronometer
import android.widget.Toast
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.*
import androidx.compose.material.*
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.Add
import androidx.compose.runtime.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.*
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.text.font.FontFamily
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.input.TextFieldValue
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.*
import com.example.newcanaryproject.ui.theme.*
import dev.shreyaspatil.easyupipayment.EasyUpiPayment
import dev.shreyaspatil.easyupipayment.listener.PaymentStatusListener
import dev.shreyaspatil.easyupipayment.model.PaymentApp
import dev.shreyaspatil.easyupipayment.model.TransactionDetails
import java.text.SimpleDateFormat
import java.util.*

class MainActivity : ComponentActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            NewCanaryProjectTheme {
                // on below line we are specifying background color for our application
                Surface(
                    // on below line we are specifying modifier and color for our app
                    modifier = Modifier.fillMaxSize(), color = MaterialTheme.colors.background
                ) {

                    // on the below line we are specifying the theme as the scaffold.
                    Scaffold(

                        // in scaffold we are specifying the top bar.
                        topBar = {

                            // inside top bar we are specifying background color.
                            TopAppBar(backgroundColor = greenColor,

                                // along with that we are specifying title for our top bar.
                                title = {

                                    // in the top bar we are specifying tile as a text
                                    Text(

                                        // on below line we are specifying
                                        // text to display in top app bar.
                                        text = "Floating Action Buttons in Android",

                                        // on below line we are specifying
                                        // modifier to fill max width.
                                        modifier = Modifier.fillMaxWidth(),

                                        // on below line we are specifying
                                        // text alignment.
                                        textAlign = TextAlign.Center,

                                        // on below line we are specifying
                                        // color for our text.
                                        color = Color.White
                                    )
                                })
                        }) {
                        // on below line we are
                        // calling floating action buttons
                        // to display our fabs.
                        floatingActionButtons()
                    }
                }
            }
        }
    }
}

@Composable
fun floatingActionButtons() {

    val ctx = LocalContext.current

    // on the below line we are creating a column.
    Column(
        // on below line we are adding a modifier to it
        // and setting max size, max height and max width
        modifier = Modifier
            .fillMaxSize()
            .fillMaxHeight()
            .fillMaxWidth(),

        // on below line we are adding vertical
        // arrangement and horizontal alignment.
        verticalArrangement = Arrangement.Center,
        horizontalAlignment = Alignment.CenterHorizontally
    ) {

        // on below line we are creating a text
        Text(
            // on below line we are specifying text as
            // Session Management in Android.
            text = "Floating Action Buttons in Android\nJetpack Compose",

            // on below line we are specifying text color.
            color = greenColor,

            // on below line we are specifying font family
            fontFamily = FontFamily.Default,

            // on below line we are adding font weight
            // and alignment for our text
            fontWeight = FontWeight.Bold, textAlign = TextAlign.Center
        )
        // on below line adding a spacer
        Spacer(modifier = Modifier.height(20.dp))

        // on below line we are creating
        // a simple floating action button
        FloatingActionButton(
            // on below line we are adding on click for our fab
            onClick = {
                Toast.makeText(ctx, "Simple Floating Action Button", Toast.LENGTH_SHORT).show()
            },
            // on below line we are adding
            // background color for our button
            backgroundColor = greenColor,
            // on below line we are adding
            // color for our content of fab.
            contentColor = Color.White
        ) {
            // on below line we are
            // adding icon for button.
            Icon(Icons.Filled.Add, "")
        }

        // on below line adding a spacer
        Spacer(modifier = Modifier.height(20.dp))

        // on below line we are creating
        // a square floating action button
        FloatingActionButton(
            // on below line we are
            // adding on click for our fab
            onClick = {
                Toast.makeText(ctx, "Square Floating Action Button", Toast.LENGTH_SHORT).show()
            },
            // on below line we are
            // specifying shape for our button
            shape = RectangleShape,
            // on below line we are
            // adding background color.
            backgroundColor = greenColor,
            // on below line we are
            // adding content color.
            contentColor = Color.White
        ) {
            // on below line we are
            // adding icon for fab.
            Icon(Icons.Filled.Add, "")
        }

        // on below line adding a spacer
        Spacer(modifier = Modifier.height(20.dp))

        // on below line we are creating
        // an extended floating action button.
        ExtendedFloatingActionButton(
            // on below line we are setting text for our fab
            text = { Text(text = "Extended FAB") },
            // on below line we are adding click listener.
            onClick = {
                Toast.makeText(ctx, "Extended Floating Action Button", Toast.LENGTH_SHORT).show()
            },
            // on below line adding
            // a background color.
            backgroundColor = greenColor,
            // on below line we are
            // adding a content color.
            contentColor = Color.White,
            // on below line we are
            // adding icon for our fab
            icon = { Icon(Icons.Filled.Add, "") }
        )
    }
}

Now run your application to see the output of it. 

Output: