Increase or Decrease the Volume Programmatically in Android using Jetpack Compose

Many times while building an android application such as using an audio player like a music player. We have to add functionality to add a volume controller for our media player within our application. So that we can control the volume of our media player. In this article, we will take a look at How to adjust the volume of an android phone programmatically in android using Jetpack Compose. 

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: Adding a new color to the Color.kt file

Navigate to app > java > your app’s package name > ui.theme > Color.kt file and add the below code to it. 

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.content.Context
import android.content.Context.AUDIO_SERVICE
import android.media.AudioManager
import android.os.Bundle
import android.util.Log
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.BorderStroke
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material.*
import androidx.compose.runtime.Composable
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.SolidColor
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import com.example.newcanaryproject.ui.theme.NewCanaryProjectTheme
import com.example.newcanaryproject.ui.theme.greenColor
import com.github.skydoves.colorpicker.compose.*

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 = "GFG",

                                        // 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 color picker method
                        volumeController(LocalContext.current)
                    }
                }
            }
        }
    }
}

@Composable
fun volumeController(context: Context) {

    // Declare an audio manager
    val audioManager = context.getSystemService(AUDIO_SERVICE) as AudioManager

    // on below line we are creating variables for
    // volume level, max volume, volume percent.
    val volumeLevel = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC)
    val maxVolumeLevel = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC)
    val volumePercent = (volumeLevel.toFloat() / maxVolumeLevel * 100).toInt()

    // on below line we are creating a variable
    // for current volume and initializing it.
    val currentVolume = remember {
        mutableStateOf(volumePercent)
    }

    // on below line we are creating a column,
    Column(
        // on below line we are adding a modifier to it,
        modifier = Modifier
            .fillMaxSize()
            // on below line we are adding a padding.
            .padding(all = 30.dp),
        horizontalAlignment = Alignment.CenterHorizontally,
        verticalArrangement = Arrangement.Center,
    ) {

        // on below line we are displaying a
        // text as volume controller.
        Text(
            text = "Volume Controller",
            // on below line we are adding font weight
            fontWeight = FontWeight.Bold,

            // on below line we are adding font size.
            fontSize = 20.sp,

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

        // on below line we are creating text to display volume level.
        Text(
            text = "Volume Level : " + currentVolume.value,
            // on below line we are adding font weight.
            fontWeight = FontWeight.Bold,
            // on below line we are adding font size and color.
            fontSize = 20.sp,
            color = greenColor
        )

        // on below line we are creating a row for buttons.
        Row(modifier = Modifier.padding(4.dp)) {

            // below line is use to create a button.
            Button(
                // below line is use to add onclick
                // parameter for our button onclick
                onClick = {
                    // on below line we are increasing our volume.
                    audioManager.adjustVolume(
                        AudioManager.ADJUST_RAISE,
                        AudioManager.FLAG_PLAY_SOUND
                    )
                    // on below line we are getting our current volume level.
                    val volumeLevel = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC)
                    val maxVolumeLevel = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC)
                    val volumePercent = (volumeLevel.toFloat() / maxVolumeLevel * 100).toInt()
                    currentVolume.value = volumePercent
                },
                // in below line we are using modifier
                // which is use to add padding to our button
                modifier = Modifier.padding(all = Dp(10F)),

                // below line is use to set or
                // button as enable or disable.
                enabled = true,

                // below line is use to
                // add border to our button.
                border = BorderStroke(width = 1.dp, brush = SolidColor(Color.Blue)),

                // below line is use to add shape for our button.
                shape = MaterialTheme.shapes.medium,
                // on below line we are updating color for our button.
                colors = ButtonDefaults.buttonColors(backgroundColor = greenColor),
            ) {
                // on below line we are adding text for our button.
                Text(text = "+")
            }

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

            // below line is use to create a button.
            Button(
                // below line is use to add onclick
                // parameter for our button onclick
                onClick = {
                    // on below line we are decreasing volume
                    audioManager.adjustVolume(
                        AudioManager.ADJUST_LOWER,
                        AudioManager.FLAG_PLAY_SOUND
                    )
                    // on below line we are getting our current volume level.
                    val volumeLevel = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC)
                    val maxVolumeLevel = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC)
                    val volumePercent = (volumeLevel.toFloat() / maxVolumeLevel * 100).toInt()
                    currentVolume.value = volumePercent
                },

                // on below line we are updating color for our button.
                colors = ButtonDefaults.buttonColors(backgroundColor = greenColor),

                // in below line we are using modifier
                // which is use to add padding to our button
                modifier = Modifier.padding(all = Dp(10F)),

                // below line is use to set or
                // button as enable or disable.
                enabled = true,

                // below line is use to
                // add border to our button.
                border = BorderStroke(width = 1.dp, brush = SolidColor(Color.Blue)),

                // below line is use to add shape for our button.
                shape = MaterialTheme.shapes.medium,
            ) {
                // on below line we are creating a text.
                Text(text = "-")
            }
        }
    }
}

Now run your application to see the output of the application. 

Output: