Get Battery Level in Android using Jetpack Compose

Many times while building an android application if we have to run specific features within our android application we have to check the battery level of our android device. In this article, we will take a look at How to Check Battery Level 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: 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.Manifest
import android.bluetooth.BluetoothAdapter
import android.content.Context
import android.content.Context.AUDIO_SERVICE
import android.content.Context.BATTERY_SERVICE
import android.content.pm.PackageManager
import android.media.AudioManager
import android.os.BatteryManager
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 androidx.core.app.ActivityCompat
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 get battery
                        // level method to get current battery percentage.
                        getBatteryLevel(LocalContext.current)
                    }
                }
            }
        }
    }
}

@Composable
fun getBatteryLevel(context: Context) {
    // 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 = "Battery Level Indicator",
            // 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,
        )

        // Call battery manager service
        val batteryManager = context.getSystemService(BATTERY_SERVICE) as BatteryManager

        // Get the battery percentage and store it in a INT variable
        val batLevel: Int = batteryManager.getIntProperty(BatteryManager.BATTERY_PROPERTY_CAPACITY)

        // on below line we are creating
        // text to display battery level.
        Text(
            text = "Battery Level : "+batLevel,
            // 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
        )
    }
}

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

Output: