How to Check if the Battery is Charging or not in Android Programmatically using Jetpack Compose?

Many times while building an android application we have to check the charging status of the battery whether the battery is currently charging or not. For checking the battery charging status within the android application. We use battery manager. In this article, we will take a look at How to use Battery Manager to check battery charging status within the android application 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

import androidx.compose.ui.graphics.Color

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

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

Step 3: Working with MainActivity.kt file. 

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

Kotlin

import android.app.Activity
import android.content.Context
import android.content.Intent
import android.content.IntentFilter
import android.os.BatteryManager
import android.os.Build
import android.os.Bundle
import android.view.WindowManager
import android.widget.Toast
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.annotation.RequiresApi
import androidx.compose.foundation.layout.*
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.graphics.Color
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.text.TextStyle
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.dp
import androidx.compose.ui.unit.sp
import com.example.newcanaryproject.ui.theme.NewCanaryProjectTheme
import com.example.newcanaryproject.ui.theme.greenColor

class MainActivity : ComponentActivity() {
    @RequiresApi(Build.VERSION_CODES.M)
    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 connection information method to display UI
                        batteryStatus(LocalContext.current)
                    }
                }
            }
        }
    }
}

// on below line we are creating battery status function.
@Composable
fun batteryStatus(context: Context) {
    val activity = context as Activity
    // on below line creating a variable for battery status
    val batteryStats = remember {
        mutableStateOf("")
    }

    val batteryStatus: Intent? = IntentFilter(Intent.ACTION_BATTERY_CHANGED).let { ifilter ->
        context.registerReceiver(null, ifilter)
    }
    // 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 adding a text for heading.
        Text(
            // on below line we are specifying text
            text = "Battery Charging Status in Android",
            // on below line we are specifying text color, font size and font weight
            color = greenColor, fontSize = 20.sp, fontWeight = FontWeight.Bold
        )

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

        // on below line creating a text for displaying battery charging status
        Text(
            // on below line we are specifying text
            text = batteryStats.value,
            // on below line we are specifying text color, font size and font weight
            color = greenColor, fontSize = 20.sp, fontWeight = FontWeight.Bold
        )

        // on below line adding a spacer.
        Spacer(modifier = Modifier.height(20.dp))
        // on below line creating a button to check battery charging status
        Button(onClick = {
            val batteryStatus: Intent? =
                IntentFilter(Intent.ACTION_BATTERY_CHANGED).let { ifilter ->
                    context.registerReceiver(null, ifilter)
                }

            // isCharging if true indicates charging is ongoing and vice-versa
            val status: Int = batteryStatus?.getIntExtra(BatteryManager.EXTRA_STATUS, -1) ?: -1
            val isCharging: Boolean = status == BatteryManager.BATTERY_STATUS_CHARGING
                    || status == BatteryManager.BATTERY_STATUS_FULL

            // Display whatever the state in the form of a Toast
            if (isCharging) {
                batteryStats.value = "Battery Charging"
            } else {
                batteryStats.value = "Battery Not Charging"
            }
        }) {
            // on below line adding a text for our button.
            Text(text = "Check Battery Status", color = Color.White)
        }
    }
}

Output: