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How to Keep Device Screen On in Android using Jetpack Compose?

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Many times while building an android application we have to make sure that the user’s device screen remains on. In the video player application, we can see that the user’s device screen remains on until the video is not completed. For this, we have to keep the device screen on. In this article, we will look at How to keep the device screen on in an 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




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.content.Intent
import android.os.Build
import android.os.Bundle
import android.provider.Settings.*
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 androidx.core.content.ContextCompat.startActivity
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 
                                    // title 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 
                        // our method to display UI
                        screenON(LocalContext.current)
                    }
                }
            }
        }
        // on below line we are keeping screen as ON.
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
    }
  
}
  
@Composable
fun screenON(
    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 adding a text for heading.
        Text(
            // on below line we are specifying text
            text = "Screen On 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 we are creating a simple 
        // text view for displaying a text.
        Text(
            text = "Welcome to Geeks for Geeks",
            style = TextStyle(color = Color.Black, fontSize = 20.sp, fontWeight = FontWeight.Bold)
        )
  
        // adding spacer on below line.
        Spacer(modifier = Modifier.height(10.dp))
  
    }
}


Output:

How to Keep Device Screen On in Android using Jetpack Compose oUTPUT

 



Last Updated : 15 Sep, 2022
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