Android Compose: how to get notification permission

Question

I need to get permission to turn do not disturb mode on or off. Normally, without composing I would use the following code and check the result of the launched activity:

val mNotificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
    if (!mNotificationManager.isNotificationPolicyAccessGranted) {
        val intentNotifica = Intent(Settings.ACTION_NOTIFICATION_POLICY_ACCESS_SETTINGS)
        startActivity(intentNotifica)
    }

But with jetpack compose I would not know how to check if the user has obtained the permissions or not. For example, with the following code, I cannot know, after the user has pressed the button, if the permissions have been obtained or not:

fun DoNotDisturbPermission() {

val context = LocalContext.current
val hasPermission = context.getSystemService(NOTIFICATION_SERVICE) as NotificationManager

if (!hasPermission.isNotificationPolicyAccessGranted) {
    Button(onClick = {
        val intentNotifica = Intent(Settings.ACTION_NOTIFICATION_POLICY_ACCESS_SETTINGS)
        context.startActivity(intentNotifica)
    }) {
        Text("get permission")
    }
} else {
    Text("Already granted")
}}

Also, I tried to use the Accompanist library with rememberPermissionState(Manifest.permission.ACCESS_NOTIFICATION_POLICY), but it doesn't work properly.

Answer 1

This is how I do it. I have the files below in a Permissions package in my Utils package.

Permission Checker:

   @Composable
    fun checkNotificationPolicyAccess(
        notificationManager: NotificationManager,
        context: Context
    ): Boolean {
        if (notificationManager.isNotificationPolicyAccessGranted) {
            return true
        } else {
            PermissionDialog(context)
        }
        return false
    }

Permission Dialog:

@OptIn(ExperimentalComposeUiApi::class)
@Composable
fun PermissionDialog(context: Context) {
    val openDialog = remember { mutableStateOf(true) }

    if (openDialog.value) {
        AlertDialog(
            properties = DialogProperties(
                usePlatformDefaultWidth = true
            ),
            title = { Text("Permission Needed") },
            text = {
                Text("Allow ******* to access Do Not Disturb Settings? Pressing 'No' will close the app as it cannot work without access. Thanks.")
            },
            onDismissRequest = { openDialog.value = true },

            dismissButton = {
                Button(
                    onClick = {
                        exitProcess(0)
                    },
                    colors = ButtonDefaults.buttonColors(Color(0xffFF9800))
                ) {
                    Text(text = "No")
                }
            },
            confirmButton = {
                Button(
                    onClick = {
                        openDialog.value = false
                        val intent = Intent(Settings.ACTION_NOTIFICATION_POLICY_ACCESS_SETTINGS)
                        startActivity(context, intent, null)

                    },
                    colors = ButtonDefaults.buttonColors(Color(0xffFF9800))
                ) {
                    Text(text = "Yes")
                }
            }
        )
    }
}

Then my main activity looks like this:

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        val notificationManager: NotificationManager =
            getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

        setContent {
            MyTheme {
                // A surface container using the 'background' color from the theme
                Surface(
                    modifier = Modifier.fillMaxSize(),
                    color = MaterialTheme.colors.background
                ) {   
                    checkNotificationPolicyAccess(notificationManager, this)
                    HomePage()
                }
            }
        }
    }
}