Scan.kt

@Composable
fun TimeEntry() {
  val currentContext = LocalContext.current
   val barcodeLauncher = rememberLauncherForActivityResult(ScanContract(), onResult = { result ->
            if(result.contents != null) {
               Toast.makeText(currentContext, result.contents, Toast.SHORT).show()
            }
   }
   
   val scanOptions = ScanOptions().apply {
            setDesiredBarcodeFormats(ScanOptions.QR_CODE)
            setPrompt("Scan a barcode")
            setBeepEnabled(true)
            setBarcodeImageEnabled(true)
            setOrientationLocked(false)
        }
   
   Column(
        modifier = Modifier.fillMaxSize(),
        verticalArrangement = Arrangement.Center
     ){
     
     Button(
                modifier = Modifier.align(Alignment.CenterHorizontally),
                shape = RoundedCornerShape(10.dp),
                onClick = {
                    barcodeLauncher.launch(scanOptions)
                }
            ) {
                Text(text = "Start Scan")
            }
   }
  
  // Note: add these dependencies to the build.gradle
  // qr code reader & generator - https://github.com/journeyapps/zxing-android-embedded
  //  implementation('com.journeyapps:zxing-android-embedded:4.3.0') { transitive = false }
  //  implementation 'com.google.zxing:core:3.4.1'
  
 // in the Androidmanifest.xml add this line

// <activity
//                android:name="com.journeyapps.barcodescanner.CaptureActivity"
//                android:screenOrientation="portrait"
 //               tools:replace="screenOrientation" />
  
}