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added barcode scanner implementation
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99 changes: 99 additions & 0 deletions
99
...c/main/java/com/example/jetpack_compose_all_in_one/demos/barcode_scanner/CameraPreview.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| package com.example.jetpack_compose_all_in_one.demos.barcode_scanner | ||
|
|
||
| import android.util.Size | ||
| import android.view.ViewGroup | ||
| import androidx.camera.core.CameraSelector | ||
| import androidx.camera.core.ImageAnalysis | ||
| import androidx.camera.core.Preview | ||
| import androidx.camera.lifecycle.ProcessCameraProvider | ||
| import androidx.camera.view.PreviewView | ||
| import androidx.compose.runtime.Composable | ||
| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.platform.LocalContext | ||
| import androidx.compose.ui.viewinterop.AndroidView | ||
| import androidx.core.content.ContextCompat | ||
| import androidx.lifecycle.LifecycleOwner | ||
| import com.google.mlkit.vision.barcode.BarcodeScannerOptions | ||
| import com.google.mlkit.vision.barcode.BarcodeScanning | ||
| import com.google.mlkit.vision.barcode.common.Barcode | ||
| import com.google.mlkit.vision.common.InputImage | ||
| import java.util.concurrent.Executors | ||
|
|
||
| enum class ScanMode { | ||
| QR_CODE, | ||
| BARCODE, | ||
| BOTH | ||
| } | ||
| @Composable | ||
| @androidx.annotation.OptIn(androidx.camera.core.ExperimentalGetImage::class) | ||
| @androidx.camera.core.ExperimentalGetImage | ||
| fun CameraPreview( | ||
| modifier: Modifier, | ||
| onBarcodeDetected: (Barcode) -> Unit, | ||
| scanMode: ScanMode = ScanMode.BOTH | ||
| ) { | ||
| val context = LocalContext.current | ||
| val lifecycleOwner = LocalContext.current as LifecycleOwner | ||
| val cameraExecutor = Executors.newSingleThreadExecutor() | ||
| val options = when (scanMode) { | ||
| ScanMode.QR_CODE -> BarcodeScannerOptions.Builder() | ||
| .setBarcodeFormats(Barcode.FORMAT_QR_CODE) | ||
| .build() | ||
| ScanMode.BARCODE -> BarcodeScannerOptions.Builder() | ||
| .setBarcodeFormats(Barcode.FORMAT_CODE_128, Barcode.FORMAT_CODE_39) | ||
| .build() | ||
| ScanMode.BOTH -> BarcodeScannerOptions.Builder() | ||
| .setBarcodeFormats(Barcode.FORMAT_ALL_FORMATS) | ||
| .build() | ||
| } | ||
| val barcodeScanner = BarcodeScanning.getClient(options) | ||
|
|
||
| AndroidView( | ||
| modifier = modifier, | ||
| factory = { context -> | ||
| val previewView = PreviewView(context).apply { | ||
| layoutParams = ViewGroup.LayoutParams( | ||
| ViewGroup.LayoutParams.MATCH_PARENT, | ||
| ViewGroup.LayoutParams.MATCH_PARENT | ||
| ) | ||
| } | ||
|
|
||
| val cameraProviderFuture = ProcessCameraProvider.getInstance(context) | ||
| cameraProviderFuture.addListener({ | ||
| val cameraProvider: ProcessCameraProvider = cameraProviderFuture.get() | ||
| val preview = Preview.Builder().build().also { | ||
| it.setSurfaceProvider(previewView.surfaceProvider) | ||
| } | ||
|
|
||
| val imageAnalysis = ImageAnalysis.Builder() | ||
| .setTargetResolution(Size(1280, 720)) | ||
| .setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST) | ||
| .build() | ||
| .also { | ||
| it.setAnalyzer(cameraExecutor, { imageProxy -> | ||
| val mediaImage = imageProxy.image | ||
| if (mediaImage != null) { | ||
| val image = InputImage.fromMediaImage(mediaImage, imageProxy.imageInfo.rotationDegrees) | ||
| barcodeScanner.process(image) | ||
| .addOnSuccessListener { barcodes -> | ||
| for (barcode in barcodes) { | ||
| onBarcodeDetected(barcode) | ||
| } | ||
| } | ||
| .addOnCompleteListener { | ||
| imageProxy.close() | ||
| } | ||
| } | ||
| }) | ||
| } | ||
| try { | ||
| cameraProvider.unbindAll() | ||
| cameraProvider.bindToLifecycle(lifecycleOwner, CameraSelector.DEFAULT_BACK_CAMERA, preview, imageAnalysis) | ||
| } catch (e: Exception) { | ||
| e.printStackTrace() | ||
| } | ||
| }, ContextCompat.getMainExecutor(context)) | ||
| previewView | ||
| } | ||
| ) | ||
| } |
57 changes: 57 additions & 0 deletions
57
app/src/main/java/com/example/jetpack_compose_all_in_one/demos/barcode_scanner/ScannerApp.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| package com.example.jetpack_compose_all_in_one.demos.barcode_scanner | ||
|
|
||
| import androidx.activity.compose.rememberLauncherForActivityResult | ||
| import androidx.activity.result.contract.ActivityResultContracts | ||
| import androidx.compose.runtime.Composable | ||
| import androidx.compose.runtime.LaunchedEffect | ||
| import androidx.compose.runtime.getValue | ||
| import androidx.compose.runtime.mutableStateOf | ||
| import androidx.compose.runtime.remember | ||
| import androidx.compose.runtime.setValue | ||
| import android.Manifest | ||
| import androidx.compose.foundation.layout.Column | ||
| import androidx.compose.foundation.layout.Row | ||
| import androidx.compose.foundation.layout.padding | ||
| import androidx.compose.material3.RadioButton | ||
| import androidx.compose.material3.Text | ||
| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.unit.dp | ||
|
|
||
| @Composable | ||
| @androidx.annotation.OptIn(androidx.camera.core.ExperimentalGetImage::class) | ||
| fun ScannerApp() { | ||
| var scanMode by remember { mutableStateOf(ScanMode.BOTH) } | ||
| var lastScannedCode by remember { mutableStateOf("") } | ||
| var hasCameraPermission by remember { mutableStateOf(false) } | ||
|
|
||
| val permissionResult = rememberLauncherForActivityResult( | ||
| contract = ActivityResultContracts.RequestPermission(), | ||
| onResult = { hasCameraPermission = it } | ||
| ) | ||
|
|
||
| LaunchedEffect(key1 = true) { | ||
| permissionResult.launch(Manifest.permission.CAMERA) | ||
| } | ||
|
|
||
| Column { | ||
| Row { | ||
| Text(text = "QR Code") | ||
| RadioButton(selected = scanMode == ScanMode.QR_CODE, onClick = { scanMode = ScanMode.QR_CODE }) | ||
| Text(text = "Barcode") | ||
| RadioButton(selected = scanMode == ScanMode.BARCODE, onClick = { scanMode = ScanMode.BARCODE }) | ||
| Text(text = "Both") | ||
| RadioButton(selected = scanMode == ScanMode.BOTH, onClick = { scanMode = ScanMode.BOTH }) | ||
| } | ||
| if (hasCameraPermission) { | ||
| CameraPreview( | ||
| modifier = Modifier.weight(1f), | ||
| onBarcodeDetected = { barcode -> | ||
| lastScannedCode = barcode.rawValue ?: "No barcode data" | ||
| }, | ||
| scanMode = scanMode) | ||
| Text(text = "Last Scanned Code: $lastScannedCode") | ||
| } else { | ||
| Text(text = "Camera permission not granted") | ||
| } | ||
| } | ||
| } |
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