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feat(app): add PreviewViewComposable to show the camera preview stream
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app/src/main/kotlin/com/intelligentbackpack/app/ui/common/PreviewViewComposable.kt
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package com.intelligentbackpack.app.ui.common | ||
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import android.util.Log | ||
import androidx.camera.core.CameraSelector | ||
import androidx.camera.core.ImageAnalysis | ||
import androidx.camera.core.ImageCapture | ||
import androidx.camera.core.Preview | ||
import androidx.camera.lifecycle.ProcessCameraProvider | ||
import androidx.camera.view.PreviewView | ||
import androidx.compose.runtime.Composable | ||
import androidx.compose.runtime.DisposableEffect | ||
import androidx.compose.ui.Modifier | ||
import androidx.compose.ui.platform.LocalLifecycleOwner | ||
import androidx.compose.ui.viewinterop.AndroidView | ||
import androidx.core.content.ContextCompat | ||
import com.intelligentbackpack.app.sensor.BarcodeAnalyser | ||
import java.util.concurrent.Executors | ||
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@androidx.camera.core.ExperimentalGetImage | ||
@Composable | ||
fun PreviewViewComposable(modifier: Modifier, barcodeAnalyser: BarcodeAnalyser) { | ||
val lifecycleOwner = LocalLifecycleOwner.current | ||
var cameraProvider: ProcessCameraProvider? = null | ||
DisposableEffect(key1 = cameraProvider) { | ||
onDispose { | ||
cameraProvider?.unbindAll() // closes the camera | ||
} | ||
} | ||
AndroidView( | ||
{ context -> | ||
val cameraExecutor = Executors.newSingleThreadExecutor() | ||
val previewView = PreviewView(context).also { | ||
it.scaleType = PreviewView.ScaleType.FILL_CENTER | ||
} | ||
val cameraProviderFuture = ProcessCameraProvider.getInstance(context) | ||
cameraProviderFuture.addListener({ | ||
cameraProvider = cameraProviderFuture.get() | ||
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val preview = Preview.Builder() | ||
.build() | ||
.also { | ||
it.setSurfaceProvider(previewView.surfaceProvider) | ||
} | ||
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val imageCapture = ImageCapture.Builder().build() | ||
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val imageAnalyzer = ImageAnalysis.Builder() | ||
.setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST) | ||
.build() | ||
.apply { | ||
setAnalyzer(cameraExecutor, barcodeAnalyser) | ||
} | ||
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val cameraSelector = CameraSelector.Builder() | ||
.requireLensFacing(CameraSelector.LENS_FACING_BACK) | ||
.build() | ||
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try { | ||
// Unbind use cases before rebinding | ||
cameraProvider?.unbindAll() | ||
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// Bind use cases to camera | ||
cameraProvider?.bindToLifecycle( | ||
lifecycleOwner, cameraSelector, preview, imageCapture, imageAnalyzer | ||
) | ||
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} catch (exc: Exception) { | ||
Log.e("DEBUG", "Use case binding failed", exc) | ||
} | ||
}, ContextCompat.getMainExecutor(context)) | ||
previewView | ||
}, | ||
modifier = modifier | ||
) | ||
} |