Getting Started with CameraX

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Getting Started with CameraX @owahltinez @calren24

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Camera Development can be difficult and frustrating

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Camera Development can be difficult and frustrating ● Supporting different API versions

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Camera Development can be difficult and frustrating ● Supporting different API versions ● Providing consistency across devices

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Camera Development can be difficult and frustrating ● Supporting different API versions ● Providing consistency across devices ● Understanding the complex camera API

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Camera Development can be difficult and frustrating ● Supporting different API versions ● Providing consistency across devices ● Understanding the complex camera API CameraX support library aims to help solve these problems

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CameraX ● Backwards compatible to L (90% of devices)

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CameraX ● Backwards compatible to L (90% of devices) ● Consistent behavior across devices

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CameraX ● Backwards compatible to L (90% of devices) ● Consistent behavior across devices ● Easy to use APIs

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Using CameraX results in 70% fewer lines of code vs camera2

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Preview Image Analysis Capture

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Preview Image Analysis Capture

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// configure preview val previewConfig = PreviewConfig.Builder().build()t .setTargetRotation(Surface.ROTATION_180) his as LifecycleOwner, preview)

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// create preview val previewConfig = PreviewConfig.Builder().build() .setTargetRotation(Surface.ROTATION_180) val preview = Preview(previewConfig)wner, preview)

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// attach output to view val previewConfig = PreviewConfig.Builder().build() .setTargetRotation(Surface.ROTATION_180) val preview = Preview(previewConfig) preview.setOnPreviewOutputUpdateListener { previewOutput: Preview.PreviewOutput? -> //your code here. e.g. use previewOutput?.surfaceTexture //and post to a GL renderer. } CameraX.bindToLifecycle(this as LifecycleOwner, preview)

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// attach preview to lifecycle val previewConfig = PreviewConfig.Builder().build() .setTargetRotation(Surface.ROTATION_180) val preview = Preview(previewConfig) preview.setOnPreviewOutputUpdateListener { previewOutput: Preview.PreviewOutput? -> //your code here. e.g. use previewOutput?.surfaceTexture //and post to a GL renderer. } CameraX.bindToLifecycle(this as LifecycleOwner, preview)

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// display preview on screen val previewConfig = PreviewConfig.Builder().build() .setTargetRotation(Surface.ROTATION_180) val preview = Preview(previewConfig) preview.setOnPreviewOutputUpdateListener { previewOutput: Preview.PreviewOutput? -> //your code here. e.g. use previewOutput?.surfaceTexture //and post to a GL renderer. } CameraX.bindToLifecycle(this as LifecycleOwner, preview)

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Preview Image Analysis Capture

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// configure image analysis val imageAnalysisConfig = ImageAnalysisConfig.Builder()

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// set resolution val imageAnalysisConfig = ImageAnalysisConfig.Builder() .setTargetResolution(Size(1280, 720)) .build()

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// create image analysis val imageAnalysisConfig = ImageAnalysisConfig.Builder() .setTargetResolution(Size(1280, 720)) .build() val imageAnalysis = ImageAnalysis(imageAnalysisConfig)

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// attach output val imageAnalysisConfig = ImageAnalysisConfig.Builder() .setTargetResolution(Size(1280, 720)) .build() val imageAnalysis = ImageAnalysis(imageAnalysisConfig) imageAnalysis.setAnalyzer({ image: ImageProxy, rotationDegrees: Int -> val cropRect = image.cropRect // do some analysis })

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// attach image analysis & preview to lifecycle val imageAnalysisConfig = ImageAnalysisConfig.Builder() .setTargetResolution(Size(1280, 720)) .build() val imageAnalysis = ImageAnalysis(imageAnalysisConfig) imageAnalysis.setAnalyzer({ image: ImageProxy, rotationDegrees: Int -> val cropRect = image.cropRect // do some analysis }) CameraX.bindToLifecycle(this as LifecycleOwner, imageAnalysis, preview)

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// full setup to process images val imageAnalysisConfig = ImageAnalysisConfig.Builder() .setTargetResolution(Size(1280, 720)) .build() val imageAnalysis = ImageAnalysis(imageAnalysisConfig) imageAnalysis.setAnalyzer({ image: ImageProxy, rotationDegrees: Int -> val cropRect = image.cropRect // do some analysis }) CameraX.bindToLifecycle(this as LifecycleOwner, imageAnalysis, preview)

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Preview Image Analysis Capture

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// configure image capture val imageCaptureConfig = ImageCaptureConfig.Builder() .setTargetResolution(Size(1280, 720)) .build()

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// create image capture val imageCaptureConfig = ImageCaptureConfig.Builder() .setTargetResolution(Size(1280, 720)) .build() val imageCapture = ImageCapture(imageCaptureConfig)

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// bind all use cases val imageCaptureConfig = ImageCaptureConfig.Builder() .setTargetResolution(Size(1280, 720)) .build() val imageCapture = ImageCapture(imageCaptureConfig) CameraX.bindToLifecycle(this as LifecycleOwner, imageCapture, imageAnalysis, preview)

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// full setup to capture images val imageCaptureConfig = ImageCaptureConfig.Builder() .setTargetResolution(Size(1280, 720)) .build() val imageCapture = ImageCapture(imageCaptureConfig) CameraX.bindToLifecycle(this as LifecycleOwner, imageCapture, imageAnalysis, preview)

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// on user action

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// on user action fun onClick() { val file = File(..) imageCaptureUseCase.takePicture(file, object : ImageCaptureUseCase.OnImageSavedListener { override fun onError(error: ImageCaptureUseCase.UseCaseError, message: String, exc: Throwable?) { //insert your code here } override fun onImageSaved(file: File) { //insert your code here } }) }

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// on user action save a picture fun onClick() { val file = File(..) imageCapture.takePicture(file, object : ImageCaptureUseCase.OnImageSavedListener { override fun onError(error: ImageCaptureUseCase.UseCaseError, message: String, exc: Throwable?) { //insert your code here } override fun onImageSaved(file: File) { //insert your code here } }) }

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// save a picture on user action fun onClick() { val file = File(..) imageCapture.takePicture(file, object : ImageCapture.OnImageSavedListener { override fun onError(error: ImageCapture.UseCaseError, message: String, exc: Throwable?) { //insert your code here } override fun onImageSaved(file: File) { //insert your code here } }) }

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CameraX sample app g.co/camerax/sample CameraX dev mailing list g.co/camerax/developers CameraX StackOverflow tag stackoverflow.com/tags/android-camerax

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CameraX sample app

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CameraX sample app ● Under Android camera samples GitHub repo

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CameraX sample app ● Under Android camera samples GitHub repo ● Monitoring all repo issues and pull requests

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CameraX sample app ● Under Android camera samples GitHub repo ● Monitoring all repo issues and pull requests ● Sample issues != CameraX library issues

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CameraX sample app (cont)

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CameraX sample app (cont) ● Very basic indeed

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CameraX sample app (cont) ● Very basic indeed ● Preview, image capture and image analysis

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CameraX sample app (cont) ● Very basic indeed ● Preview, image capture and image analysis ● Future work: vendor extensions and video record

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CameraX sample app ● Very basic indeed ● Preview, image capture and image analysis ● Future work: vendor extensions and video record

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Handling state changes beyond Lifecycle

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Handling state changes beyond Lifecycle ● Preview output update (CameraX internals)

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Handling state changes beyond Lifecycle ● Preview output update (CameraX internals) ● Layout (TextureView lifecycle)

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Handling state changes beyond Lifecycle ● Preview output update (CameraX internals) ● Layout (TextureView lifecycle) ● Display (180 rotations, display removed / attached)

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Handling state changes beyond Lifecycle ● Preview output update (CameraX internals) ● Layout (TextureView lifecycle) ● Display (180 rotations, display removed / attached) ● Camera hardware (USB, retractable)

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// Preview output update listener val preview: Preview = ... val viewFinder: TextureView = ... preview.setOnPreviewOutputUpdateListener { previewOutput: Preview.PreviewOutput? -> // Remove it and re-add view (important!) val parent = viewFinder.parent as ViewGroup parent.removeView(viewFinder) parent.addView(viewFinder, 0) // Update internal Surface object viewFinder.surfaceTexture = previewOutput.surfaceTexture // Apply preview output transformations // TODO: Use PreviewOutput textureSize and rotationDegrees here }

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// Preview output transformation View Finder

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// Preview output transformation + View Finder Preview Output

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// Preview output transformation = + View Finder Preview Output Result

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// Preview output transformation = + View Finder Preview Output Fit

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// Preview output transformation = + View Finder Preview Output Letterbox

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// Preview output transformation = + View Finder Preview Output Center Crop

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// Preview output transformation Center Crop Letterbox Fit

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// Layout change listener val viewFinder: TextureView = ... viewFinder.addOnLayoutChangeListener { view, left, top, right, bottom, _, _, _, _ -> val newDimens = Size(right - left, bottom - top) // Apply preview output transformations // TODO: Use `newDimens` here }

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// Display listener val viewFinder: TextureView = ... val viewFinderDisplayId: Int = viewFinder.display.displayId

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// Display listener val viewFinder: TextureView = ... val viewFinderDisplayId: Int = viewFinder.display.displayId val displayListener = object : DisplayManager.DisplayListener { override fun onDisplayAdded(displayId: Int) = Unit override fun onDisplayRemoved(displayId: Int) = Unit override fun onDisplayChanged(displayId: Int) { if (displayId == viewFinderDisplayId) { val display = viewFinder.display // Apply preview output transformations // TODO: Use `display.rotation` here } } }

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// Preview output transformation

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// Preview output transformation // Option 1: apply rotation to view finder (on top of previous transformations) val matrix: Matrix = ... matrix.postRotate(-rotationDegrees, centerX, centerY)

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// Preview output transformation // Option 1: apply rotation to view finder (on top of previous transformations) val matrix: Matrix = ... matrix.postRotate(-rotationDegrees, centerX, centerY) // Option 2: apply rotation to preview use case, which will trigger // Preview.OnPreviewOutputUpdateListener val preview: Preview = ... preview.setTargetRotation(display.rotation)

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Handling state changes beyond Lifecycle

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Handling state changes beyond Lifecycle ● Use AutoFitPreviewBuilder from the sample

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@calren24 Start exploring CameraX today! @owahltinez