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Title: Android Jetpack: Understand the CameraX Camera-Support Library (Google I/O'19)
Speaker(s): Vinit Modi, James Fung, Franklin Wu, Trevor McGuire
1. 카메라 개발은 어렵습니다. 이유는?
- 앱에서 다양한 OS별로 신경써야함
- 저가형 entry부터 고가의 flagship까지 일관성이 있어야함
- 카메라 API의 복잡성
2. (testlab에서 테스트 다 하면서 개발했다는) CamaraX
- 현 시장의 90%에 가까운 기기에서 호환됨
- target SDK가 API 21 이상이면 사용 가능
- Camera1 Api 및 Camera2 Legay Layer와 일관되게 제공됨.
- 사용하기 쉬워짐
- Lifecycle aware: Preview, Image Analysis, Caputre 기능 -> 각 개별 thread 필요 없어짐
-
3. 사용 예제
1) Preview
/*display preview on screen*/
//configure preview
val previewConfig = PreviewConfig.Builder().build()
//create preview
val preview = Preview(previewConfig)
preview.setOnPreviewOutputUpdateListener {
PreviewOutput : Preview.PreviewOutput? ->
// your code here. e.g. use previewOutput?.surfaceTexture
// and post to a GL renderer.
}
//attach preview to lifecycle
CameraX.bindToLifecycle(this as LifecycleOwner, preview)
2) Image Analysis
//configure image analysis
//set resolution
val imageAnalysisConfig = ImageAnalysisConfig.Builder()
.setTargetResolution(Size(1280, 720))
.build()
//create image analysis
val imageAnalysis = ImageAnalysis(imageAnalysisConfig)
//attach output
imageAnalysis.setAnalyzer({ image : ImageProxy, rotationDegrees : Int ->
val cropRect = image.cropRect
//insert your code here
})
//attach image analysis & preview to lifecycle
CameraX.bindToLifecycle(this as LifecycleOwner, imageAnalysis, preview)
3) Image Capture
/*configure image capture*/
//manage rotation
val imageCaptureConfig = ImageCaptureConfig.Builder()
.setTargetRotation(windowManager.defaultDisplay.rotation)
.build()
//create image capture
val imageCapture = ImageCapture(imageCaptureConfig)
//bind all use cases
CameraX.bindToLifecycle(this as LifecycleOwner, imageCapture, imageAnalysis, preview)
//on user action save a picture
fun onClick() {
val file = File(...)
imageCapture.takePicture(file,
object : ImageCapture.OnImageSavedListener {
override fun onError(error: ImageCapture.UserCaseError,
message: String, exc: Throwable?){
// insert your code here
}
override fun onImageSaved(file: File) {
// insert your code here
}
})
}
Reference
https://www.youtube.com/watch?v=kuv8uK-5CLY
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