Merge pull request #354 from aarongrider/android-lifecycle
Fix Android camera lifecycle
This commit is contained in:
Aaron Grider
GitHub
commit
feacdfb0bf
@ -9,11 +9,11 @@ import android.content.ContentValues
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import android.content.Context
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import android.content.pm.PackageManager
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import android.graphics.Color
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import android.graphics.Rect
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import android.hardware.SensorManager
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import android.media.AudioManager
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import android.media.MediaActionSound
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import android.provider.MediaStore
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import android.util.DisplayMetrics
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import android.util.Log
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import android.view.*
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import android.widget.FrameLayout
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@ -25,19 +25,20 @@ import androidx.camera.lifecycle.ProcessCameraProvider
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import androidx.camera.view.PreviewView
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import androidx.core.app.ActivityCompat
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import androidx.core.content.ContextCompat
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import androidx.lifecycle.Lifecycle
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import androidx.lifecycle.LifecycleObserver
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import androidx.lifecycle.OnLifecycleEvent
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import com.facebook.react.bridge.Arguments
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import com.facebook.react.bridge.Promise
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import com.facebook.react.bridge.WritableMap
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import com.facebook.react.common.ReactConstants.TAG
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import com.facebook.react.uimanager.ThemedReactContext
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import com.facebook.react.uimanager.events.RCTEventEmitter
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import com.rncamerakit.barcode.BarcodeFrame
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import java.io.File
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import java.util.*
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import java.util.concurrent.ExecutorService
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import java.util.concurrent.Executors
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import kotlin.math.abs
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import kotlin.math.max
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import kotlin.math.min
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@SuppressLint("ViewConstructor") // Extra constructors unused. Not using visual layout tools
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class CKCamera(context: ThemedReactContext) : FrameLayout(context), LifecycleObserver {
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@ -46,8 +47,7 @@ class CKCamera(context: ThemedReactContext) : FrameLayout(context), LifecycleObs
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private var camera: Camera? = null
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private var preview: Preview? = null
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private var imageCapture: ImageCapture? = null
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private var qrCodeAnalyzer: ImageAnalysis? = null
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private var cameraSelector = CameraSelector.DEFAULT_BACK_CAMERA
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private var imageAnalyzer: ImageAnalysis? = null
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private var orientationListener: OrientationEventListener? = null
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private var viewFinder: PreviewView = PreviewView(context)
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private var barcodeFrame: BarcodeFrame? = null
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@ -56,7 +56,6 @@ class CKCamera(context: ThemedReactContext) : FrameLayout(context), LifecycleObs
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private var outputPath: String? = null
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private var shutterAnimationDuration: Int = 50
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private var effectLayer = View(context)
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private var counter = 0
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// Camera Props
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private var lensType = CameraSelector.LENS_FACING_BACK
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@ -65,8 +64,6 @@ class CKCamera(context: ThemedReactContext) : FrameLayout(context), LifecycleObs
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// Barcode Props
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private var scanBarcode: Boolean = false
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private var showFrame = false
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private var frameRect: Rect? = null
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private var frameColor = Color.GREEN
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private var laserColor = Color.RED
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@ -85,38 +82,18 @@ class CKCamera(context: ThemedReactContext) : FrameLayout(context), LifecycleObs
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effectLayer.alpha = 0F
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effectLayer.setBackgroundColor(Color.BLACK)
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addView(effectLayer)
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}
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override fun onAttachedToWindow() {
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super.onAttachedToWindow()
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if (hasPermissions()) {
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viewFinder.post { startCamera() }
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viewFinder.post { setupCamera() }
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}
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(getActivity() as AppCompatActivity).lifecycle.addObserver(this)
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}
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@OnLifecycleEvent(Lifecycle.Event.ON_RESUME)
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fun onResume() {
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Log.d(TAG, "onResume")
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viewFinder.post { startCamera() }
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}
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@OnLifecycleEvent(Lifecycle.Event.ON_PAUSE)
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fun onPause() {
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Log.d(TAG, "onPause")
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stopCamera()
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}
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@OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
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fun onDestroy() {
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Log.d(TAG, "onDestroy")
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stopCamera()
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}
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override fun onDetachedFromWindow() {
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super.onDetachedFromWindow()
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stopCamera()
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}
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private fun stopCamera() {
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cameraExecutor.shutdown()
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orientationListener?.disable()
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cameraProvider?.unbindAll()
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@ -141,33 +118,13 @@ class CKCamera(context: ThemedReactContext) : FrameLayout(context), LifecycleObs
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}
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}
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/** Initialize CameraX, and prepare to bind the camera use cases */
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@SuppressLint("ClickableViewAccessibility")
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private fun startCamera() {
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private fun setupCamera() {
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val cameraProviderFuture = ProcessCameraProvider.getInstance(getActivity())
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val onScaleGestureListener = object: ScaleGestureDetector.SimpleOnScaleGestureListener() {
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override fun onScale(detector: ScaleGestureDetector?): Boolean {
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if (zoomMode == "off") return true
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val cameraControl = camera?.cameraControl ?: return true
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val zoom = camera?.cameraInfo?.zoomState?.value?.zoomRatio ?: return true
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val scaleFactor = detector?.scaleFactor ?: return true
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val scale = zoom * scaleFactor
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cameraControl.setZoomRatio(scale)
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return true
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}
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}
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cameraProviderFuture.addListener(Runnable {
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// Used to bind the lifecycle of cameras to the lifecycle owner
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cameraProvider = cameraProviderFuture.get()
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val scaleDetector = ScaleGestureDetector(context, onScaleGestureListener)
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cameraSelector = CameraSelector.Builder().requireLensFacing(lensType).build()
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preview = Preview.Builder().build().also {
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it.setSurfaceProvider(viewFinder.surfaceProvider)
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}
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imageCapture = ImageCapture.Builder().build()
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// Rotate the image according to device orientation, even when UI orientation is locked
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orientationListener = object : OrientationEventListener(context, SensorManager.SENSOR_DELAY_UI) {
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@ -191,6 +148,18 @@ class CKCamera(context: ThemedReactContext) : FrameLayout(context), LifecycleObs
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}
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orientationListener!!.enable()
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val scaleDetector = ScaleGestureDetector(context, object: ScaleGestureDetector.SimpleOnScaleGestureListener() {
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override fun onScale(detector: ScaleGestureDetector?): Boolean {
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if (zoomMode == "off") return true
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val cameraControl = camera?.cameraControl ?: return true
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val zoom = camera?.cameraInfo?.zoomState?.value?.zoomRatio ?: return true
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val scaleFactor = detector?.scaleFactor ?: return true
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val scale = zoom * scaleFactor
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cameraControl.setZoomRatio(scale)
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return true
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}
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})
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// Tap to focus
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viewFinder.setOnTouchListener { _, event ->
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if (event.action != MotionEvent.ACTION_UP) {
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@ -200,40 +169,98 @@ class CKCamera(context: ThemedReactContext) : FrameLayout(context), LifecycleObs
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return@setOnTouchListener true
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}
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qrCodeAnalyzer = ImageAnalysis.Builder()
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.setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST)
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.build()
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val useCases = mutableListOf(preview, imageCapture)
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if (scanBarcode) {
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val analyzer = QRCodeAnalyzer { barcodes ->
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if (barcodes.isNotEmpty()) {
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onBarcodeRead(barcodes)
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}
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}
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qrCodeAnalyzer!!.setAnalyzer(cameraExecutor, analyzer)
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useCases.add(qrCodeAnalyzer!!)
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}
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try {
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// Unbind use cases before rebinding
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cameraProvider!!.unbindAll()
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// Bind use cases to camera
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camera = cameraProvider!!.bindToLifecycle(
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getActivity() as AppCompatActivity,
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cameraSelector,
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*useCases.toTypedArray()
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)
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preview!!.setSurfaceProvider(viewFinder.surfaceProvider)
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Log.d(TAG, "CameraView: Use cases bound")
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} catch (exc: Exception) {
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Log.e(TAG, "CameraView: Use cases binding failed", exc)
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}
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bindCameraUseCases()
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}, ContextCompat.getMainExecutor(getActivity()))
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}
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private fun bindCameraUseCases() {
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if (viewFinder.display == null) return
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// Get screen metrics used to setup camera for full screen resolution
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val metrics = DisplayMetrics().also { viewFinder.display.getRealMetrics(it) }
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Log.d(TAG, "Screen metrics: ${metrics.widthPixels} x ${metrics.heightPixels}")
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val screenAspectRatio = aspectRatio(metrics.widthPixels, metrics.heightPixels)
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Log.d(TAG, "Preview aspect ratio: $screenAspectRatio")
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val rotation = viewFinder.display.rotation
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// CameraProvider
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val cameraProvider = cameraProvider
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?: throw IllegalStateException("Camera initialization failed.")
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// CameraSelector
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val cameraSelector = CameraSelector.Builder().requireLensFacing(lensType).build()
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// Preview
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preview = Preview.Builder()
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// We request aspect ratio but no resolution
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.setTargetAspectRatio(screenAspectRatio)
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// Set initial target rotation
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.setTargetRotation(rotation)
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.build()
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// ImageCapture
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imageCapture = ImageCapture.Builder()
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.setCaptureMode(ImageCapture.CAPTURE_MODE_MINIMIZE_LATENCY)
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// We request aspect ratio but no resolution to match preview config, but letting
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// CameraX optimize for whatever specific resolution best fits our use cases
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.setTargetAspectRatio(screenAspectRatio)
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// Set initial target rotation, we will have to call this again if rotation changes
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// during the lifecycle of this use case
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.setTargetRotation(rotation)
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.build()
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// ImageAnalysis
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imageAnalyzer = ImageAnalysis.Builder()
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.setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST)
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.build()
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val useCases = mutableListOf(preview, imageCapture)
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if (scanBarcode) {
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val analyzer = QRCodeAnalyzer { barcodes ->
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if (barcodes.isNotEmpty()) {
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onBarcodeRead(barcodes)
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}
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}
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imageAnalyzer!!.setAnalyzer(cameraExecutor, analyzer)
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useCases.add(imageAnalyzer)
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}
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// Must unbind the use-cases before rebinding them
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cameraProvider.unbindAll()
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try {
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// A variable number of use-cases can be passed here -
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// camera provides access to CameraControl & CameraInfo
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camera = cameraProvider.bindToLifecycle(getActivity() as AppCompatActivity, cameraSelector, *useCases.toTypedArray())
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// Attach the viewfinder's surface provider to preview use case
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preview?.setSurfaceProvider(viewFinder.surfaceProvider)
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} catch (exc: Exception) {
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Log.e(TAG, "Use case binding failed", exc)
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}
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}
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/**
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* [androidx.camera.core.ImageAnalysisConfig] requires enum value of
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* [androidx.camera.core.AspectRatio]. Currently it has values of 4:3 & 16:9.
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*
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* Detecting the most suitable ratio for dimensions provided in @params by counting absolute
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* of preview ratio to one of the provided values.
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*
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* @param width - preview width
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* @param height - preview height
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* @return suitable aspect ratio
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*/
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private fun aspectRatio(width: Int, height: Int): Int {
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val previewRatio = max(width, height).toDouble() / min(width, height)
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if (abs(previewRatio - RATIO_4_3_VALUE) <= abs(previewRatio - RATIO_16_9_VALUE)) {
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return AspectRatio.RATIO_4_3
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}
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return AspectRatio.RATIO_16_9
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}
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private fun flashViewFinder() {
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if (shutterAnimationDuration == 0) return
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@ -299,7 +326,6 @@ class CKCamera(context: ThemedReactContext) : FrameLayout(context), LifecycleObs
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imageInfo.putString("uri", savedUri)
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imageInfo.putString("id", output.savedUri?.path)
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imageInfo.putString("name", output.savedUri?.lastPathSegment)
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// imageInfo.putInt("size", null)
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imageInfo.putInt("width", width)
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imageInfo.putInt("height", height)
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imageInfo.putString("path", output.savedUri?.path)
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@ -419,7 +445,7 @@ class CKCamera(context: ThemedReactContext) : FrameLayout(context), LifecycleObs
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fun setScanBarcode(enabled: Boolean) {
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val restartCamera = enabled != scanBarcode
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scanBarcode = enabled
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if (restartCamera) startCamera()
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if (restartCamera) bindCameraUseCases()
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}
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fun setCameraType(type: String = "back") {
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@ -429,7 +455,7 @@ class CKCamera(context: ThemedReactContext) : FrameLayout(context), LifecycleObs
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}
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val restartCamera = lensType != newLensType
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lensType = newLensType
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if (restartCamera) startCamera()
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if (restartCamera) bindCameraUseCases()
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}
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fun setOutputPath(path: String) {
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@ -485,4 +511,11 @@ class CKCamera(context: ThemedReactContext) : FrameLayout(context), LifecycleObs
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)
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return false
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}
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companion object {
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private const val TAG = "CameraKit"
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private const val RATIO_4_3_VALUE = 4.0 / 3.0
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private const val RATIO_16_9_VALUE = 16.0 / 9.0
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}
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}
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