Java GraphicOverlay未按预期绘制边界框
我正在使用CameraX（来自GitHub的QuickStart CameraX Basic）和firebase ML工具包进行实时人脸检测。除了边界框不是绘制在面上，而是远离面之外，其他一切都可以正常工作。 我正在使用ML工具包quickStart GraphicOverlay.Class和FaceGraphic.Class graphicsoverlay.javaJava GraphicOverlay未按预期绘制边界框,java,android,firebase-mlkit,android-camerax,Java,Android,Firebase Mlkit,Android Camerax,我正在使用CameraX（来自GitHub的QuickStart CameraX Basic）和firebase ML工具包进行实时人脸检测。除了边界框不是绘制在面上，而是远离面之外，其他一切都可以正常工作。 我正在使用ML工具包quickStart GraphicOverlay.Class和FaceGraphic.Class graphicsoverlay.java public class GraphicOverlay extends View { private final Object
public class GraphicOverlay extends View {
private final Object mLock = new Object();
private int mPreviewWidth;
private float mWidthScaleFactor = 1.5f;
private int mPreviewHeight;
private float mHeightScaleFactor = 1.5f;
private int mFacing = CameraSource.CAMERA_FACING_BACK;
private Set<Graphic> mGraphics = new HashSet<>();
public GraphicOverlay(Context context, AttributeSet attrs) {
super(context, attrs);
}
public void clear() {
synchronized (mLock) {
mGraphics.clear();
}
postInvalidate();
}
public void add(Graphic graphic) {
synchronized (mLock) {
mGraphics.add(graphic);
}
postInvalidate();
}
public void remove(Graphic graphic) {
synchronized (mLock) {
mGraphics.remove(graphic);
}
postInvalidate();
}
public void setCameraInfo(int previewWidth, int previewHeight, int facing) {
synchronized (mLock) {
mPreviewWidth = previewWidth;
mPreviewHeight = previewHeight;
mFacing = facing;
}
postInvalidate();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
synchronized (mLock) {
if ((mPreviewWidth != 0) && (mPreviewHeight != 0)) {
mWidthScaleFactor = (float) getWidth() / (float) mPreviewWidth;
mHeightScaleFactor = (float)getHeight() / (float) mPreviewHeight;
}
for (Graphic graphic : mGraphics) {
graphic.draw(canvas);
}
}
}
public static abstract class Graphic {
private GraphicOverlay mOverlay;
public Graphic(GraphicOverlay overlay) {
mOverlay = overlay;
}
public abstract void draw(Canvas canvas);
public float scaleX(float horizontal) {
return horizontal * mOverlay.mWidthScaleFactor;
}
public float scaleY(float vertical) {
return vertical * mOverlay.mHeightScaleFactor;
}
public float translateX(float x) {
if (mOverlay.mFacing == CameraSource.CAMERA_FACING_FRONT) {
return mOverlay.getWidth() - scaleX(x);
} else {
return scaleX(x);
}
}
public float translateY(float y) {
return scaleY(y);
}
public void postInvalidate() {
mOverlay.postInvalidate();
}
}
}
public class FaceGraphic extends GraphicOverlay.Graphic {
private static final float FACE_POSITION_RADIUS = 10.0f;
private static final float ID_TEXT_SIZE = 40.0f;
private static final float ID_Y_OFFSET = 50.0f;
private static final float ID_X_OFFSET = -50.0f;
private static final float BOX_STROKE_WIDTH = 5.0f;
private static final int[] COLOR_CHOICES = {
Color.BLUE //, Color.CYAN, Color.GREEN, Color.MAGENTA, Color.RED, Color.WHITE, Color.YELLOW
};
private static int currentColorIndex = 0;
private final Paint facePositionPaint;
private final Paint idPaint, centerPoint;
private final Paint boxPaint, screenCenterPaint;
private final Paint movePaint;
GraphicOverlay graphicOverlay;
private int facing;
private volatile FirebaseVisionFace firebaseVisionFace;
public FaceGraphic(GraphicOverlay overlay) {
super(overlay);
this.graphicOverlay = overlay;
currentColorIndex = (currentColorIndex + 1) % COLOR_CHOICES.length;
final int selectedColor = COLOR_CHOICES[currentColorIndex];
screenCenterPaint = new Paint();
screenCenterPaint.setColor(Color.GREEN);
facePositionPaint = new Paint();
facePositionPaint.setColor(selectedColor);
idPaint = new Paint();
idPaint.setColor(Color.WHITE);
idPaint.setTextSize(ID_TEXT_SIZE);
boxPaint = new Paint();
boxPaint.setColor(Color.WHITE);
boxPaint.setStyle(Paint.Style.STROKE);
boxPaint.setStrokeWidth(BOX_STROKE_WIDTH);
centerPoint = new Paint();
centerPoint.setStrokeWidth(5f);
centerPoint.setColor(Color.RED);
centerPoint.setStyle(Paint.Style.STROKE);
movePaint = new Paint();
movePaint.setColor(Color.RED);
movePaint.setTextSize(38);
}
public void updateFace(FirebaseVisionFace face, int facing) {
firebaseVisionFace = face;
this.facing = facing;
postInvalidate();
}
@Override
public void draw(Canvas canvas) {
canvas.drawCircle(canvas.getWidth() / 2, canvas.getHeight() / 2, 10, screenCenterPaint);
FirebaseVisionFace face = firebaseVisionFace;
if (face == null) {
return;
}
// Draws a circle at the position of the detected face, with the face's track id below.
float x = translateX(face.getBoundingBox().centerX());
float y = translateY(face.getBoundingBox().centerY());
canvas.drawCircle(x, y, FACE_POSITION_RADIUS, facePositionPaint);
Log.d("myFaceBounds", String.valueOf(face.getBoundingBox()));
float faceRightOrLeftAngle = face.getHeadEulerAngleY();
float faceTiltAngle = face.getHeadEulerAngleZ();
// Draws a bounding box around the face.
float xOffset = scaleX(face.getBoundingBox().width() / 2.0f);
float yOffset = scaleY(face.getBoundingBox().height() / 2.0f);
float left = x - xOffset - 100;
float top = y - yOffset - 100;
float right = x + xOffset + 100;
float bottom = y + yOffset + 100;
canvas.drawRect(left, top, right, bottom, boxPaint);
}
}
class CameraFragment : Fragment() {
private lateinit var container: FrameLayout
private lateinit var viewFinder: TextureView
private lateinit var outputDirectory: File
private lateinit var broadcastManager: LocalBroadcastManager
private var displayId = -1
private var lensFacing = CameraX.LensFacing.BACK
private var preview: Preview? = null
private var imageCapture: ImageCapture? = null
private var imageAnalyzer: ImageAnalysis? = null
private lateinit var graphicOverlay: GraphicOverlay
private val volumeDownReceiver = object : BroadcastReceiver() {
override fun onReceive(context: Context, intent: Intent) {
val keyCode = intent.getIntExtra(KEY_EVENT_EXTRA, KeyEvent.KEYCODE_UNKNOWN)
when (keyCode) {
// When the volume down button is pressed, simulate a shutter button click
KeyEvent.KEYCODE_VOLUME_DOWN -> {
val shutter = container
.findViewById<ImageButton>(R.id.camera_capture_button)
shutter.simulateClick()
}
}
}
}
private val analyzerThread = HandlerThread("LuminosityAnalysis").apply { start() }
private lateinit var displayManager: DisplayManager
private val displayListener = object : DisplayManager.DisplayListener {
override fun onDisplayAdded(displayId: Int) = Unit
override fun onDisplayRemoved(displayId: Int) = Unit
override fun onDisplayChanged(displayId: Int) = view?.let { view ->
if (displayId == this@CameraFragment.displayId) {
Log.d(TAG, "Rotation changed: ${view.display.rotation}")
preview?.setTargetRotation(view.display.rotation)
imageCapture?.setTargetRotation(view.display.rotation)
imageAnalyzer?.setTargetRotation(view.display.rotation)
}
} ?: Unit
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
retainInstance = true
}
override fun onResume() {
super.onResume()
if (!PermissionsFragment.hasPermissions(requireContext())) {
Navigation.findNavController(requireActivity(), R.id.fragment_container).navigate(
CameraFragmentDirections.actionCameraToPermissions())
}
}
override fun onDestroyView() {
super.onDestroyView()
broadcastManager.unregisterReceiver(volumeDownReceiver)
displayManager.unregisterDisplayListener(displayListener)
}
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?): View? =
inflater.inflate(R.layout.fragment_camera, container, false)
private fun setGalleryThumbnail(file: File) {
val thumbnail = container.findViewById<ImageButton>(R.id.photo_view_button)
thumbnail.post {
thumbnail.setPadding(resources.getDimension(R.dimen.stroke_small).toInt())
Glide.with(thumbnail)
.load(file)
.apply(RequestOptions.circleCropTransform())
.into(thumbnail)
}
}
private val imageSavedListener = object : ImageCapture.OnImageSavedListener {
override fun onError(
error: ImageCapture.UseCaseError, message: String, exc: Throwable?) {
Log.e(TAG, "Photo capture failed: $message")
exc?.printStackTrace()
}
override fun onImageSaved(photoFile: File) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
setGalleryThumbnail(photoFile)
}
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {
requireActivity().sendBroadcast(
Intent(Camera.ACTION_NEW_PICTURE, Uri.fromFile(photoFile)))
}
val mimeType = MimeTypeMap.getSingleton()
.getMimeTypeFromExtension(photoFile.extension)
MediaScannerConnection.scanFile(
context, arrayOf(photoFile.absolutePath), arrayOf(mimeType), null)
}
}
/*---------------------------------------------------------------------------------------------------------------------------------------------*/
@SuppressLint("MissingPermission")
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
container = view as FrameLayout
viewFinder = container.findViewById(R.id.view_finder)
graphicOverlay = container.findViewById(R.id.graphicOverlay)
broadcastManager = LocalBroadcastManager.getInstance(view.context)
val filter = IntentFilter().apply { addAction(KEY_EVENT_ACTION) }
broadcastManager.registerReceiver(volumeDownReceiver, filter)
displayManager = viewFinder.context
.getSystemService(Context.DISPLAY_SERVICE) as DisplayManager
displayManager.registerDisplayListener(displayListener, null)
outputDirectory = MainActivity.getOutputDirectory(requireContext())
viewFinder.post {
displayId = viewFinder.display.displayId
updateCameraUi()
bindCameraUseCases()
lifecycleScope.launch(Dispatchers.IO) {
outputDirectory.listFiles { file ->
EXTENSION_WHITELIST.contains(file.extension.toUpperCase())
}.sorted().reversed().firstOrNull()?.let { setGalleryThumbnail(it) }
}
}
}
private fun bindCameraUseCases() {
val metrics = DisplayMetrics().also { viewFinder.display.getRealMetrics(it) }
val screenAspectRatio = Rational(metrics.widthPixels, metrics.heightPixels)
Log.d(TAG, "Screen metrics: ${metrics.widthPixels} x ${metrics.heightPixels}")
val viewFinderConfig = PreviewConfig.Builder().apply {
setLensFacing(lensFacing)
setTargetAspectRatio(screenAspectRatio)
setTargetRotation(viewFinder.display.rotation)
}.build()
preview = AutoFitPreviewBuilder.build(viewFinderConfig, viewFinder)
graphicOverlay.setCameraInfo(metrics.widthPixels, metrics.heightPixels, getLensFacing())
val imageCaptureConfig = ImageCaptureConfig.Builder().apply {
setLensFacing(lensFacing)
setCaptureMode(CaptureMode.MIN_LATENCY)
setTargetAspectRatio(screenAspectRatio)
setTargetRotation(viewFinder.display.rotation)
}.build()
imageCapture = ImageCapture(imageCaptureConfig)
// Setup image analysis pipeline that computes average pixel luminance in real time
val analyzerConfig = ImageAnalysisConfig.Builder().apply {
setLensFacing(lensFacing)
setCallbackHandler(Handler(analyzerThread.looper))
setImageReaderMode(ImageAnalysis.ImageReaderMode.ACQUIRE_LATEST_IMAGE)
setTargetRotation(viewFinder.display.rotation)
}.build()
imageAnalyzer = ImageAnalysis(analyzerConfig).apply {
analyzer = LuminosityAnalyzer(graphicOverlay)
}
CameraX.bindToLifecycle(
viewLifecycleOwner, preview, imageCapture, imageAnalyzer)
}
@SuppressLint("RestrictedApi")
private fun updateCameraUi() {
container.findViewById<ConstraintLayout>(R.id.camera_ui_container)?.let {
container.removeView(it)
}
val controls = View.inflate(requireContext(), R.layout.camera_ui_container, container)
controls.findViewById<ImageButton>(R.id.camera_capture_button).setOnClickListener {
imageCapture?.let { imageCapture ->
val photoFile = createFile(outputDirectory, FILENAME, PHOTO_EXTENSION)
val metadata = Metadata().apply {
isReversedHorizontal = lensFacing == CameraX.LensFacing.FRONT
}
imageCapture.takePicture(photoFile, imageSavedListener, metadata)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
container.postDelayed({
container.foreground = ColorDrawable(Color.WHITE)
container.postDelayed(
{ container.foreground = null }, ANIMATION_FAST_MILLIS)
}, ANIMATION_SLOW_MILLIS)
}
}
}
controls.findViewById<ImageButton>(R.id.camera_switch_button).setOnClickListener {
lensFacing = if (CameraX.LensFacing.FRONT == lensFacing) {
CameraX.LensFacing.BACK
} else {
CameraX.LensFacing.FRONT
}
try {
CameraX.getCameraWithLensFacing(lensFacing)
CameraX.unbindAll()
bindCameraUseCases()
} catch (exc: Exception) {
}
}
controls.findViewById<ImageButton>(R.id.photo_view_button).setOnClickListener {
Navigation.findNavController(requireActivity(), R.id.fragment_container).navigate(
CameraFragmentDirections.actionCameraToGallery(outputDirectory.absolutePath))
}
}
private class LuminosityAnalyzer(graphicOverlay: GraphicOverlay) : ImageAnalysis.Analyzer {
val graphicOverlay = graphicOverlay
private var lastAnalyzedTimestamp = 0L
private fun getRotation(rotationCompensation: Int): Int {
val result: Int
when (rotationCompensation) {
0 -> result = FirebaseVisionImageMetadata.ROTATION_0
90 -> result = FirebaseVisionImageMetadata.ROTATION_90
180 -> result = FirebaseVisionImageMetadata.ROTATION_180
270 -> result = FirebaseVisionImageMetadata.ROTATION_270
else -> {
result = FirebaseVisionImageMetadata.ROTATION_0
}
}
return result
}
override fun analyze(image: ImageProxy, rotationDegrees: Int) {
val currentTimestamp = System.currentTimeMillis()
if (currentTimestamp - lastAnalyzedTimestamp >= TimeUnit.MILLISECONDS.toMillis(300)) {
lastAnalyzedTimestamp = currentTimestamp
try {
val y = image.planes[0]
val u = image.planes[1]
val v = image.planes[2]
//Then we can then get the number of pixels in each plane
val Yb = y.buffer.remaining()
val Ub = u.buffer.remaining()
val Vb = v.buffer.remaining()
//and convert them into a single YUV formatted ByteArray
val data = ByteArray(Yb + Ub + Vb)
y.buffer.get(data, 0, Yb)
u.buffer.get(data, Yb, Ub)
v.buffer.get(data, Yb + Ub, Vb)
val metadata = FirebaseVisionImageMetadata.Builder()
.setFormat(FirebaseVisionImageMetadata.IMAGE_FORMAT_YV12)
.setHeight(image.height)
.setWidth(image.width)
.setRotation(getRotation(rotationDegrees))
.build()
val options = FirebaseVisionFaceDetectorOptions.Builder()
.setPerformanceMode(FirebaseVisionFaceDetectorOptions.FAST)
.setLandmarkMode(FirebaseVisionFaceDetectorOptions.ALL_LANDMARKS)
.enableTracking()
.build()
val labelImage = FirebaseVisionImage.fromByteArray(data, metadata)
val detector = FirebaseVision.getInstance().getVisionFaceDetector(options)
detector.detectInImage(labelImage)
.addOnSuccessListener { faces ->
graphicOverlay.clear()
for (face in faces) {
val faceGraphic = FaceGraphic(graphicOverlay)
graphicOverlay.add(faceGraphic)
faceGraphic.updateFace(face, 1)
}
}
.addOnFailureListener { }
} catch (e: IllegalStateException) {
}
}
}
}
companion object {
private const val TAG = "CameraXBasic"
private const val FILENAME = "yyyy-MM-dd-HH-mm-ss-SSS"
private const val PHOTO_EXTENSION = ".jpg"
private fun createFile(baseFolder: File, format: String, extension: String) =
File(baseFolder, SimpleDateFormat(format, Locale.US)
.format(System.currentTimeMillis()) + extension)
}
private fun getLensFacing(): Int {
return if (lensFacing == CameraX.LensFacing.BACK) {
0
} else
1
}
}
class AutoFitPreviewBuilder private constructor(
config: PreviewConfig, viewFinderRef: WeakReference<TextureView>) {
/** Public instance of preview use-case which can be used by consumers of this adapter */
val useCase: Preview
/** Internal variable used to keep track of the use case's output rotation */
private var bufferRotation: Int = 0
/** Internal variable used to keep track of the view's rotation */
private var viewFinderRotation: Int? = null
/** Internal variable used to keep track of the use-case's output dimension */
private var bufferDimens: Size = Size(0, 0)
/** Internal variable used to keep track of the view's dimension */
private var viewFinderDimens: Size = Size(0, 0)
/** Internal variable used to keep track of the view's display */
private var viewFinderDisplay: Int = -1
/** Internal reference of the [DisplayManager] */
private lateinit var displayManager: DisplayManager
/**
* We need a display listener for orientation changes that do not trigger a configuration
* change, for example if we choose to override config change in manifest or for 180-degree
* orientation changes.
*/
private val displayListener = object : DisplayManager.DisplayListener {
override fun onDisplayAdded(displayId: Int) = Unit
override fun onDisplayRemoved(displayId: Int) = Unit
override fun onDisplayChanged(displayId: Int) {
val viewFinder = viewFinderRef.get() ?: return
if (displayId == viewFinderDisplay) {
val display = displayManager.getDisplay(displayId)
val rotation = getDisplaySurfaceRotation(display)
updateTransform(viewFinder, rotation, bufferDimens, viewFinderDimens)
}
}
}
init {
// Make sure that the view finder reference is valid
val viewFinder = viewFinderRef.get() ?:
throw IllegalArgumentException("Invalid reference to view finder used")
// Initialize the display and rotation from texture view information
viewFinderDisplay = viewFinder.display.displayId
viewFinderRotation = getDisplaySurfaceRotation(viewFinder.display) ?: 0
// Initialize public use-case with the given config
useCase = Preview(config)
// Every time the view finder is updated, recompute layout
useCase.onPreviewOutputUpdateListener = Preview.OnPreviewOutputUpdateListener {
val viewFinder =
viewFinderRef.get() ?: return@OnPreviewOutputUpdateListener
Log.d(TAG, "Preview output changed. " +
"Size: ${it.textureSize}. Rotation: ${it.rotationDegrees}")
// To update the SurfaceTexture, we have to remove it and re-add it
val parent = viewFinder.parent as ViewGroup
parent.removeView(viewFinder)
parent.addView(viewFinder, 0)
// Update internal texture
viewFinder.surfaceTexture = it.surfaceTexture
// Apply relevant transformations
bufferRotation = it.rotationDegrees
val rotation = getDisplaySurfaceRotation(viewFinder.display)
updateTransform(viewFinder, rotation, it.textureSize, viewFinderDimens)
}
// Every time the provided texture view changes, recompute layout
viewFinder.addOnLayoutChangeListener { view, left, top, right, bottom, _, _, _, _ ->
val viewFinder = view as TextureView
val newViewFinderDimens = Size(right - left, bottom - top)
Log.d(TAG, "View finder layout changed. Size: $newViewFinderDimens")
val rotation = getDisplaySurfaceRotation(viewFinder.display)
updateTransform(viewFinder, rotation, bufferDimens, newViewFinderDimens)
}
// Every time the orientation of device changes, recompute layout
// NOTE: This is unnecessary if we listen to display orientation changes in the camera
// fragment and call [Preview.setTargetRotation()] (like we do in this sample), which will
// trigger [Preview.OnPreviewOutputUpdateListener] with a new
// [PreviewOutput.rotationDegrees]. CameraX Preview use case will not rotate the frames for
// us, it will just tell us about the buffer rotation with respect to sensor orientation.
// In this sample, we ignore the buffer rotation and instead look at the view finder's
// rotation every time [updateTransform] is called, which gets triggered by
// [CameraFragment] display listener -- but the approach taken in this sample is not the
// only valid one.
displayManager = viewFinder.context
.getSystemService(Context.DISPLAY_SERVICE) as DisplayManager
displayManager.registerDisplayListener(displayListener, null)
// Remove the display listeners when the view is detached to avoid holding a reference to
// it outside of the Fragment that owns the view.
// NOTE: Even though using a weak reference should take care of this, we still try to avoid
// unnecessary calls to the listener this way.
viewFinder.addOnAttachStateChangeListener(object : View.OnAttachStateChangeListener {
override fun onViewAttachedToWindow(view: View?) =
displayManager.registerDisplayListener(displayListener, null)
override fun onViewDetachedFromWindow(view: View?) =
displayManager.unregisterDisplayListener(displayListener)
})
}
/** Helper function that fits a camera preview into the given [TextureView] */
private fun updateTransform(textureView: TextureView?, rotation: Int?, newBufferDimens: Size,
newViewFinderDimens: Size) {
// This should not happen anyway, but now the linter knows
val textureView = textureView ?: return
if (rotation == viewFinderRotation &&
Objects.equals(newBufferDimens, bufferDimens) &&
Objects.equals(newViewFinderDimens, viewFinderDimens)) {
// Nothing has changed, no need to transform output again
return
}
if (rotation == null) {
// Invalid rotation - wait for valid inputs before setting matrix
return
} else {
// Update internal field with new inputs
viewFinderRotation = rotation
}
if (newBufferDimens.width == 0 || newBufferDimens.height == 0) {
// Invalid buffer dimens - wait for valid inputs before setting matrix
return
} else {
// Update internal field with new inputs
bufferDimens = newBufferDimens
}
if (newViewFinderDimens.width == 0 || newViewFinderDimens.height == 0) {
// Invalid view finder dimens - wait for valid inputs before setting matrix
return
} else {
// Update internal field with new inputs
viewFinderDimens = newViewFinderDimens
}
val matrix = Matrix()
Log.d(TAG, "Applying output transformation.\n" +
"View finder size: $viewFinderDimens.\n" +
"Preview output size: $bufferDimens\n" +
"View finder rotation: $viewFinderRotation\n" +
"Preview output rotation: $bufferRotation")
// Compute the center of the view finder
val centerX = viewFinderDimens.width / 2f
val centerY = viewFinderDimens.height / 2f
// Correct preview output to account for display rotation
matrix.postRotate(-viewFinderRotation!!.toFloat(), centerX, centerY)
// Buffers are rotated relative to the device's 'natural' orientation: swap width and height
val bufferRatio = bufferDimens.height / bufferDimens.width.toFloat()
val scaledWidth: Int
val scaledHeight: Int
// Match longest sides together -- i.e. apply center-crop transformation
if (viewFinderDimens.width > viewFinderDimens.height) {
scaledHeight = viewFinderDimens.width
scaledWidth = Math.round(viewFinderDimens.width * bufferRatio)
} else {
scaledHeight = viewFinderDimens.height
scaledWidth = Math.round(viewFinderDimens.height * bufferRatio)
}
// Compute the relative scale value
val xScale = scaledWidth / viewFinderDimens.width.toFloat()
val yScale = scaledHeight / viewFinderDimens.height.toFloat()
// Scale input buffers to fill the view finder
matrix.preScale(xScale, yScale, centerX, centerY)
// Finally, apply transformations to our TextureView
textureView.setTransform(matrix)
}
companion object {
private val TAG = AutoFitPreviewBuilder::class.java.simpleName
/** Helper function that gets the rotation of a [Display] in degrees */
fun getDisplaySurfaceRotation(display: Display?) = when(display?.rotation) {
Surface.ROTATION_0 -> 0
Surface.ROTATION_90 -> 90
Surface.ROTATION_180 -> 180
Surface.ROTATION_270 -> 270
else -> null
}
/**
* Main entrypoint for users of this class: instantiates the adapter and returns an instance
* of [Preview] which automatically adjusts in size and rotation to compensate for
* config changes.
*/
fun build(config: PreviewConfig, viewFinder: TextureView) =
AutoFitPreviewBuilder(config, WeakReference(viewFinder)).useCase
}
}
类CameraFragment:Fragment（）{
私有lateinit变量容器：FrameLayout
私有lateinit var取景器：TextureView
私有lateinit var输出目录：文件
私有lateinit var broadcastManager:LocalBroadcastManager
私有变量displayId=-1
私有变量lensFacing=CameraX.lensFacing.BACK
私有变量预览：预览？=null
私有变量imageCapture:imageCapture？=null
专用var imageAnalyzer:ImageAnalysis？=null
私有lateinit var graphicOverlay:graphicOverlay
private val volumeDownReceiver=对象：BroadcastReceiver（）{
覆盖接收（上下文：上下文，意图：意图）{
val keyCode=intent.getIntExtra（KEY\u EVENT\u EXTRA，KeyEvent.keyCode\u未知）
何时（键码）{
//按下音量降低按钮时，模拟快门按钮的单击
KeyEvent.KEYCODE\u音量\u下降->{
val快门=容器
.findViewById（R.id.摄像头捕捉按钮）
shutter.simulateClick（）命令
}
}
}
}
私有val analyzerThread=HandlerThread（“发光分析”）。应用{start（）}
私有lateinit变量displayManager:displayManager
私有val displayListener=对象：DisplayManager.displayListener{
覆盖已添加的显示（显示ID:Int）=单位
覆盖显示已删除（显示ID:Int）=单位
覆盖显示更改（displayId:Int）=视图？.let{view->
如果（displayId==this@CameraFragment.displayId) {
d（标记“旋转已更改：${view.display.Rotation}”）
预览？.setTargetRotation（查看、显示、旋转）
imageCapture？.setTargetRotation（查看、显示、旋转）
图像分析仪？设置目标（视图、显示、旋转）
}
}？：单位
}
重写创建时的乐趣（savedInstanceState:Bundle？）{
super.onCreate（savedInstanceState）
保持值=真
}
重写onResume（）{
super.onResume（）
如果（！PermissionsFragment.hasPermissions（requireContext（）））{
findNavController（requireActivity（），R.id.fragment_容器）。导航(
CameraFragmentDirections.actionCameraToPermissions（））
}
}
重写onDestroyView（）{
super.onDestroyView（）
broadcastManager.UnregistereReceiver（volumeDownReceiver）
displayManager.unregisterDisplayListener（displayListener）
}
覆盖创建视图(
充气机，
容器：视图组？，
savedInstanceState:捆绑？：查看=
充气机。充气（右布局图。摄像机、容器、假）
private fun setGalleryThumbnail（文件：file）{
val缩略图=container.findViewById（R.id.photo\u view\u按钮）
邮件{
thumbnail.setPadding（resources.getdimen（R.dimen.stroke_small）.toInt（））
使用（缩略图）滑动
.load（文件）
.apply（RequestOptions.circleCropTransform（））
.插入（缩略图）
}
}
private val imageSavedListener=对象：ImageCapture.OnImageSavedListener{
忽略错误(
错误：ImageCapture.UseCaseError，消息：字符串，exc:Throwable？）{
Log.e（标记“照片捕获失败：$message”）
exc？.printStackTrace（）
}
覆盖已保存的图像（照片文件：文件）{
if（Build.VERSION.SDK\u INT>=Build.VERSION\u code.M）{
setGalleryThumbnail（照片文件）
}
if（Build.VERSION.SDK_INT
扩展名\白名单.contains（文件扩展名.toUpperCase（））
}.sorted（）.reversed（）.firstOrNull（）？.let{setGalleryThumbnail（it）}
}
}
}
私人娱乐杂志{
val metrics=DisplayMetrics（）。也是{viewFinder.display.getRealMetrics（it）}
val screenspectratio=Rational（metrics.widthPixels，metrics.heightPixels）
Log.d（标记，“屏幕度量：${metrics.widthPixels}x${metrics.heightPixels}”）
val viewFinderConfig=PreviewConfig.Builder（）.apply{
设置透镜面（透镜面）
SetTargetSpectratio（屏幕显示）
塞塔