void BindScan(ProcessCameraProvider cameraProvider, int width, int height)
{
var preview = new Preview.Builder().Build();
// 绑定预览
preview.SetSurfaceProvider(binding !.previewView.SurfaceProvider);
// 使用后置相机
var cameraSelector = new CameraSelector.Builder()
.RequireLensFacing(CameraSelector.LensFacingBack)
.Build();
// 绑定图片扫描解析
var imageAnalysis = new ImageAnalysis.Builder()
.SetTargetResolution(new(width, height))
.SetBackpressureStrategy(ImageAnalysis.StrategyKeepOnlyLatest)
.Build();
// 绑定图片扫描解析
analyser = new((barCodes, imageWidth, imageHeight) =>
{
// 解绑当前所有相机操作
cameraProvider.UnbindAll();
ScanCompletedHandler?.Invoke(barCodes.Select(x => x.GetRawBytes()));
ScanCompletedHandler = null;
Finish();
});
imageAnalysis.SetAnalyzer(Executors.NewSingleThreadExecutor(), analyser);
camera = cameraProvider.BindToLifecycle(this, cameraSelector, imageAnalysis, preview);
}
/// <summary>
/// https://codelabs.developers.google.com/codelabs/camerax-getting-started#3
/// </summary>
private void StartCamera()
{
var cameraProviderFuture = ProcessCameraProvider.GetInstance(this);
cameraProviderFuture.AddListener(new Runnable(() =>
{
// Used to bind the lifecycle of cameras to the lifecycle owner
var cameraProvider = (ProcessCameraProvider)cameraProviderFuture.Get();
// Preview
var preview = new Preview.Builder().Build();
preview.SetSurfaceProvider(viewFinder.CreateSurfaceProvider());
// Take Photo
this.imageCapture = new ImageCapture.Builder().Build();
// Frame by frame analyze
var imageAnalyzer = new ImageAnalysis.Builder().Build();
imageAnalyzer.SetAnalyzer(cameraExecutor, new LuminosityAnalyzer(luma =>
Log.Debug(TAG, $"Average luminosity: {luma}")
));
// Select back camera as a default, or front camera otherwise
CameraSelector cameraSelector = null;
if (cameraProvider.HasCamera(CameraSelector.DefaultBackCamera) == true)
{
cameraSelector = CameraSelector.DefaultBackCamera;
}
else if (cameraProvider.HasCamera(CameraSelector.DefaultFrontCamera) == true)
{
cameraSelector = CameraSelector.DefaultFrontCamera;
}
else
{
throw new System.Exception("Camera not found");
}
try
{
// Unbind use cases before rebinding
cameraProvider.UnbindAll();
// Bind use cases to camera
cameraProvider.BindToLifecycle(this, cameraSelector, preview, imageCapture, imageAnalyzer);
}
catch (Exception exc)
{
Log.Debug(TAG, "Use case binding failed", exc);
Toast.MakeText(this, $"Use case binding failed: {exc.Message}", ToastLength.Short).Show();
}
}), ContextCompat.GetMainExecutor(this)); //GetMainExecutor: returns an Executor that runs on the main thread.
}
private void BindCameraUseCases()
{
var metrics = new DisplayMetrics();
_previewView.Display !.GetRealMetrics(metrics);
var rotation = GetRotation(_previewView.Display.Rotation);
var cameraSelector = new CameraSelector.Builder().RequireLensFacing(CameraSelector.LensFacingBack)
.Build();
var aspectRatio = AspectRatio(metrics.WidthPixels, metrics.HeightPixels);
_preview = new Preview.Builder()
.SetTargetRotation(rotation)
.SetTargetAspectRatio(aspectRatio)
.Build();
_imageCapture = new ImageCapture.Builder()
.SetCaptureMode(ImageCapture.CaptureModeMinimizeLatency)
.SetTargetRotation(rotation)
.SetTargetAspectRatio(aspectRatio)
.Build();
var imageAnalyzer = new ImageAnalysis.Builder()
.SetTargetRotation(rotation)
.SetTargetAspectRatio(aspectRatio)
.Build();
imageAnalyzer.SetAnalyzer(_cameraExecutor, new LuminosityAnalyzer(this));
_cameraProvider.UnbindAll();
try
{
_camera = _cameraProvider.BindToLifecycle(this, cameraSelector, _preview, _imageCapture, imageAnalyzer);
_preview.SetSurfaceProvider(_previewView.SurfaceProvider);
}
catch (Java.Lang.Exception ex)
{
Log.Error(TAG, "Use case binding failed", ex);
}
}
/// <summary>
/// 初始化并绑定摄像头
/// </summary>
/// <param name="lifecycleOwner"></param>
public void InitAndStartCamera(ILifecycleOwner lifecycleOwner, Action <bool, string> InitCallBack)
{
var cameraProviderFuture = ProcessCameraProvider.GetInstance(this.Context);
cameraExecutor = Executors.NewSingleThreadExecutor();
cameraProviderFuture.AddListener(new Java.Lang.Runnable(() =>
{
// Used to bind the lifecycle of cameras to the lifecycle owner
var cameraProvider = (ProcessCameraProvider)cameraProviderFuture.Get();
// Preview
var preview = new Preview.Builder()
.Build();
preview.SetSurfaceProvider(_CameraPreView.SurfaceProvider);
// Take Photo
this._ImageCapture = new ImageCapture.Builder()
.SetTargetResolution(new Size(CaptureImageSize_Width, CaptureImageSize_Height))
.Build();
// Frame by frame analyze(Not Use Now)
var imageAnalyzer = new ImageAnalysis.Builder().Build();
imageAnalysisFrameProcess = new ImageAnalysisFrameProcess();
imageAnalyzer.SetAnalyzer(cameraExecutor, imageAnalysisFrameProcess);
//imageAnalyzer.SetAnalyzer(cameraExecutor, new LuminosityAnalyzer(luma =>
// Log.Debug("", $"Average luminosity: {luma}")
// ));
#region Select back camera as a default, or front camera otherwise
CameraSelector cameraSelector = null;
//if (cameraProvider.HasCamera(CameraSelector.DefaultBackCamera) == true)
// cameraSelector = CameraSelector.DefaultBackCamera;
//else if (cameraProvider.HasCamera(CameraSelector.DefaultFrontCamera) == true)
// cameraSelector = CameraSelector.DefaultFrontCamera;
//else
// throw new System.Exception("Camera not found");
switch (CameraFacing)
{
case CameraFacing.Back:
if (cameraProvider.HasCamera(CameraSelector.DefaultBackCamera) == true)
{
cameraSelector = CameraSelector.DefaultBackCamera;
}
else
{
if (cameraProvider.HasCamera(CameraSelector.DefaultFrontCamera) == true)
{
cameraSelector = CameraSelector.DefaultFrontCamera;
}
else
{
InitCallBack?.Invoke(false, "Not found any camera device");
return;
}
}
break;
case CameraFacing.Front:
{
if (cameraProvider.HasCamera(CameraSelector.DefaultFrontCamera) == true)
{
cameraSelector = CameraSelector.DefaultFrontCamera;
}
else
{
if (cameraProvider.HasCamera(CameraSelector.DefaultBackCamera) == true)
{
cameraSelector = CameraSelector.DefaultBackCamera;
}
else
{
InitCallBack?.Invoke(false, "Not found any camera device");
return;
}
}
}
break;
}
#endregion
try
{
// Unbind use cases before rebinding
cameraProvider.UnbindAll();
// Bind use cases to camera
var camera = cameraProvider.BindToLifecycle(lifecycleOwner, cameraSelector, preview, _ImageCapture, imageAnalyzer);
_CameraController = camera.CameraControl;
_CameraInfo = camera.CameraInfo;
InitCallBack?.Invoke(true, "");
}
catch (Exception exc)
{
Toast.MakeText(this.Context, $"Use case binding failed: {exc.Message}", ToastLength.Short).Show();
}
}), AndroidX.Core.Content.ContextCompat.GetMainExecutor(this.Context));
}