/// <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.
}
/// <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));
}