Camera1 and Camera2 difference

Disclaimer: This article is a blogger original article, reproduced welcome but must indicate the source Thank you! https://blog.csdn.net/dongxianfei/article/details/91445918

content	Camera1.0	Camera2.0
Competence	android.permission.CAMERA	android.permission.CAMERA
layout	SurfaceView	TextureView
Implement an interface	SurfaceHolder.Callback 1.surfaceCreated 2.surfaceChanged 3.surfaceDestroyed	SurfaceTextureListener 1.onSurfaceTextureAvailable 2.onSurfaceTextureSizeChanged 3.onSurfaceTextureDestroyed 4.onSurfaceTextureUpdated
Camera parameters (settings, view)	Camera.Parameters Camera.Size	See: CameraCharacteristics in getCameraCharacteristics (CameraID) provided: CaptureRequest.Builder the void set (Key key, T value) Example: Exposure: CaptureReqBuilder.set (CaptureRequest.CONTROL_AE_EXPOSURE_COMPENSATION, 2);
Open the camera	surfaceCreated中Camera.open(CameraID)	onSurfaceTextureAvailable中CameraManager.openCamera(CameraId,CameraDevice.StateCallback,Handler)
Start preview	Camera.startPreview()	CaptureReqBuilder = camera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);CaptureReqBuilder.addTarget(Surface);Camera.createCaptureSession(Arrays.asList(surface),CaptureSessionStateCallback, Handler);
Set Preview direction	Camera.setDisplayOrientation(degrees)	And there is no direct way to set the preview direction, but TextureView itself is a View, support rotation, translation, scaling, and then rewrite method onMeasure
The original image data byte [] real-time access	Camera.PreviewCallback中onPreviewFrame(byte[],Camera)	1. onSurfaceTextureUpdated used TextureView of getBitmap () method, but to get here is the Bitmap object, but what I need is the raw byte [], so this method is not applicable. 2. Set ImageReader.setOnImageAvailableListener monitoring, method to get an Image object in onImageAvailable (ImageReader) passed through ImageReader.acquireLatestImage callback () (do not forget to close (), otherwise the screen will be stuck, stop refreshing), and then Image.getPlanes () [0] .getBuffer () returns a ByteBuffer objects, the new byte [buffer.remaining ()] to obtain the original image byte []. Do not forget to CaptureReqBuilder.addTarget (ImageReader.getSurface ()); otherwise do not see results
Camera image preview size setting	Camera.Parameters.setPreviewSize(width, height)	TextureView. GetSurfaceTexture () to get SurfaceTexture () object through the setDefaultBufferSize (width, height) is set.
In the future to get a picture size settings	Camera.Parameters.setPictureSize(width, height);	ImageReader.newInstance(width, height,ImageFormat.YUV_420_888, MAX_IMAGES);
Formatting the future to get a picture of	Camera.Parameters..setPictureFormat(ImageFormat.JPEG);	ImageReader.newInstance(width, height,ImageFormat.YUV_420_888, MAX_IMAGES);

1. Camera2 camera device object is to manage to get through the system CameraManager service, a preview of the camera, the camera is to request a session (CaptureSession.StateCallback, when the camera was turned on by the output surface of the device's camera) sends a request (CaptureRequest.Builder). It needs to be processed in the callback onConfigured, such as preview, if you write CameraCaptureSession.setRepeatingRequest (mCaptureReqBuilder.build (), null, mHandler) is not in this method; the preview will not be successful.

2. In addition, the session is created, set ImageReader listen, we need to pass a Handler object, the Handler object determines these sessions, the callback method listeners will be called in which thread, if passed is NULL, then the callback will be called in the current thread .

Flash lights control mode

Camera1:
This code can be a camera flash mode supported
List supportedFlashModes = params.getSupportedFlashModes ();
a method for controlling the flash:
params.setFlashMode (Parameters.FLASH_MODE_TORCH); // open flash

Parameters.FLASH_MODE_TORCH: flash normally open
Parameters.FLASH_MODE_ON: open only when the camera flash

Camera2:
This code can be used to detect whether the currently open camera with flash
boolean flashAvailable = cameraCharacteristics.get (CameraCharacteristics.FLASH_INFO_AVAILABLE);
a method for controlling the flash:

case 0:
    mBtnFlash.setImageResource(R.drawable.btn_flash_off);
    mPreviewBuilder.set(CaptureRequest.CONTROL_AE_MODE, CameraMetadata.CONTROL_AE_MODE_ON);
    mPreviewBuilder.set(CaptureRequest.FLASH_MODE, CameraMetadata.FLASH_MODE_OFF);
    break;
case 1:
    mBtnFlash.setImageResource(R.drawable.btn_flash_on);
    mPreviewBuilder.set(CaptureRequest.CONTROL_AE_MODE, CameraMetadata.CONTROL_AE_MODE_ON);
    mPreviewBuilder.set(CaptureRequest.FLASH_MODE, CameraMetadata.FLASH_MODE_SINGLE);
    break;
case 2:
    mBtnFlash.setImageResource(R.drawable.btn_flash_all_on);
    mPreviewBuilder.set(CaptureRequest.CONTROL_AE_MODE, CameraMetadata.CONTROL_AE_MODE_ON);
    mPreviewBuilder.set(CaptureRequest.FLASH_MODE, CameraMetadata.FLASH_MODE_TORCH);
    break;