从零开发一款相机APP 第八篇: Camera2相机 拍照功能实现

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final CaptureRequest.Builder captureBuilder =
        mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);

captureBuilder.addTarget(mImageReader.getSurface());

captureBuilder.set(CaptureRequest.CONTROL_AF_MODE,
               CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);

captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, getOrientation(rotation));

mImageReader = ImageReader.newInstance(largest.getWidth(), largest.getHeight(),
                        ImageFormat.JPEG, /*maxImages*/2);
						
mImageReader.setOnImageAvailableListener(
		mOnImageAvailableListener, mBackgroundHandler);

 CameraCaptureSession.CaptureCallback CaptureCallback
                    = new CameraCaptureSession.CaptureCallback() {

                @Override
                public void onCaptureCompleted(@NonNull CameraCaptureSession session,
                                               @NonNull CaptureRequest request,
                                               @NonNull TotalCaptureResult result) {

                    unlockFocus();
                }
};

mPreviewCaptureSession.stopRepeating();
mPreviewCaptureSession.abortCaptures();
mPreviewCaptureSession.capture(captureBuilder.build(), CaptureCallback, null);

private final ImageReader.OnImageAvailableListener mOnImageAvailableListener
            = new ImageReader.OnImageAvailableListener() {
        @Override
        public void onImageAvailable(ImageReader reader) {
            mBackgroundHandler.post(new ImageSaver(reader.acquireLatestImage(), mFile));
        }
};