我使用

https://github.com/googlesamples/android-Camera2Basic,但尝试修改它,我可以访问每个帧,然后在surfaceview上绘制.

我明白了,我应该添加额外的表面(ImageReader.getSurface()),并在此回调中从中读取帧：

private final ImageReader.OnImageAvailableListener mOnImageAvailableListener

= new ImageReader.OnImageAvailableListener() {

@Override

public void onImageAvailable(ImageReader reader) {

Log.d("Img", "onImageAvailable");

mBackgroundHandler.post(new ImageSaver(reader.acquireNextImage(), mFile));

}

};

问题是只有当用户捕获图像而不是从摄像机发送到预览屏幕的eacg帧时,才会调用此回调.

这是我试图添加的内容：

private void createCameraPreviewSession() {

try {

SurfaceTexture texture = mTextureView.getSurfaceTexture();

assert texture != null;

// We configure the size of default buffer to be the size of camera preview we want.

texture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());

// This is the output Surface we need to start preview.

Surface surface = new Surface(texture);

// We set up a CaptureRequest.Builder with the output Surface.

mPreviewRequestBuilder

= mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);

mPreviewRequestBuilder.addTarget(surface);

// Here, we create a CameraCaptureSession for camera preview.

mCameraDevice.createCaptureSession(Arrays.asList(surface, mImageReader.getSurface()),

new CameraCaptureSession.StateCallback() {

@Override

public void onConfigured(CameraCaptureSession cameraCaptureSession) {

// The camera is already closed

if (null == mCameraDevice) {

return;

}

// When the session is ready, we start displaying the preview.

mCaptureSession = cameraCaptureSession;

try {

// Auto focus should be continuous for camera preview.

mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE,

CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);

// Flash is automatically enabled when necessary.

mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE,

CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH);

// Finally, we start displaying the camera preview.

mPreviewRequest = mPreviewRequestBuilder.build();

mCaptureSession.setRepeatingRequest(mPreviewRequest,

mCaptureCallback, mBackgroundHandler);

//mPreviewRequestBuilder.addTarget(mImageReader.getSurface());

} catch (CameraAccessException e) {

e.printStackTrace();

}

}

@Override

public void onConfigureFailed(CameraCaptureSession cameraCaptureSession) {

showToast("Failed");

}

}, null

);

/**TODO added for capturing aeach frame*/

// This is the CaptureRequest.Builder that we use to take a picture.

final CaptureRequest.Builder captureBuilder =

mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);

captureBuilder.addTarget(mImageReader.getSurface());

// Use the same AE and AF modes as the preview.

captureBuilder.set(CaptureRequest.CONTROL_AF_MODE,

CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);

captureBuilder.set(CaptureRequest.CONTROL_AE_MODE,

CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH);

/**end added for capture each frame*/

} catch (CameraAccessException e) {

e.printStackTrace();

}

}