Develop Reference

Why does the front camera not open, when using Camera2 API?

I am using Camera2 API (https://github.com/googlearchive/android-Camera2Basic) for my project.
I want to use Front and Rear both camera, It’s working properly on my device
Realme5
Android: 10
But when I am trying to use front camera on
One Plus 6, Android: 10 or Samsung Galaxy J7 Nxt, Android 7.0 Or Redmi.
Then I am going on onConfigureFailed method and it’s redirect me firstActivity
Manifest ScreenShots:enter image description here
Log ScreenShots:enter image description here
Whole code in googlearchive GitHub link is given above
Variable Initialisation
private static final SparseIntArray ORIENTATIONS = new SparseIntArray();
private static final int REQUEST_CAMERA_PERMISSION = 1;
private static final String FRAGMENT_DIALOG = "dialog";
static {
ORIENTATIONS.append(Surface.ROTATION_0, 90);
ORIENTATIONS.append(Surface.ROTATION_90, 0);
ORIENTATIONS.append(Surface.ROTATION_180, 270);
ORIENTATIONS.append(Surface.ROTATION_270, 180);
}
public static int mSelectedFacing = 1;
flip camera button click
if (mTextureView.isAvailable()) {
if(mSelectedFacing ==0){
mSelectedFacing = 1;
}else {
mSelectedFacing = 0;
}
closeCamera();
openCamera(mTextureView.getWidth(), mTextureView.getHeight(), mSelectedFacing);
} else {
mTextureView.setSurfaceTextureListener(mSurfaceTextureListener);
}
Open camera
private void openCamera(int width, int height,int mSelectedFacing) {
if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.CAMERA)
!= PackageManager.PERMISSION_GRANTED) {
requestCameraPermission();
return;
}
setUpCameraOutputs(width, height,mSelectedFacing);
configureTransform(width, height);
Activity activity = getActivity();
CameraManager manager = (CameraManager) activity.getSystemService(Context.CAMERA_SERVICE);
try {
if (!mCameraOpenCloseLock.tryAcquire(2500, TimeUnit.MILLISECONDS)) {
throw new RuntimeException("Time out waiting to lock camera opening.");
}
manager.openCamera(mCameraId, mStateCallback, mBackgroundHandler);
} catch (CameraAccessException e) {
e.printStackTrace();
} catch (InterruptedException e) {
throw new RuntimeException("Interrupted while trying to lock camera opening.", e);
}
}
Close camera
private void closeCamera() {
try {
mCameraOpenCloseLock.acquire();
if (null != mCaptureSession) {
mCaptureSession.close();
mCaptureSession = null;
}
if (null != mCameraDevice) {
mCameraDevice.close();
mCameraDevice = null;
}
if (null != mImageReader) {
mImageReader.close();
mImageReader = null;
}
} catch (InterruptedException e) {
throw new RuntimeException("Interrupted while trying to lock camera closing.", e);
} finally {
mCameraOpenCloseLock.release();
}
}
CameraPreviewSession
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(#NonNull 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.
setAutoFlash(mPreviewRequestBuilder);
// Finally, we start displaying the camera preview.
mPreviewRequest = mPreviewRequestBuilder.build();
mCaptureSession.setRepeatingRequest(mPreviewRequest,
mCaptureCallback, mBackgroundHandler);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
#Override
public void onConfigureFailed(
#NonNull CameraCaptureSession cameraCaptureSession) {
showToast("Failed");
}
}, null
);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
Please help me …
Thanks in advance

I have do like it will capture image in background without any preview screen using Camera2 API in background service.
Visit https://codepalyers.blogspot.com/2020/12/capture-image-in-background-without.html
If you wish to use rear camera use
private final String frontCamera = "1";
private final String backCamera = "0";
as already define in code.

Camera preview and Camera capture Use Camera2 API, But occur ;Request targets Surface that is not part of current capture session' message on android

I want Camera preview and Camera Capture use Camera2 API.
this code is works, but there is one problem.
problem is When click the capture button, capture succeeds, camera preview stops.
if I press the capture button again, the camera preview is still paused.
if I do not press the capture button after running the app, camera preview is success work.
Error log when the capture button is pressed.
java.lang.IllegalArgumentException: submitRequestList:208: Request targets Surface that is not part of current capture session
at android.hardware.camera2.CameraManager.throwAsPublicException(CameraManager.java:650)
at android.hardware.camera2.impl.ICameraDeviceUserWrapper.submitRequestList(ICameraDeviceUserWrapper.java:86)
at android.hardware.camera2.impl.CameraDeviceImpl.submitCaptureRequest(CameraDeviceImpl.java:935)
at android.hardware.camera2.impl.CameraDeviceImpl.setRepeatingRequest(CameraDeviceImpl.java:974)
at android.hardware.camera2.impl.CameraCaptureSessionImpl.setRepeatingRequest(CameraCaptureSessionImpl.java:243)
at com.bilal.androidthingscameralib.CameraHelper$4.onCaptureCompleted(CameraHelper.java:273)
at java.lang.reflect.Method.invoke(Native Method)
at android.hardware.camera2.dispatch.InvokeDispatcher.dispatch(InvokeDispatcher.java:39)
at android.hardware.camera2.dispatch.HandlerDispatcher$1.run(HandlerDispatcher.java:65)
at android.os.Handler.handleCallback(Handler.java:790)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: android.os.ServiceSpecificException: submitRequestList:208: Request targets Surface that is not part of current capture session (code 3)
at android.os.Parcel.readException(Parcel.java:2018)
at android.os.Parcel.readException(Parcel.java:1950)
at android.hardware.camera2.ICameraDeviceUser$Stub$Proxy.submitRequestList(ICameraDeviceUser.java:334)
at android.hardware.camera2.impl.ICameraDeviceUserWrapper.submitRequestList(ICameraDeviceUserWrapper.java:84)
at android.hardware.camera2.impl.CameraDeviceImpl.submitCaptureRequest(CameraDeviceImpl.java:935) 
at android.hardware.camera2.impl.CameraDeviceImpl.setRepeatingRequest(CameraDeviceImpl.java:974) 
at android.hardware.camera2.impl.CameraCaptureSessionImpl.setRepeatingRequest(CameraCaptureSessionImpl.java:243) 
at com.bilal.androidthingscameralib.CameraHelper$4.onCaptureCompleted(CameraHelper.java:273) 
at java.lang.reflect.Method.invoke(Native Method) 
at android.hardware.camera2.dispatch.InvokeDispatcher.dispatch(InvokeDispatcher.java:39) 
at android.hardware.camera2.dispatch.HandlerDispatcher$1.run(HandlerDispatcher.java:65) 
at android.os.Handler.handleCallback(Handler.java:790) 
at android.os.Handler.dispatchMessage(Handler.java:99) 
at android.os.Looper.loop(Looper.java:164) 
at android.app.ActivityThread.main(ActivityThread.java:6494) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807) 
and my source (MainActivity.class);
private InitializeCamera mInitializeCamera;
TextureView mTextureView;
ImageView imgCaptureImage;
#Override
public void onCreate(Bundle savedInstanceState) {
Button capBtn = (Button) findViewById(R.id.capBtn); //capture button
#Override
public void onClick(View v) {
mInitializeCamera.captureImage();
}
}
//camera open texture
private final TextureView.SurfaceTextureListener mSurfaceTextureListener
= new TextureView.SurfaceTextureListener() {
#Override
public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
mInitializeCamera = new InitializeCamera(getApplicationContext(), mOnPictureAvailableListener, mTextureView, 640, 480, 1);
}
...
};
//picture taken
private OnPictureAvailableListener mOnPictureAvailableListener =
new OnPictureAvailableListener() {
#Override
public void onPictureAvailable(byte[] imageBytes) {
onPictureTaken(imageBytes);
}
};
//get picture
private void onPictureTaken(final byte[] imageBytes) {
if (imageBytes != null) {
Bitmap bitmap = BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.length);
imgCaptureImage.setImageBitmap(bitmap);
}
}
(InitializeCamera.class) :)
OnPictureAvailableListener mOnPictureAvailableListener;
private HandlerThread mCameraHandlerThread;
//Initialize camera library class
private CameraHelper mCameraHelper;
//Handler for running Camera Task in the background
private Handler mCameraHandler = new Handler();
public InitializeCamera(Context mContext, OnPictureAvailableListener mOnPictureAvailableListener, TextureView textureView, int imageHeight, int imageWidth, int maxSize) {
this.mOnPictureAvailableListener = mOnPictureAvailableListener;
//create new handler thread for camera operations.
mCameraHandlerThread = new HandlerThread("CameraBackground");
mCameraHandlerThread.start();
//Initialize Camera class.
mCameraHelper = CameraHelper.getInstance();
mCameraHelper.initializeCameraHelper(mContext, mCameraHandler, textureView, this, imageHeight, imageWidth, maxSize);
}
//capture image
public void captureImage() {
mCameraHelper.takePicture();
}
//get imagereader available
#Override
public void onImageAvailable(ImageReader reader) {
Image image = reader.acquireNextImage();
ByteBuffer imageBuf = image.getPlanes()[0].getBuffer();
final byte[] imageBytes = new byte[imageBuf.remaining()];
image.close();
//post image bytes data to main UI Thread for displaying it in image view
mCameraHandler.post(new Runnable() {
#Override
public void run()( {
mOnPictureAvailableListener.onPictureAvailable(imageBytes);
}
});
}
(CameraHelper.class) (thanks)
TextureView textureView;
private CameraDevice mCameraDevice;
private CameraCaptureSession mCaptureSession;
private ImageReader mImageReader;
Size imageDimension;
private CaptureRequest.Builder captureRequestBuilder;
//Lazy-loaded singleton, so only one instance of the camera is created.
private CameraHelper() {
}
private static class InstanceHolder {
private static CameraHelper mCamera = new CameraHelper();
}
public static CameraHelper getInstance() {
return InstanceHolder.mCamera;
}
//Initialize the camera device.
public void initializeCameraHelper(Context context, Handler backgroundHandler, TextureView textureView, ImageReader.OnImageAvailableListener imageAvailableListener, int imageWidth, int imageHeight, int maxImages) {
this.textureView = textureView;
//discover the camera instance
CameraManager manager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
String[] camIds = {};
try {
camIds = manager.getCameraIdList();
if (camIds.length < 1) {
return;
}
String id = camIds[0];
CameraCharacteristics characteristics = manager.getCameraCharacteristics(id);
StreamConfigurationMap map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
imageDimension = map.getOutputSizes(SurfaceTexture.class)[2];
//Initialize the image processor
mImageReader = ImageReader.newInstance(imageWidth, imageHeight, ImageFormat.JPEG, maxImages);
mImageReader.setOnImageAvailableListener(
imageAvailableListener, backgroundHandler);
//Open camera resource
manager.openCamera(id, mStateCallback, backgroundHandler);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
/**
* Callback handling device state changes
*/
private final CameraDevice.StateCallback mStateCallback = new CameraDevice.StateCallback() {
#Override
public void onOpened(#NonNull CameraDevice cameraDevice) {
Log.d(TAG, "Opened camera.");
mCameraDevice = cameraDevice;
createCameraPreview();
}
#Override
public void onDisconnected(#NonNull CameraDevice cameraDevice) {
Log.d(TAG, "Camera disconnected, closing.");
closeCaptureSession();
cameraDevice.close();
}
#Override
public void onError(#NonNull CameraDevice cameraDevice, int i) {
Log.d(TAG, "Camera device error, closing.");
closeCaptureSession();
cameraDevice.close();
}
#Override
public void onClosed(#NonNull CameraDevice cameraDevice) {
Log.d(TAG, "Closed camera, releasing");
mCameraDevice = null;
}
};
private void createCameraPreview() {
Log.d(TAG, "createCameraPreview --" + textureView);
try {
SurfaceTexture texture = textureView.getSurfaceTexture();
texture.setDefaultBufferSize(imageDimension.getWidth(), imageDimension.getHeight());
Surface surface = new Surface(texture);
captureRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
captureRequestBuilder.addTarget(surface);
mCameraDevice.createCaptureSession(Arrays.asList(surface), new CameraCaptureSession.StateCallback() {
#Override
public void onConfigured(#NonNull CameraCaptureSession session) {
if (mCameraDevice == null) {
return;
}
mCaptureSession = session;
updatePreview();
}
#Override
public void onConfigureFailed(#NonNull CameraCaptureSession session) {
}
}, null);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
//ready preview screen
private void updatePreview() {
if (mCameraDevice == null) {
}
captureRequestBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
try {
mCaptureSession.setRepeatingRequest(captureRequestBuilder.build(), null, null);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
/**
* Begin a still image capture
*/
public void takePicture() {
if (mCameraDevice == null) {
Log.w(TAG, "Cannot capture image. Camera not initialized.");
return;
}
// Here, we create a CameraCaptureSession for capturing still images.
try {
mCameraDevice.createCaptureSession(
Collections.singletonList(mImageReader.getSurface()),
mSessionCallback,
null);
} catch (CameraAccessException cae) {
Log.d(TAG, "access exception while preparing pic", cae);
}
}
/**
* Callback handling session state changes
*/
private CameraCaptureSession.StateCallback mSessionCallback =
new CameraCaptureSession.StateCallback() {
#Override
public void onConfigured(#NonNull CameraCaptureSession cameraCaptureSession) {
// The camera is already closed
if (mCameraDevice == null) {
return;
}
// When the session is ready, we start capture.
mCaptureSession = cameraCaptureSession;
triggerImageCapture();
}
#Override
public void onConfigureFailed(#NonNull CameraCaptureSession cameraCaptureSession) {
Log.w(TAG, "Failed to configure camera");
}
};
/**
* Execute a new capture request within the active session
*/
private void triggerImageCapture() {
try {
final CaptureRequest.Builder captureBuilder =
mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
captureBuilder.addTarget(mImageReader.getSurface());
captureBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON);
Log.d(TAG, "Capture request created.");
mCaptureSession.capture(captureBuilder.build(), mCaptureCallback, null);
} catch (CameraAccessException cae) {
Log.d(TAG, "camera capture exception");
}
}
/**
* Callback handling capture session events
*/
private final CameraCaptureSession.CaptureCallback mCaptureCallback =
new CameraCaptureSession.CaptureCallback() {
#Override
public void onCaptureProgressed(#NonNull CameraCaptureSession session,
#NonNull CaptureRequest request,
#NonNull CaptureResult partialResult) {
Log.d(TAG, "Partial result");
}
#Override
public void onCaptureCompleted(#NonNull CameraCaptureSession session,
#NonNull CaptureRequest request,
#NonNull TotalCaptureResult result) {
//session.close();
//mCaptureSession = null;
captureRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER, CameraMetadata.CONTROL_AF_TRIGGER_CANCEL);
try {
mCaptureSession.setRepeatingRequest(captureRequestBuilder.build(), mCaptureCallback, null); //OCCUR ERROR LOG
} catch (CameraAccessException e) {
e.printStackTrace();
}
Log.d(TAG, "CaptureSession closed");
}
};
Occur error log CameraHelper.class
Request targets Surface that is not part of current capture session
private final CameraCaptureSession.CaptureCallback mCaptureCallback =
new CameraCaptureSession.CaptureCallback() {
#Override
public void onCaptureCompleted(#NonNull CameraCaptureSession session,
#NonNull CaptureRequest request,
#NonNull TotalCaptureResult result) {
//session.close();
//mCaptureSession = null;
captureRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER, CameraMetadata.CONTROL_AF_TRIGGER_CANCEL);
try {
mCaptureSession.setRepeatingRequest(captureRequestBuilder.build(), mCaptureCallback, null);
} catch (CameraAccessException e) {
e.printStackTrace();
}
Log.d(TAG, "CaptureSession closed");
}
};
this part
I think after capture, there seems to be a problem with mCaptureCallback
How to fix this problem?
if you know please advice for me..
thanks.

You're creating a new capture session in takePicture with just the one ImageReader Surface; after that, you can no longer use the TextureView Surface as a capture request target. You have to create yet another session to resume preview.
It's better to just add the JPEG ImageReader Surface to the initial capture session, and not have to be continually tearing down sessions to take pictures (which is quite slow). For regular preview, don't target the ImageReader in the repeating request, and then for still capture, just issue a capture request that targets the ImageReader.
See the camera2basic sample for examples of this.

Record feed from camera2 device and send it over a network

I am developing an application which is supposed to capture the camera preview/video from camera2 api and send the ByteArray to another device connected over a network(preferrably wifi). But I couldn't get the proper preview similar to that of PreviewCallBack in the deprecated api. I know that the code won't be of much help but still I am adding it. Please guide me through any solution. Any links will also be appreciated. Thanks..
private void createPreview() throws CameraAccessException {
SurfaceTexture surfaceTexture = mTexture.getSurfaceTexture();
assert surfaceTexture != null;
surfaceTexture.setDefaultBufferSize(size.getWidth(), size.getHeight());
//Surface surface = new Surface(surfaceTexture);
ImageReader imageReader = ImageReader.newInstance(size.getWidth(), size.getHeight(), ImageFormat.JPEG, 2);
imageReader.setOnImageAvailableListener(reader -> {
Image image = reader.acquireLatestImage();
ByteBuffer byteBuffer = image.getPlanes()[0].getBuffer();
image.close();
}, null);
captureRequestBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
captureRequestBuilder.addTarget(imageReader.getSurface());
cameraDevice.createCaptureSession(Arrays.asList(imageReader.getSurface()), new CameraCaptureSession.StateCallback() {
#Override
public void onConfigured(#NonNull CameraCaptureSession session) {
cameraCaptureSession = session;
updatePreview();
}
#Override
public void onConfigureFailed(#NonNull CameraCaptureSession session) {
}
}, null);
}

Pictures with Camera2 API are really dark

I'm working on Android and I'm trying to capture a picture without displaying any preview. I tried to simplify the process by making a class. It's working but all the pictures are really really dark.
Here is my class :
public class Cam {
private Context context;
private CameraManager manager;
private CameraDevice camera;
private CameraCaptureSession session;
private ImageReader reader;
public static String FRONT="-1";
public static String BACK="-1";
private boolean available=true;
private String filepath;
private static final String NO_CAM = "No camera found on device!";
private static final String ERR_CONFIGURE = "Failed configuring session";
private static final String ERR_OPEN = "Can't open the camera";
private static final String CAM_DISCONNECT = "Camera disconnected";
private static final String FILE_EXIST = "File already exist";
private static final SparseIntArray ORIENTATIONS = new SparseIntArray();
static {
ORIENTATIONS.append(Surface.ROTATION_0, 90);
ORIENTATIONS.append(Surface.ROTATION_90, 0);
ORIENTATIONS.append(Surface.ROTATION_180, 270);
ORIENTATIONS.append(Surface.ROTATION_270, 180);
}
public Cam(Context context) throws CameraAccessException {
this.context = context;
this.manager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
String ids[] = manager.getCameraIdList();
if(ids.length==2){
BACK=ids[0];
FRONT=ids[1];
}
else if(ids.length==1){
BACK=ids[0];
}
else{
available=false;
throw new CameraAccessException(-1, NO_CAM);
}
}
public void takePicture(String camId, String filepath) throws CameraAccessException {
if(available){
this.filepath=filepath;
StreamConfigurationMap map = manager.getCameraCharacteristics(camId).get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
Size largest = Collections.max(Arrays.asList(map.getOutputSizes(ImageFormat.JPEG)), new CompareSizesByArea());
reader=ImageReader.newInstance(largest.getWidth(), largest.getHeight(), ImageFormat.JPEG, 1);
reader.setOnImageAvailableListener(imageListener, null);
manager.openCamera(camId, cameraStateCallback, null);
}
else
throwError(NO_CAM);
}
private CameraDevice.StateCallback cameraStateCallback = new CameraDevice.StateCallback() {
#Override
public void onOpened(CameraDevice camera) {
Cam.this.camera=camera;
try {
camera.createCaptureSession(Collections.singletonList(reader.getSurface()), sessionStateCallback, null);
} catch (CameraAccessException e) {
throwError(e.getMessage());
}
}
#Override
public void onDisconnected(CameraDevice camera) {
throwError(CAM_DISCONNECT);
}
#Override
public void onError(CameraDevice camera, int error) {
throwError(ERR_OPEN);
}
};
private CameraCaptureSession.StateCallback sessionStateCallback = new CameraCaptureSession.StateCallback() {
#Override
public void onConfigured(CameraCaptureSession session) {
Cam.this.session=session;
try {
CaptureRequest.Builder request = camera.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
request.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
request.addTarget(reader.getSurface());
int rotation = ((WindowManager)context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getRotation();
request.set(CaptureRequest.JPEG_ORIENTATION, ORIENTATIONS.get(rotation));
session.capture(request.build(), captureCallback, null);
} catch (CameraAccessException e) {
throwError(e.getMessage());
}
}
#Override
public void onConfigureFailed(CameraCaptureSession session) {
throwError(ERR_CONFIGURE);
}
};
private CameraCaptureSession.CaptureCallback captureCallback = new CameraCaptureSession.CaptureCallback() {
#Override
public void onCaptureFailed(CameraCaptureSession session, CaptureRequest request, CaptureFailure failure) {
super.onCaptureFailed(session, request, failure);
throwError(failure.toString());
}
};
private ImageReader.OnImageAvailableListener imageListener = new ImageReader.OnImageAvailableListener() {
#Override
public void onImageAvailable(ImageReader reader) {
Image image = reader.acquireLatestImage();
try {
File file = saveImage(image);
// Send file via a listener
closeCamera();
} catch (IOException e) {
throwError(e.getMessage());
}
reader.close();
}
};
private File saveImage(Image image) throws IOException {
File file = new File(filepath);
if (file.exists()) {
throwError(FILE_EXIST);
return null;
}
else {
ByteBuffer buffer = image.getPlanes()[0].getBuffer();
byte[] bytes = new byte[buffer.remaining()];
buffer.get(bytes);
FileOutputStream output = new FileOutputStream(file);
output.write(bytes);
image.close();
output.close();
return file;
}
}
static class CompareSizesByArea implements Comparator<Size> {
#Override
public int compare(Size lhs, Size rhs) {
return Long.signum((long) lhs.getWidth() * lhs.getHeight() - (long) rhs.getWidth() * rhs.getHeight());
}
}
private void closeCamera(){
if(session!=null) {session.close();}
if(reader!=null) {reader.close();}
if(camera!=null) {camera.close();}
}
Then I call the Cam object in my Activity :
Cam cam = new Cam(MainActivity.this);
cam.takePicture(Cam.BACK, "/sdcard/pic.jpg");
A listener prevent the MainActivity when the picture is available, but I removed the code to clear a bit.
I don't know what I am doing wrong, the pictures are really dark. Maybe a flag or something... Any help will be appreciated.
EDIT:
Working class : https://github.com/omaflak/Android-Camera2-Library/blob/master/ezcam/src/main/java/me/aflak/ezcam/EZCam.java
Example: https://github.com/omaflak/Android-Camera2-Library/blob/master/app/src/main/java/me/aflak/libraries/MainActivity.java

If the only capture request you send to the camera is the one for the final picture, this is not surprising.
The camera automatic exposure, focus, and white balance routines generally need a second or two of streaming buffers before they converge to good results.
While you don't need to draw preview on screen, the simplest method here is to first run a repeating request targeting a dummy SurfaceTexture for a second or two, and then fire off the JPEG capture.
You could just stream the JPEG capture, but JPEG capture is slow, so you'll need a longer time for convergence (plus it's more likely a camera implementation has a bug with repeated JPEG capture and getting good exposure, than with a typical preview).
So, create a dummy SurfaceTexture with a random texture ID argument:
private SurfaceTexture mDummyPreview = new SurfaceTexture(1);
private Surface mDummySurface = new Surface(mDummyPreview);
and include the Surface in your session configuration. Once the session is configured, create a preview request that targets the dummy preview, and after N capture results have come in, submit the capture request for the JPEG you want. You'll want to experiment with N, but probably ~30 frames is enough.
Note that you're still not dealing with:
Locking AF to ensure a sharp image for your JPEG
Running AE precapture to allow for flash metering, if you want to allow for flash use
Having some way for the user to know what they'll be capturing, since there's no preview, they can't aim the device at anything very well.
The AF lock and precapture trigger sequences are included in Camera2Basic sample here: https://github.com/googlesamples/android-Camera2Basic, so you can take a look at what those do.

Maybe you can try to turn on the automatic exposure mode and automatic white balance:
request.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON);
request.set(CaptureRequest.CONTROL_AWB_MODE, CaptureRequest.CONTROL_AWB_MODE_AUTO);
I hope it will help :)

In my case just configuration FPS helps me. And don't forget to put it to CaptureRequest.Builder for preview and ALSO to CaptureRequest.Builder capture builder. As usual FPS 10 or 15 frames quite enough for photo and preview.
Capture builder
// This is the CaptureRequest.Builder that we use to take a picture.
final CaptureRequest.Builder captureBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
...
setupFPS(captureBuilder);
Preview builder:
// We set up a CaptureRequest.Builder with the output Surface.
mPreviewRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
mPreviewRequestBuilder.addTarget(surface);
...
// set FPS rate
setupFPS(mPreviewRequestBuilder);
Where setupFPS:
private void setupFPS(CaptureRequest.Builder builder){
if(fpsRange != null) {
builder.set(CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE, fpsRange);
}
}
And initialization of FPS with:
CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraId);
try {
Range<Integer>[] ranges = characteristics.get(CameraCharacteristics.CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES);
if(ranges != null) {
for (Range<Integer> range : ranges) {
int upper = range.getUpper();
Log.i(TAG, "[FPS Range Available]:" + range);
if (upper >= 10) {
if (fpsRange == null || upper < fpsRange.getUpper()) {
fpsRange = range;
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
Log.i(TAG, "[FPS Range] is:" + fpsRange);

I was facing a dark image issue for the last two days and now I have a solution for it.
You need to set CaptureRequest like below.
I tried to set the brightness in camera2 API.
final CaptureRequest.Builder captureBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
captureBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON);
captureBuilder.set(CaptureRequest.CONTROL_AE_LOCK, true);
captureBuilder.set(CaptureRequest.CONTROL_AE_EXPOSURE_COMPENSATION, 10);
captureBuilder.addTarget(imageReader.getSurface());

I know this is old, but I ran into a similar issue. Sharing what worked for me for anyone else who stumbles upon this. Tried all sorts of answers here with no success.
Setting CONTROL_AE_MODE to CONTROL_AE_MODE_ON (as some suggested) also did not fix it (you think it would).
What fixed it for me was setting the CONTROL_CAPTURE_INTENT to CONTROL_CAPTURE_INTENT_VIDEO_RECORD.
request.set(CaptureRequest.CONTROL_CAPTURE_INTENT, CaptureRequest.CONTROL_CAPTURE_INTENT_VIDEO_RECORD);
Once adding this line and building, auto exposure was enabled on the camera as expected and the camera adjusted automatically.
Refer to https://developer.android.com/reference/android/hardware/camera2/CameraMetadata for more information. I used this as a guide to discover what options were available.

android camera2 process each frame and display its preview

I use the https://github.com/googlesamples/android-Camera2Basic, but try to modify it in a way that I could get access to each frame before it is drawn on the surfaceview.
I understood, I should add additional surface (ImageReader.getSurface()), and read the frame from it in this callback:
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));
}
};
The problem is this callback gets called only when the image is capture by the user and not on eacg frame that is sent to preview screen from camera.
Here is what I tried to add:
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();
}
}

Instead of creating a new instance of CaptureRequest.Builder, just add the ImageReader's Surface to the mPreviewRequestBuilder's output target.