android: camera is not taking a picture

android: camera is not taking a picture - android

The idea is simple: My App should create a camera object, show a preview and take a picture (without pressing any button) and close the camera afterwards. Unfortunately it is not even taking any pictures. (Means: My callback code which should be executed after the picture is taken is never reached.)
I'm using a little wrapper class for the android camera api. My activity code looks like this:
camera = new SurveillanceCamera(this, layoutForPreview);
camera.start();
camera.takePicture();
The wrapper class:
public SurveillanceCamera(Context context, LinearLayout previewLayout) {
cameraInstance = Camera.open(findBackFacingCamera());
pictureCallback = getPictureCallback();
cameraPreview = new CameraPreview(context, cameraInstance);
this.previewLayout = previewLayout;
this.previewLayout.addView(cameraPreview);
cameraInstance.startPreview();
}
public void takePicture() {
//this code is reached
cameraInstance.takePicture(null, null, pictureCallback);
}
public void start() {
if (cameraInstance == null) {
cameraInstance = Camera.open(findBackFacingCamera());
pictureCallback = getPictureCallback();
cameraPreview.setCamera(cameraInstance);
cameraInstance.startPreview();
}
}
private PictureCallback getPictureCallback() {
PictureCallback picture = new PictureCallback() {
#Override
public void onPictureTaken(byte[] data, Camera camera) {
Log.e(TAG, "Jey picture was taken...");
// refresh camera to continue preview
cameraPreview.refreshCamera(cameraInstance);
}
};
return picture;
}
private int findBackFacingCamera() {
int cameraId = -1;
// Search for the back facing camera
// get the number of cameras
int numberOfCameras = Camera.getNumberOfCameras();
// for every camera check
for (int i = 0; i < numberOfCameras; i++) {
CameraInfo info = new CameraInfo();
Camera.getCameraInfo(i, info);
if (info.facing == CameraInfo.CAMERA_FACING_BACK) {
cameraId = i;
break;
}
}
return cameraId;
}
There are no exceptions thrown in the code, but the Log.e() in onPictureTaken is not shown. It seems that the camera preview is displayed but nothing happens. Is it possible, that the preview is not fully loaded at the moment when camera.takePicture() is executed? Any suggestions?

Your suspicion is most likely justified. I don't see when setPreviewDisplay() is called. But this call should complete for takePicture() to succeed.
It is impossible to simply call
camera = new SurveillanceCamera(this, layoutForPreview);
camera.start();
camera.takePicture();
because to complete a setPreviewDisplay() call, you need a fully initialized Holder instance, but you only add the surface view in constructor.
It would be best to register a SurfaceHolder.Callback and call takePicture() from the surfaceChanged() callback.

Related

How to update TextureView SurfaceTextureListener

I am developing a camera app and I will use front and back camera. I am using TextureView like this:
<TextureView
android:id="#+id/textureView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
/>
and code behind:
renderer = new CameraRenderer(this, isFrontCamera);
textureView.setSurfaceTextureListener(renderer);
CameraRenderer class implemet SurfaceTextureListener
public class CameraRenderer implements Runnable, TextureView.SurfaceTextureListener{...
and I set camera in onSurfaceTextureAvailable method like this:
public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
if (renderThread != null && renderThread.isAlive()) {
renderThread.interrupt();
}
renderThread = new Thread(this);
surfaceTexture = surface;
gwidth = width;
gheight = height;
// Open camera
int cameraId;
if(isFrontCamera)
cameraId = getFrontCamera();
else
cameraId = getBackCamera();
camera = Camera.open(cameraId);
renderThread.start();
}
Problem:
When I want to change camera and click button I am creating a new CameraRenderer instance and set to textureView
textureView.setSurfaceTextureListener(renderer);
but onSurfaceTextureDestroyed method in CameraRenderer class never called, also onSurfaceTextureAvailable method is not called too.
I can call onSurfaceTextureDestroyed method myself but I can't set second camera preview to textureView because onSurfaceTextureAvailable method is not called second time.
Here is my onSurfaceTextureDestroyed method:
#Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
if (camera != null) {
camera.stopPreview();
camera.release();
}
if (renderThread != null && renderThread.isAlive()) {
renderThread.interrupt();
}
CameraFilter.release();
return true;
}
Last note: I tried set listener as null but not working.
So How can I re-set textureView Listener. Thanks in advance!

Taking picture while recording video on Android

I have written the Android service shown below for recording the front cam in the background. This works very well. But now I would like to also take a picture every 5 seconds while recording. Is this somehow possible? When I try to open a second camera (in another service) I'm getting an error.
public class RecorderService extends Service implements SurfaceHolder.Callback {
private WindowManager windowManager;
private SurfaceView surfaceView;
private Camera camera = null;
private MediaRecorder mediaRecorder = null;
#Override
public void onCreate() {
// Create new SurfaceView, set its size to 1x1, move it to the top left corner and set this service as a callback
windowManager = (WindowManager) this.getSystemService(Context.WINDOW_SERVICE);
surfaceView = new SurfaceView(this);
WindowManager.LayoutParams layoutParams = new WindowManager.LayoutParams(
1, 1,
WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH,
PixelFormat.TRANSLUCENT
);
layoutParams.gravity = Gravity.LEFT | Gravity.TOP;
windowManager.addView(surfaceView, layoutParams);
surfaceView.getHolder().addCallback(this);
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
Intent notificationIntent = new Intent(this, MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0,
notificationIntent, 0);
Notification notification = new NotificationCompat.Builder(this)
//.setSmallIcon(R.mipmap.app_icon)
.setContentTitle("Background Video Recorder")
.setContentText("")
.setContentIntent(pendingIntent).build();
startForeground(MainActivity.NOTIFICATION_ID_RECORDER_SERVICE, notification);
return Service.START_NOT_STICKY;
}
// Method called right after Surface created (initializing and starting MediaRecorder)
#Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
camera = Camera.open(1);
mediaRecorder = new MediaRecorder();
camera.unlock();
mediaRecorder.setPreviewDisplay(surfaceHolder.getSurface());
mediaRecorder.setCamera(camera);
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
mediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_720P));
FileUtil.createDir("/storage/emulated/0/Study/Camera");
mediaRecorder.setOutputFile("/storage/emulated/0/Study/Camera/" + Long.toString(System.currentTimeMillis()) + ".mp4");
try { mediaRecorder.prepare(); } catch (Exception e) {}
mediaRecorder.start();
try {
camera.setPreviewDisplay(surfaceHolder);
} catch (IOException e) {
e.printStackTrace();
}
Runnable runnable = new PictureThread(camera);
Thread thread = new Thread(runnable);
thread.start();
}
// Stop recording and remove SurfaceView
#Override
public void onDestroy() {
mediaRecorder.stop();
mediaRecorder.reset();
mediaRecorder.release();
camera.lock();
camera.release();
windowManager.removeView(surfaceView);
}
#Override
public void surfaceChanged(SurfaceHolder surfaceHolder, int format, int width, int height) {}
#Override
public void surfaceDestroyed(SurfaceHolder surfaceHolder) {}
#Override
public IBinder onBind(Intent intent) { return null; }
}
Edit: I have now written a thread PictureThread. This thread is started from RecorderService and tries to take a picture while video recording.
public class PictureThread implements Runnable {
private final static String TAG = PictureThread.class.getSimpleName();
private Camera camera;
PictureThread(Camera camera) {
this.camera = camera;
}
#Override
public void run() {
camera.startPreview();
camera.takePicture(shutterCallback, rawCallback, jpegCallback);
}
Camera.ShutterCallback shutterCallback = new Camera.ShutterCallback() {
public void onShutter() {
}
};
Camera.PictureCallback rawCallback = new Camera.PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
}
};
Camera.PictureCallback jpegCallback = new Camera.PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
Log.i(TAG, "onPictureTaken - jpeg");
}
};
}
Unfortunately jpegCallback gets never called (i.e. the Log message is never printed). When I open the camera app of my tablet then I can take pictures while video recording, so this should be possible.
I have also tried the Camera2 API example as suggested by Alex Cohn (https://github.com/mobapptuts/android_camera2_api_video_app). Recording a video works and also taking a picture works but when I try to take a picture while recording, no picture is created (but also no error). Nevertheless, I have found this example app not working very reliable (perhaps there is another example app).
Edit 2: The shutterCallback and rawCallback of takePicture gets called but the data of the rawCallback is null. The jpegCallback gets never called.. Any idea why and how this can be solved? I have also tried to wait in the thread for a period of time to give the callback time for being called and I have tried to make the callbacks static in my main activity (so that it gets not garbage collected). Nothing worked.

Edit:
With the clarification:
The old camera API supports calling takePicture() while video is being recorded, if Camera.Parameters.isVideoSnapshotSupported reports true on the device is question.
Just hold on to the same camera instance you're passing into the MediaRecorder, and call Camera.takePicture() on it.
Camera2 also supports this with more flexibility, by creating a session with preview, recording, and JPEG outputs at the same time.
Original answer:
If you mean taking pictures with the back camera, while recording with the front camera - that's device-dependent. Some devices have enough hardware resources to run multiple cameras at once, but most won't (they share processing hardware between the two cameras).
The only way to tell if multiple cameras can be used at once is to try opening a second camera when one is already open. If it works, you should be good to go; if not, that device doesn't support multiple cameras at once.

No, you cannot open separate camera instances for video recording and stills capture. The deprecated Camera API is not reliable for such tasks (see e.g. Android camera parameter IsVideoSnapshotSupported incorrectly set to false about Samsung S4).
You can use camera2 API (on devices that support such mode) to capture different formats and resolutions from the same camera instance. Here is a video tutorial: https://www.nigeapptuts.com/android-video-app-still-capture-recording/

Android camera focusing only once

We are developing an app for the Vuzix M100, which should continuously read a barcode and display the result in a textView. Therefore, the camera takes a picture every 5 seconds and sends the bitmap to the zxing barcode scanner. We are almost done, but the camera is only focusing at the first picture. Any suggestions?
This is the important part of our code:
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = (TextView) findViewById(R.id.textView1);
mPreview = (SurfaceView) findViewById(R.id.sv1);
mPreview.getHolder().addCallback(this);
mCamera = Camera.open();
final Parameters param = mCamera.getParameters();
param.setJpegQuality(100);
param.setPictureSize(1600, 1200);
param.setFocusMode(param.FOCUS_MODE_CONTINUOUS_PICTURE);
param.setSceneMode(Parameters.SCENE_MODE_BARCODE);
mCamera.setParameters(param);
final Handler h = new Handler();
final int delay = 5000;
h.postDelayed(new Runnable(){
int count = 1;
public void run(){
tryAutoFocus();
param.setFocusMode(param.FOCUS_MODE_FIXED);
param.setFocusMode(param.FOCUS_MODE_AUTO);
h.postDelayed(this, delay);
}
}, delay);
}
.
private void tryAutoFocus() {
final PictureCallback myPictureCallback = new PictureCallback() {
#Override
public void onPictureTaken(byte[] data, Camera camera) {
try {
Options options = new BitmapFactory.Options();
options.inScaled = false;
Bitmap bmp = BitmapFactory.decodeByteArray(data, 0, data.length, options);
createExternalStoragePublicPicture(bmp);
} catch (Exception e) {
e.printStackTrace();
}
}
};
AutoFocusCallback myAutoFocusCallback = new AutoFocusCallback() {
#Override
public void onAutoFocus(boolean success, Camera arg1) {
// TODO: Problem: Fokussiert nur beim ersten Foto
mCamera.takePicture(null, null, null, myPictureCallback);
mCamera.cancelAutoFocus();
mCamera.startPreview();
}
};
mCamera.autoFocus(myAutoFocusCallback);
}

This is an old question, but still:
Note that setting a scene via Camera.Parameters.setSceneMode() may actually override any previous setting. Quoting the API documentation:
Changing scene mode may override other parameters (such as flash mode, focus mode, white balance). For example, suppose originally flash mode is on and supported flash modes are on/off. In night scene mode, both flash mode and supported flash mode may be changed to off. After setting scene mode, applications should call getParameters to know if some parameters are changed.
Also the docs imply that not only the current settings may be overriden, but also the supported parameter values.
So I suggest to:
Set the scene mode before setting the focus mode
After setting the scene mode, check if the desired focus mode is still supported with getSupportedFocusModes()

recreating camera object after error 100 (camera server died)

I have classic android app with camera preview (common implem that can be found in many tutorials [marakana etc.]) that is supposed to take picture in a given time interval. Threading and killing threads is done, errors such "method called after release" are handled. But sometimes the well-known error 100 occurs. I accepted the fact that it happens and tried to handle it too. I implemented ErrorCallback and its onError method where the current camera object is released and instantiated a new one as written in official documentation.
But (with no surprise) it is not enough. New camera is maybe wrongly allocated because an message "CameraDemo has been exited unexpectedly" appears now.
I've read many docs and examples in hope, that a proper proceeding will be somewhere explained but no one has such problem apparently. So I would like to ask what else should I do beside releasing and creating new camera? Here is the code:
ErrorCallback CEC = new ErrorCallback()
{
public void onError(int error, Camera camera)
{
Log.d("CameraDemo", "camera error detected");
if(error == Camera.CAMERA_ERROR_SERVER_DIED)
{
Log.d("CameraDemo", "attempting to reinstantiate new camera");
camera.stopPreview();
camera.setPreviewCallback(null);
camera.release(); //written in documentation...
camera = null;
camera = Camera.open();
}
}
};
Shortly - if I release and recreate camera in onError callback then RuntimeException Method called after release (takePicture) is raised. So should I somehow assign the surface holder to camera again or recreate the surface holder too?
It would be enough to direct me e.g. to some forums, where it is described or solved, etc. Thanks for any help.

In my app to handle the camere i use this :
public void onResume() {
super.onResume();
if(mCamera == null)
mCamera = getCameraInstance():
}
public static Camera getCameraInstance() {
mCamera = null;
try {
mCamera = Camera.open();
Parameters parameters = mCamera.getParameters();
mCamera.cancelAutoFocus();
mCamera.setPreviewCallback(yourPreviewCb);
mCamera.startPreview();
mCamera.setParameters(parameters);
mCamera.autoFocus(yourAutoFocusCB);
} catch (Exception e) {
//TODO
}
return mCamera;
}
The mCamera = null in the getCameraInstance() is just to be sure there is no camera running at all.
I think you need to recreate a complete camera, not just open it with the
camera.open();
Set this in the onResume or in the error callback, depending on your needs.

This is how I fixed it, here is a sample of code, think you get the idea:
private Camera camera;
// code...
public Camera getCameraInstance() {
Camera camera = Camera.open();
// code...
camera.setErrorCallback(new ErrorCallback() {
#Override
public void onError(int error, Camera camera) {
if(error == Camera.CAMERA_ERROR_SERVER_DIED) {
releaseCamera();
startCamera();
}
}
});
return camera;
}
protected void startCamera() {
if(getCamera() == null)
setCamera(getCameraInstance());
refreshCamera();
}
protected void releaseCamera() {
if (getCamera() != null) {
getCamera().release();
setCamera(null);
}
}
public Camera getCamera() {
return camera;
}
public void setCamera(Camera camera) {
this.camera = camera;
}

Taking picture from camera without preview

I am writing an Android 1.5 application which starts just after boot-up. This is a Service and should take a picture without preview. This app will log the light density in some areas whatever. I was able to take a picture but the picture was black.
After researching for a long time, I came across a bug thread about it. If you don't generate a preview, the image will be black since Android camera needs preview to setup exposure and focus. I've created a SurfaceView and the listener, but the onSurfaceCreated() event never gets fired.
I guess the reason is, the surface is not being created visually. I've also seen some examples of calling the camera statically with MediaStore.CAPTURE_OR_SOMETHING which takes a picture and saves in the desired folder with two lines of code, but it doesn't take a picture too.
Do I need to use IPC and bindService() to call this function? Or is there an alternative method to achieve this?

it is really weird that camera on android platform can't stream video until it given valid preview surface. it seems that the architects of the platform was not thinking about 3rd party video streaming applications at all. even for augmented reality case the picture can be presented as some kind of visual substitution, not real time camera stream.
anyway, you can simply resize preview surface to 1x1 pixels and put it somewhere in the corner of the widget (visual element). please pay attention - resize preview surface, not camera frame size.
of course such trick does not eliminate unwanted data streaming (for preview) which consumes some system resources and battery.

I found the answer to this in the Android Camera Docs.
Note: It is possible to use MediaRecorder without creating a camera
preview first and skip the first few steps of this process. However,
since users typically prefer to see a preview before starting a
recording, that process is not discussed here.
You can find the step by step instructions at the link above. After the instructions, it will state the quote that I have provided above.

Actually it is possible, but you have to fake the preview with a dummy SurfaceView
SurfaceView view = new SurfaceView(this);
c.setPreviewDisplay(view.getHolder());
c.startPreview();
c.takePicture(shutterCallback, rawPictureCallback, jpegPictureCallback);
Update 9/21/11: Apparently this does not work for every Android device.

Taking the Photo
Get this working first before trying to hide the preview.
Correctly set up the preview
Use a SurfaceView (pre-Android-4.0 compatibility) or SurfaceTexture (Android 4+, can be made transparent)
Set and initialise it before taking the photo
Wait for the SurfaceView's SurfaceHolder (via getHolder()) to report surfaceCreated() or the TextureView to report onSurfaceTextureAvailable to its SurfaceTextureListener before setting and initialising the preview.
Ensure the preview is visible:
Add it to the WindowManager
Ensure its layout size is at least 1x1 pixels (you might want to start by making it MATCH_PARENT x MATCH_PARENT for testing)
Ensure its visibility is View.VISIBLE (which seems to be the default if you don't specify it)
Ensure you use the FLAG_HARDWARE_ACCELERATED in the LayoutParams if it's a TextureView.
Use takePicture's JPEG callback since the documentation says the other callbacks aren't supported on all devices
Troubleshooting
If surfaceCreated/onSurfaceTextureAvailable doesn't get called, the SurfaceView/TextureView probably isn't being displayed.
If takePicture fails, first ensure the preview is working correctly. You can remove your takePicture call and let the preview run to see if it displays on the screen.
If the picture is darker than it should be, you might need to delay for about a second before calling takePicture so that the camera has time to adjust its exposure once the preview has started.
Hiding the Preview
Make the preview View 1x1 size to minimise its visibility (or try 8x16 for possibly more reliability)
new WindowManager.LayoutParams(1, 1, /*...*/)
Move the preview out of the centre to reduce its noticeability:
new WindowManager.LayoutParams(width, height,
Integer.MIN_VALUE, Integer.MIN_VALUE, /*...*/)
Make the preview transparent (only works for TextureView)
WindowManager.LayoutParams params = new WindowManager.LayoutParams(
width, height, /*...*/
PixelFormat.TRANSPARENT);
params.alpha = 0;
Working Example (tested on Sony Xperia M, Android 4.3)
/** Takes a single photo on service start. */
public class PhotoTakingService extends Service {
#Override
public void onCreate() {
super.onCreate();
takePhoto(this);
}
#SuppressWarnings("deprecation")
private static void takePhoto(final Context context) {
final SurfaceView preview = new SurfaceView(context);
SurfaceHolder holder = preview.getHolder();
// deprecated setting, but required on Android versions prior to 3.0
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
holder.addCallback(new Callback() {
#Override
//The preview must happen at or after this point or takePicture fails
public void surfaceCreated(SurfaceHolder holder) {
showMessage("Surface created");
Camera camera = null;
try {
camera = Camera.open();
showMessage("Opened camera");
try {
camera.setPreviewDisplay(holder);
} catch (IOException e) {
throw new RuntimeException(e);
}
camera.startPreview();
showMessage("Started preview");
camera.takePicture(null, null, new PictureCallback() {
#Override
public void onPictureTaken(byte[] data, Camera camera) {
showMessage("Took picture");
camera.release();
}
});
} catch (Exception e) {
if (camera != null)
camera.release();
throw new RuntimeException(e);
}
}
#Override public void surfaceDestroyed(SurfaceHolder holder) {}
#Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {}
});
WindowManager wm = (WindowManager)context
.getSystemService(Context.WINDOW_SERVICE);
WindowManager.LayoutParams params = new WindowManager.LayoutParams(
1, 1, //Must be at least 1x1
WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
0,
//Don't know if this is a safe default
PixelFormat.UNKNOWN);
//Don't set the preview visibility to GONE or INVISIBLE
wm.addView(preview, params);
}
private static void showMessage(String message) {
Log.i("Camera", message);
}
#Override public IBinder onBind(Intent intent) { return null; }
}

On Android 4.0 and above (API level >= 14), you can use TextureView to preview the camera stream and make it invisible so as to not show it to the user. Here's how:
First create a class to implement a SurfaceTextureListener that will get the create/update callbacks for the preview surface. This class also takes a camera object as input, so that it can call the camera's startPreview function as soon as the surface is created:
public class CamPreview extends TextureView implements SurfaceTextureListener {
private Camera mCamera;
public CamPreview(Context context, Camera camera) {
super(context);
mCamera = camera;
}
#Override
public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
Camera.Size previewSize = mCamera.getParameters().getPreviewSize();
setLayoutParams(new FrameLayout.LayoutParams(
previewSize.width, previewSize.height, Gravity.CENTER));
try{
mCamera.setPreviewTexture(surface);
} catch (IOException t) {}
mCamera.startPreview();
this.setVisibility(INVISIBLE); // Make the surface invisible as soon as it is created
}
#Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {
// Put code here to handle texture size change if you want to
}
#Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
return true;
}
#Override
public void onSurfaceTextureUpdated(SurfaceTexture surface) {
// Update your view here!
}
}
You'll also need to implement a callback class to process the preview data:
public class CamCallback implements Camera.PreviewCallback{
public void onPreviewFrame(byte[] data, Camera camera){
// Process the camera data here
}
}
Use the above CamPreview and CamCallback classes to setup the camera in your activity's onCreate() or similar startup function:
// Setup the camera and the preview object
Camera mCamera = Camera.open(0);
CamPreview camPreview = new CamPreview(Context,mCamera);
camPreview.setSurfaceTextureListener(camPreview);
// Connect the preview object to a FrameLayout in your UI
// You'll have to create a FrameLayout object in your UI to place this preview in
FrameLayout preview = (FrameLayout) findViewById(R.id.cameraView);
preview.addView(camPreview);
// Attach a callback for preview
CamCallback camCallback = new CamCallback();
mCamera.setPreviewCallback(camCallback);

There is a way of doing this but it's somewhat tricky.
what should be done, is attach a surfaceholder to the window manager from the service
WindowManager wm = (WindowManager) mCtx.getSystemService(Context.WINDOW_SERVICE);
params = new WindowManager.LayoutParams(WindowManager.LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH,
PixelFormat.TRANSLUCENT);
wm.addView(surfaceview, params);
and then set
surfaceview.setZOrderOnTop(true);
mHolder.setFormat(PixelFormat.TRANSPARENT);
where mHolder is the holder you get from the surface view.
this way, you can play with the surfaceview's alpha, make it completly transparent, but the camera will still get frames.
that's how i do it. hope it helps :)

We solved this problem by using a dummy SurfaceView (not added to actual GUI) in versions below 3.0 (or let's say 4.0 as a camera service on a tablet does not really make sense).
In versions >= 4.0 this worked in the emulator only ;(
The use of SurfaceTexture (and setSurfaceTexture()) instead of SurfaceView (and setSurfaceView()) worked here. At least this works on Nexus S.
I think this really is a shortcoming of the Android framework.

In the "Working Example by Sam" (Thank you Sam... )
if at istruction "wm.addView(preview, params);"
obtain exception "Unable to add window android.view.ViewRoot -- permission denied for this window type"
resolve by using this permission in AndroidManifest:
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>

You can try this working code, This service click front picture, if you want to capture back camera picture then uncomment back camera in code and comment front camera.
Note :- Allow Camera and Storage permission to App And startService from Activity or anywhere.
public class MyService extends Service {
#Nullable
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public void onCreate() {
super.onCreate();
CapturePhoto();
}
private void CapturePhoto() {
Log.d("kkkk","Preparing to take photo");
Camera camera = null;
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
int frontCamera = 1;
//int backCamera=0;
Camera.getCameraInfo(frontCamera, cameraInfo);
try {
camera = Camera.open(frontCamera);
} catch (RuntimeException e) {
Log.d("kkkk","Camera not available: " + 1);
camera = null;
//e.printStackTrace();
}
try {
if (null == camera) {
Log.d("kkkk","Could not get camera instance");
} else {
Log.d("kkkk","Got the camera, creating the dummy surface texture");
try {
camera.setPreviewTexture(new SurfaceTexture(0));
camera.startPreview();
} catch (Exception e) {
Log.d("kkkk","Could not set the surface preview texture");
e.printStackTrace();
}
camera.takePicture(null, null, new Camera.PictureCallback() {
#Override
public void onPictureTaken(byte[] data, Camera camera) {
File pictureFileDir=new File("/sdcard/CaptureByService");
if (!pictureFileDir.exists() && !pictureFileDir.mkdirs()) {
pictureFileDir.mkdirs();
}
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyymmddhhmmss");
String date = dateFormat.format(new Date());
String photoFile = "ServiceClickedPic_" + "_" + date + ".jpg";
String filename = pictureFileDir.getPath() + File.separator + photoFile;
File mainPicture = new File(filename);
try {
FileOutputStream fos = new FileOutputStream(mainPicture);
fos.write(data);
fos.close();
Log.d("kkkk","image saved");
} catch (Exception error) {
Log.d("kkkk","Image could not be saved");
}
camera.release();
}
});
}
} catch (Exception e) {
camera.release();
}
}
}

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

android: camera is not taking a picture - android

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