How do I open the front camera on the Android platform

Question

More generally  if a device has more than one embedded camera  is there a way to initialize one of them in particular   I didn t find it in Android reference documentation    https   developer android com reference android hardware Camera html https   developer android com reference android hardware camera2 package-summary html https   developer android com reference android hardware camera2 CameraManager html   Samsung SHW-M100S has two cameras  If there is no reference to use two cameras  any idea how Samsung did

User · Answer

To open the back camera -  val cameraIntent   Intent MediaStore ACTION IMAGE CAPTURE  startActivityForResult cameraIntent  REQUEST CODE CAMERA    To open the front camera -  val cameraIntent   Intent MediaStore ACTION IMAGE CAPTURE  when        Build VERSION SDK INT  gt   Build VERSION CODES LOLLIPOP MR1  amp  amp  Build VERSION SDK INT  lt  Build VERSION CODES O - gt             cameraIntent putExtra  android intent extras CAMERA FACING   CameraCharacteristics LENS FACING FRONT      Tested on API 24 Android version 7 0 Samsung S6              Build VERSION SDK INT  gt   Build VERSION CODES O - gt             cameraIntent putExtra  android intent extras CAMERA FACING   CameraCharacteristics LENS FACING FRONT     Tested on API 27 Android version 8 0 Nexus 6P           cameraIntent putExtra  android intent extra USE FRONT CAMERA   true              else - gt  cameraIntent putExtra  android intent extras CAMERA FACING   1      Tested API 21 Android version 5 0 1 Samsung S4    startActivityForResult cameraIntent  REQUEST CODE CAMERA    I could not make it work for API 28 and above  Also  opening the front camera directly is not possible in some devices depends on the manufacturer

User · Answer

With the release of Android nbsp 2 3  Gingerbread   you can now use the android hardware Camera class to get the number of cameras  information about a specific camera  and get a reference to a specific Camera  Check out the new Camera APIs here

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As of Android 2 1  Android only supports a single camera in its SDK  It is likely that this will be added in a future Android release

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Camera camera     if  Camera getNumberOfCameras    gt   2           if you want to open front facing camera use this line        camera   Camera open CameraInfo CAMERA FACING FRONT          if you want to use the back facing camera     camera   Camera open CameraInfo CAMERA FACING BACK                      try       camera setPreviewDisplay  your surface holder here        camera startPreview            catch  Exception e          camera release           This is not the proper way  this is a solution for older devices that run Android 4 0 or older  This can be used for testing purposes  but not recommended for main development  This solution can be considered as a temporary solution only  But this solution has helped many so I don t intend to delete this answer

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private Camera openFrontFacingCameraGingerbread         int cameraCount   0      Camera cam   null      Camera CameraInfo cameraInfo   new Camera CameraInfo        cameraCount   Camera getNumberOfCameras        for  int camIdx   0  camIdx  lt  cameraCount  camIdx              Camera getCameraInfo camIdx  cameraInfo           if  cameraInfo facing    Camera CameraInfo CAMERA FACING FRONT                try                   cam   Camera open camIdx                 catch  RuntimeException e                    Log e TAG   Camera failed to open      e getLocalizedMessage                                        return cam      Add the following permissions in the AndroidManifest xml file    lt uses-permission android name  android permission CAMERA    gt   lt uses-feature android name  android hardware camera  android required  false    gt   lt uses-feature android name  android hardware camera front  android required  false    gt    Note  This feature is available in Gingerbread 2 3  and Up Android Version

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build gradle   dependencies          compile  com google android gms play-services-vision 9 4 0           Set View  CameraSourcePreview mPreview    CameraSourcePreview  findViewById R id preview    GraphicOverlay mGraphicOverlay    GraphicOverlay  findViewById R id faceOverlay    CameraSource mCameraSource   new CameraSource Builder context  detector                               setRequestedPreviewSize 640  480                               setFacing CameraSource CAMERA FACING FRONT                               setRequestedFps 30 0f                               build                mPreview start mCameraSource  mGraphicOverlay

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public void surfaceCreated SurfaceHolder holder        try           mCamera   Camera open            mCamera setDisplayOrientation 90           mCamera setPreviewDisplay holder            Camera Parameters p   mCamera getParameters            p set  camera-id  2           mCamera setParameters p            catch  IOException e               TODO Auto-generated catch block         e printStackTrace

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For API 21  5 0  and later you can use the CameraManager API s  try       String desiredCameraId   null      for String cameraId   mCameraIDsList            CameraCharacteristics chars    mCameraManager getCameraCharacteristics cameraId           List lt CameraCharacteristics Key lt   gt  gt  keys   chars getKeys            try               if CameraCharacteristics LENS FACING FRONT    chars get CameraCharacteristics LENS FACING                       This is the one we want                 desiredCameraId   cameraId                 break                          catch IllegalArgumentException e                   This key not implemented  which is a bit of a pain  Either guess - assume the first one                is rear  second one is front  or give up

User · Answer

All older answers  methods are deprecated by Google  supposedly because of troubles like this   since API 21 you need to use the Camera 2 API      This class was deprecated in API level 21  We recommend using the new   android hardware camera2 API for new applications    In the newer API you have almost complete power over the Android device camera and documentation explicitly advice to  String   getCameraIdList     and then use obtained CameraId to open the camera   void openCamera String cameraId  CameraDevice StateCallback callback  Handler handler    99  of the frontal cameras have id    1   and the back camera id    0  according to this      Non-removable cameras use integers starting at 0 for their   identifiers  while removable cameras have a unique identifier for each   individual device  even if they are the same model    However  this means if device situation is rare like just 1-frontal -camera tablet you need to count how many embedded cameras you have  and place the order of the camera by its importance   0    So CAMERA FACING FRONT    1 CAMERA FACING BACK    0  which implies that the back camera is more important than frontal   I don t know about a uniform method to identify the frontal camera on all Android devices  Simply said  the Android OS inside the device can t really find out which camera is exactly where for some reasons  maybe the only camera hardcoded id is an integer representing its importance or maybe on some devices whichever side you turn will be     back    Documentation  https   developer android com reference android hardware camera2 package-summary html  Explicit Examples  https   github com googlesamples android-Camera2Basic    For the older API  it is not recommended  because it will not work on modern phones newer Android version and transfer is a pain-in-the-arse   Just use the same Integer CameraID   1  to open frontal camera like in this answer   cam   Camera open 1       If you trust OpenCV to do the camera part   Inside       lt org opencv android JavaCameraView         gt    use the following for the frontal camera           opencv camera id  1

[android] How do I open the "front camera" on the Android platform?

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