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Jan 03, 2018 This is an Android application to display and record the video from a USB camera which is connected to a smart phone or a tablet device. For more details.
Camera public class Camera extends ↳ android.hardware.Camera This class was deprecated in API level 21. We recommend using the new API for new applications. The Camera class is used to set image capture settings, start/stop preview, snap pictures, and retrieve frames for encoding for video. This class is a client for the Camera service, which manages the actual camera hardware. To access the device camera, you must declare the permission in your Android Manifest. Also be sure to include the manifest element to declare camera features used by your application. For example, if you use the camera and auto-focus feature, your Manifest should include the following: To take pictures with this class, use the following steps:.
Obtain an instance of Camera from. Get existing (default) settings with. If necessary, modify the returned object and call. Call to ensure correct orientation of preview. Important: Pass a fully initialized to.
Without a surface, the camera will be unable to start the preview. Important: Call to start updating the preview surface. Preview must be started before you can take a picture. When you want, call to capture a photo. Wait for the callbacks to provide the actual image data. After taking a picture, preview display will have stopped.
To take more photos, call again first. Call to stop updating the preview surface. Important: Call to release the camera for use by other applications. Applications should release the camera immediately in (and re- it in ).
To quickly switch to video recording mode, use these steps:. Obtain and initialize a Camera and start preview as described above. Call to allow the media process to access the camera.
Camera For Android Phone
Pass the camera to. See information about video recording.
When finished recording, call to re-acquire and re-lock the camera. If desired, restart preview and take more photos or videos. Call and as described above. This class is not thread-safe, and is meant for use from one event thread.
Most long-running operations (preview, focus, photo capture, etc) happen asynchronously and invoke callbacks as necessary. Callbacks will be invoked on the event thread was called from. This class's methods must never be called from multiple threads at once. Caution: Different Android-powered devices may have different hardware specifications, such as megapixel ratings and auto-focus capabilities. In order for your application to be compatible with more devices, you should not make assumptions about the device camera specifications.
Developer Guides For more information about using cameras, read the developer guide. Summary Nested classes class This class was deprecated in API level 21.
We recommend using the new API for new applications. Interface This interface was deprecated in API level 21. We recommend using the new API for new applications. Interface This interface was deprecated in API level 21. We recommend using the new API for new applications. Class This class was deprecated in API level 21. We recommend using the new API for new applications.
Interface This interface was deprecated in API level 21. We recommend using the new API for new applications. Class This class was deprecated in API level 21. We recommend using the new API for new applications. Interface This interface was deprecated in API level 21. We recommend using the new API for new applications. Interface This interface was deprecated in API level 21.
We recommend using the new API for new applications. Class This class was deprecated in API level 21. We recommend using the new API for new applications. Interface This interface was deprecated in API level 21. We recommend using the new API for new applications. Interface This interface was deprecated in API level 21.
We recommend using the new API for new applications. Interface This interface was deprecated in API level 21. We recommend using the new API for new applications. Class This class was deprecated in API level 21. We recommend using the new API for new applications. Constants Broadcast Action: A new picture is taken by the camera, and the entry of the picture has been added to the media store.
Broadcast Action: A new video is recorded by the camera, and the entry of the video has been added to the media store. Int Camera was disconnected due to use by higher priority user.
Int Media server died. Int Unspecified camera error. Public methods final void (byte callbackBuffer) Adds a pre-allocated buffer to the preview callback buffer queue. Final void ( cb) Starts camera auto-focus and registers a callback function to run when the camera is focused. Final void Cancels any auto-focus function in progress. Final boolean (boolean enabled) Enable or disable the default shutter sound when taking a picture. Static void (int cameraId, cameraInfo) Returns the information about a particular camera.
Static int Returns the number of physical cameras available on this device. Returns the current settings for this Camera service. Final void Re-locks the camera to prevent other processes from accessing it. Static Creates a new Camera object to access the first back-facing camera on the device. Static (int cameraId) Creates a new Camera object to access a particular hardware camera.
Final void Reconnects to the camera service after another process used it. Final void Disconnects and releases the Camera object resources. Void ( cb) Sets camera auto-focus move callback. Final void (int degrees) Set the clockwise rotation of preview display in degrees. Final void ( cb) Registers a callback to be invoked when an error occurs. Final void ( listener) Registers a listener to be notified about the faces detected in the preview frame.
Final void ( cb) Installs a callback to be invoked for the next preview frame in addition to displaying it on the screen. Void ( params) Changes the settings for this Camera service. Final void ( cb) Installs a callback to be invoked for every preview frame in addition to displaying them on the screen. Final void ( cb) Installs a callback to be invoked for every preview frame, using buffers supplied with, in addition to displaying them on the screen. Final void ( holder) Sets the to be used for live preview. Final void ( surfaceTexture) Sets the to be used for live preview. Final void ( listener) Registers a listener to be notified when the zoom value is updated by the camera driver during smooth zoom.
Final void Starts the face detection. Final void Starts capturing and drawing preview frames to the screen. Final void (int value) Zooms to the requested value smoothly. Final void Stops the face detection.
Final void Stops capturing and drawing preview frames to the surface, and resets the camera for a future call to. Final void Stops the smooth zoom.
Final void ( shutter, raw, postview, jpeg) Triggers an asynchronous image capture. Final void ( shutter, raw, jpeg) Equivalent to takePicture(Shutter, raw, null, jpeg). Final void Unlocks the camera to allow another process to access it. Protected methods void Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
Inherited methods From class. Creates and returns a copy of this object. Boolean ( obj) Indicates whether some other object is 'equal to' this one. Void Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. Final Returns the runtime class of this Object. Int Returns a hash code value for the object.
Final void Wakes up a single thread that is waiting on this object's monitor. Final void Wakes up all threads that are waiting on this object's monitor.
Returns a string representation of the object. Final void (long millis, int nanos) Causes the current thread to wait until another thread invokes the method or the method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed. Final void (long millis) Causes the current thread to wait until either another thread invokes the method or the method for this object, or a specified amount of time has elapsed. Final void Causes the current thread to wait until another thread invokes the method or the method for this object. Added in ACTIONNEWPICTURE Broadcast Action: A new picture is taken by the camera, and the entry of the picture has been added to the media store. Is URI of the picture.
In this broadcast was removed, and applications are recommended to use. In this broadcast has been brought back, but only for registered receivers.
Apps that are actively running can again listen to the broadcast if they want an immediate clear signal about a picture being taken, however anything doing heavy work (or needing to be launched) as a result of this should still use JobScheduler. Constant Value: 'android.hardware.action.NEWPICTURE'. Added in ACTIONNEWVIDEO Broadcast Action: A new video is recorded by the camera, and the entry of the video has been added to the media store. Is URI of the video. In this broadcast was removed, and applications are recommended to use. In this broadcast has been brought back, but only for registered receivers. Apps that are actively running can again listen to the broadcast if they want an immediate clear signal about a video being taken, however anything doing heavy work (or needing to be launched) as a result of this should still use JobScheduler.
Constant Value: 'android.hardware.action.NEWVIDEO'. Added in void addCallbackBuffer (byte callbackBuffer) Adds a pre-allocated buffer to the preview callback buffer queue. Applications can add one or more buffers to the queue. When a preview frame arrives and there is still at least one available buffer, the buffer will be used and removed from the queue. Then preview callback is invoked with the buffer. If a frame arrives and there is no buffer left, the frame is discarded.
Applications should add buffers back when they finish processing the data in them. For formats besides YV12, the size of the buffer is determined by multiplying the preview image width, height, and bytes per pixel. The width and height can be read from. Bytes per pixel can be computed from / 8, using the image format from.
If using the format, the size can be calculated using the equations listed in. This method is only necessary when is used. When or are used, buffers are automatically allocated. When a supplied buffer is too small to hold the preview frame data, preview callback will return null and the buffer will be removed from the buffer queue. Parameters callbackBuffer byte: the buffer to add to the queue. The size of the buffer must match the values described above. Added in void autoFocus ( cb) Starts camera auto-focus and registers a callback function to run when the camera is focused.
This method is only valid when preview is active (between and before ). Callers should check to determine if this method should be called. If the camera does not support auto-focus, it is a no-op and callback will be called immediately.
If your application should not be installed on devices without auto-focus, you must declare that your application uses auto-focus with the manifest element. If the current flash mode is not, flash may be fired during auto-focus, depending on the driver and camera hardware. Auto-exposure lock and auto-white balance locks do not change during and after autofocus. But auto-focus routine may stop auto-exposure and auto-white balance transiently during focusing. Stopping preview with, or triggering still image capture with, will not change the the focus position.
Applications must call cancelAutoFocus to reset the focus. If autofocus is successful, consider using to properly play back an autofocus success sound to the user. Parameters cb Camera.AutoFocusCallback: the callback to run Throws if starting autofocus fails; usually this would be because of a hardware or other low-level error, or because release has been called on this Camera instance. Added in boolean enableShutterSound (boolean enabled) Enable or disable the default shutter sound when taking a picture. By default, the camera plays the system-defined camera shutter sound when is called. Using this method, the shutter sound can be disabled.
It is strongly recommended that an alternative shutter sound is played in the when the system shutter sound is disabled. Note that devices may not always allow disabling the camera shutter sound. If the shutter sound state cannot be set to the desired value, this method will return false. Can be used to determine whether the device will allow the shutter sound to be disabled. Parameters enabled boolean: whether the camera should play the system shutter sound when is called.
Returns boolean true if the shutter sound state was successfully changed. False if the shutter sound state could not be changed.
True is also returned if shutter sound playback is already set to the requested state. Throws if the call fails; usually this would be because of a hardware or other low-level error, or because release has been called on this Camera instance. Added in void lock Re-locks the camera to prevent other processes from accessing it. Camera objects are locked by default unless is called.
Normally is used instead. Since API level 14, camera is automatically locked for applications in. Applications can use the camera (ex: zoom) after recording starts. There is no need to call this after recording starts or stops.
If you are not recording video, you probably do not need this method. Throws if the camera cannot be re-locked (for example, if the camera is still in use by another process). Added in open (int cameraId) Creates a new Camera object to access a particular hardware camera. If the same camera is opened by other applications, this will throw a RuntimeException. You must call when you are done using the camera, otherwise it will remain locked and be unavailable to other applications. Your application should only have one Camera object active at a time for a particular hardware camera.
Callbacks from other methods are delivered to the event loop of the thread which called open. If this thread has no event loop, then callbacks are delivered to the main application event loop. If there is no main application event loop, callbacks are not delivered. Caution: On some devices, this method may take a long time to complete. It is best to call this method from a worker thread (possibly using ) to avoid blocking the main application UI thread.
Parameters cameraId int: the hardware camera to access, between 0 and -1. Returns a new Camera object, connected, locked and ready for use. Throws if opening the camera fails (for example, if the camera is in use by another process or device policy manager has disabled the camera). Added in void reconnect Reconnects to the camera service after another process used it.
After is called, another process may use the camera; when the process is done, you must reconnect to the camera, which will re-acquire the lock and allow you to continue using the camera. Since API level 14, camera is automatically locked for applications in.
Digital Camera Drivers
Applications can use the camera (ex: zoom) after recording starts. There is no need to call this after recording starts or stops. If you are not recording video, you probably do not need this method. Throws if a connection cannot be re-established (for example, if the camera is still in use by another process). If release has been called on this Camera instance.
Added in void setOneShotPreviewCallback ( cb) Installs a callback to be invoked for the next preview frame in addition to displaying it on the screen. After one invocation, the callback is cleared. This method can be called any time, even when preview is live.
Bluetooth Camera For Android
Any other preview callbacks are overridden. If you are using the preview data to create video or still images, strongly consider using to properly indicate image capture or recording start/stop to the user. Parameters cb Camera.PreviewCallback: a callback object that receives a copy of the next preview frame, or null to stop receiving callbacks. Throws if release has been called on this Camera instance. Added in void setPreviewCallback ( cb) Installs a callback to be invoked for every preview frame in addition to displaying them on the screen. The callback will be repeatedly called for as long as preview is active. This method can be called at any time, even while preview is live.
Any other preview callbacks are overridden. If you are using the preview data to create video or still images, strongly consider using to properly indicate image capture or recording start/stop to the user. Parameters cb Camera.PreviewCallback: a callback object that receives a copy of each preview frame, or null to stop receiving callbacks. Throws if release has been called on this Camera instance.
Added in void setPreviewCallbackWithBuffer ( cb) Installs a callback to be invoked for every preview frame, using buffers supplied with, in addition to displaying them on the screen. The callback will be repeatedly called for as long as preview is active and buffers are available. Any other preview callbacks are overridden. The purpose of this method is to improve preview efficiency and frame rate by allowing preview frame memory reuse. You must call at some point - before or after calling this method - or no callbacks will received.
The buffer queue will be cleared if this method is called with a null callback, is called, or is called. If you are using the preview data to create video or still images, strongly consider using to properly indicate image capture or recording start/stop to the user.
Parameters cb Camera.PreviewCallback: a callback object that receives a copy of the preview frame, or null to stop receiving callbacks and clear the buffer queue. Throws if release has been called on this Camera instance. Added in void setPreviewDisplay ( holder) Sets the to be used for live preview. Either a surface or surface texture is necessary for preview, and preview is necessary to take pictures.
The same surface can be re-set without harm. Setting a preview surface will un-set any preview surface texture that was set via. The must already contain a surface when this method is called. If you are using, you will need to register a with and wait for before calling setPreviewDisplay or starting preview. This method must be called before.
The one exception is that if the preview surface is not set (or set to null) before startPreview is called, then this method may be called once with a non-null parameter to set the preview surface. (This allows camera setup and surface creation to happen in parallel, saving time.) The preview surface may not otherwise change while preview is running. Parameters holder SurfaceHolder: containing the Surface on which to place the preview, or null to remove the preview surface Throws if the method fails (for example, if the surface is unavailable or unsuitable). If release has been called on this Camera instance. Added in void setPreviewTexture ( surfaceTexture) Sets the to be used for live preview. Either a surface or surface texture is necessary for preview, and preview is necessary to take pictures.
The same surface texture can be re-set without harm. Setting a preview surface texture will un-set any preview surface that was set via. This method must be called before.
The one exception is that if the preview surface texture is not set (or set to null) before startPreview is called, then this method may be called once with a non-null parameter to set the preview surface. (This allows camera setup and surface creation to happen in parallel, saving time.) The preview surface texture may not otherwise change while preview is running. The timestamps provided by for a SurfaceTexture set as the preview texture have an unspecified zero point, and cannot be directly compared between different cameras or different instances of the same camera, or across multiple runs of the same program. If you are using the preview data to create video or still images, strongly consider using to properly indicate image capture or recording start/stop to the user.
Parameters surfaceTexture SurfaceTexture: the to which the preview images are to be sent or null to remove the current preview surface texture Throws if the method fails (for example, if the surface texture is unavailable or unsuitable). If release has been called on this Camera instance. Added in void startFaceDetection Starts the face detection.
This should be called after preview is started. The camera will notify of the detected faces in the preview frame. The detected faces may be the same as the previous ones. Applications should call to stop the face detection.
This method is supported if returns a number larger than 0. If the face detection has started, apps should not call this again. When the face detection is running, and have no effect. The camera uses the detected faces to do auto-white balance, auto exposure, and autofocus. If the apps call, the camera will stop sending face callbacks. The last face callback indicates the areas used to do autofocus. After focus completes, face detection will resume sending face callbacks.
If the apps call, the face callbacks will also resume. After calling or, and then resuming preview with, the apps should call this method again to resume face detection. Throws if the face detection is unsupported. If the method fails or the face detection is already running. Added in void startSmoothZoom (int value) Zooms to the requested value smoothly. The driver will notify of the zoom value and whether zoom is stopped at the time.
For example, suppose the current zoom is 0 and startSmoothZoom is called with value 3. The method will be called three times with zoom values 1, 2, and 3.
Applications can call to stop the zoom earlier. Applications should not call startSmoothZoom again or change the zoom value before zoom stops. If the supplied zoom value equals to the current zoom value, no zoom callback will be generated. This method is supported if returns true.
Parameters value int: zoom value. The valid range is 0 to. Throws if the zoom value is invalid. If the method fails. Added in void takePicture ( shutter, raw, postview, jpeg) Triggers an asynchronous image capture. The camera service will initiate a series of callbacks to the application as the image capture progresses. The shutter callback occurs after the image is captured.
This can be used to trigger a sound to let the user know that image has been captured. The raw callback occurs when the raw image data is available (NOTE: the data will be null if there is no raw image callback buffer available or the raw image callback buffer is not large enough to hold the raw image). The postview callback occurs when a scaled, fully processed postview image is available (NOTE: not all hardware supports this).
The jpeg callback occurs when the compressed image is available. If the application does not need a particular callback, a null can be passed instead of a callback method. This method is only valid when preview is active (after ). Preview will be stopped after the image is taken; callers must call again if they want to re-start preview or take more pictures.
This should not be called between and. After calling this method, you must not call or take another picture until the JPEG callback has returned. Parameters shutter Camera.ShutterCallback: the callback for image capture moment, or null raw Camera.PictureCallback: the callback for raw (uncompressed) image data, or null postview Camera.PictureCallback: callback with postview image data, may be null jpeg Camera.PictureCallback: the callback for JPEG image data, or null Throws if starting picture capture fails; usually this would be because of a hardware or other low-level error, or because release has been called on this Camera instance. Added in void unlock Unlocks the camera to allow another process to access it.
Normally, the camera is locked to the process with an active Camera object until is called. To allow rapid handoff between processes, you can call this method to release the camera temporarily for another process to use; once the other process is done you can call to reclaim the camera. This must be done before calling. This cannot be called after recording starts. If you are not recording video, you probably do not need this method. Throws if the camera cannot be unlocked. Protected methods.
Added in void finalize Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. A subclass overrides the finalize method to dispose of system resources or to perform other cleanup. The general contract of finalize is that it is invoked if and when the Java™ virtual machine has determined that there is no longer any means by which this object can be accessed by any thread that has not yet died, except as a result of an action taken by the finalization of some other object or class which is ready to be finalized. The finalize method may take any action, including making this object available again to other threads; the usual purpose of finalize, however, is to perform cleanup actions before the object is irrevocably discarded. For example, the finalize method for an object that represents an input/output connection might perform explicit I/O transactions to break the connection before the object is permanently discarded.
The finalize method of class Object performs no special action; it simply returns normally. Subclasses of Object may override this definition. The Java programming language does not guarantee which thread will invoke the finalize method for any given object. It is guaranteed, however, that the thread that invokes finalize will not be holding any user-visible synchronization locks when finalize is invoked. If an uncaught exception is thrown by the finalize method, the exception is ignored and finalization of that object terminates. After the finalize method has been invoked for an object, no further action is taken until the Java virtual machine has again determined that there is no longer any means by which this object can be accessed by any thread that has not yet died, including possible actions by other objects or classes which are ready to be finalized, at which point the object may be discarded. The finalize method is never invoked more than once by a Java virtual machine for any given object.
Any exception thrown by the finalize method causes the finalization of this object to be halted, but is otherwise ignored.