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java.lang.Objectcom.google.zxing.client.android.camera.CameraManager
public final class CameraManager
This object wraps the Camera service object and expects to be the only one talking to it. The implementation encapsulates the steps needed to take preview-sized images, which are used for both preview and decoding.
Constructor Summary | |
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CameraManager(android.content.Context context)
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Method Summary | |
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PlanarYUVLuminanceSource |
buildLuminanceSource(byte[] data,
int width,
int height)
A factory method to build the appropriate LuminanceSource object based on the format of the preview buffers, as described by Camera.Parameters. |
void |
closeDriver()
Closes the camera driver if still in use. |
android.graphics.Rect |
getFramingRect()
Calculates the framing rect which the UI should draw to show the user where to place the barcode. |
android.graphics.Rect |
getFramingRectInPreview()
Like getFramingRect() but coordinates are in terms of the preview frame,
not UI / screen. |
void |
openDriver(android.view.SurfaceHolder holder)
Opens the camera driver and initializes the hardware parameters. |
void |
requestAutoFocus(android.os.Handler handler,
int message)
Asks the camera hardware to perform an autofocus. |
void |
requestPreviewFrame(android.os.Handler handler,
int message)
A single preview frame will be returned to the handler supplied. |
void |
setManualFramingRect(int width,
int height)
Allows third party apps to specify the scanning rectangle dimensions, rather than determine them automatically based on screen resolution. |
void |
startPreview()
Asks the camera hardware to begin drawing preview frames to the screen. |
void |
stopPreview()
Tells the camera to stop drawing preview frames. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public CameraManager(android.content.Context context)
Method Detail |
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public void openDriver(android.view.SurfaceHolder holder) throws java.io.IOException
holder
- The surface object which the camera will draw preview frames into.
java.io.IOException
- Indicates the camera driver failed to open.public void closeDriver()
public void startPreview()
public void stopPreview()
public void requestPreviewFrame(android.os.Handler handler, int message)
handler
- The handler to send the message to.message
- The what field of the message to be sent.public void requestAutoFocus(android.os.Handler handler, int message)
handler
- The Handler to notify when the autofocus completes.message
- The message to deliver.public android.graphics.Rect getFramingRect()
public android.graphics.Rect getFramingRectInPreview()
getFramingRect()
but coordinates are in terms of the preview frame,
not UI / screen.
public void setManualFramingRect(int width, int height)
width
- The width in pixels to scan.height
- The height in pixels to scan.public PlanarYUVLuminanceSource buildLuminanceSource(byte[] data, int width, int height)
data
- A preview frame.width
- The width of the image.height
- The height of the image.
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