CameraManager (lib API)

java.lang.Object
- com.king.zxing.camera.CameraManager

```
public final class CameraManager
extends java.lang.Object
```
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.

嵌套类概要

嵌套类
限定符和类型类和说明

static interface CameraManager.OnSensorListener
传感器灯光亮度监听

static interface CameraManager.OnTorchListener

嵌套类
限定符和类型	类和说明
`static interface`	`CameraManager.OnSensorListener` 传感器灯光亮度监听
`static interface`	`CameraManager.OnTorchListener`

构造器概要

构造器
构造器和说明

CameraManager(Context context)

构造器
构造器和说明
`CameraManager(Context context)`

方法概要

所有方法实例方法具体方法
限定符和类型	方法和说明
`com.google.zxing.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.
`Point`	`getCameraResolution()`
`Rect`	`getFramingRect()` Calculates the framing rect which the UI should draw to show the user where to place the barcode.
`Rect`	`getFramingRectInPreview()` Like `getFramingRect()` but coordinates are in terms of the preview frame, not UI / screen.
`OpenCamera`	`getOpenCamera()`
`Point`	`getScreenResolution()`
`boolean`	`isOpen()`
`void`	`openDriver(SurfaceHolder holder)` Opens the camera driver and initializes the hardware parameters.
`void`	`requestPreviewFrame(Handler handler, int message)` A single preview frame will be returned to the handler supplied.
`void`	`sensorChanged(boolean tooDark, float ambientLightLux)`
`void`	`setFramingRectHorizontalOffset(int framingRectHorizontalOffset)`
`void`	`setFramingRectRatio(float framingRectRatio)`
`void`	`setFramingRectVerticalOffset(int framingRectVerticalOffset)`
`void`	`setFullScreenScan(boolean fullScreenScan)`
`void`	`setManualCameraId(int cameraId)` Allows third party apps to specify the camera ID, rather than determine it automatically based on available cameras and their orientation.
`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`	`setOnSensorListener(CameraManager.OnSensorListener listener)` 传感器光线照度监听
`void`	`setOnTorchListener(CameraManager.OnTorchListener listener)` 提供闪光灯监听
`void`	`setTorch(boolean newSetting)` Convenience method for `CaptureActivity`
`void`	`startPreview()` Asks the camera hardware to begin drawing preview frames to the screen.
`void`	`stopPreview()` Tells the camera to stop drawing preview frames.

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 构造器详细资料
  - CameraManager
```
public CameraManager(Context context)
```
- 方法详细资料
  - openDriver
```
public void openDriver(SurfaceHolder holder)
                throws java.io.IOException
```
    Opens the camera driver and initializes the hardware parameters.
    
    参数:
    
    holder - The surface object which the camera will draw preview frames into.
    
    抛出:
    
    java.io.IOException - Indicates the camera driver failed to open.
  - isOpen
```
public boolean isOpen()
```
  - getOpenCamera
```
public OpenCamera getOpenCamera()
```
  - closeDriver
```
public void closeDriver()
```
    Closes the camera driver if still in use.
  - startPreview
```
public void startPreview()
```
    Asks the camera hardware to begin drawing preview frames to the screen.
  - stopPreview
```
public void stopPreview()
```
    Tells the camera to stop drawing preview frames.
  - setTorch
```
public void setTorch(boolean newSetting)
```
    Convenience method for CaptureActivity
    
    参数:
    
    newSetting - if true, light should be turned on if currently off. And vice versa.
  - requestPreviewFrame
```
public void requestPreviewFrame(Handler handler,
                                int message)
```
    A single preview frame will be returned to the handler supplied. The data will arrive as byte[] in the message.obj field, with width and height encoded as message.arg1 and message.arg2, respectively.
    
    参数:
    
    handler - The handler to send the message to.
    
    message - The what field of the message to be sent.
  - getFramingRect
```
public Rect getFramingRect()
```
    Calculates the framing rect which the UI should draw to show the user where to place the barcode. This target helps with alignment as well as forces the user to hold the device far enough away to ensure the image will be in focus.
    
    返回:
    
    The rectangle to draw on screen in window coordinates.
  - getFramingRectInPreview
```
public Rect getFramingRectInPreview()
```
    Like getFramingRect() but coordinates are in terms of the preview frame, not UI / screen.
    
    返回:
    
    Rect expressing barcode scan area in terms of the preview size
  - setFullScreenScan
```
public void setFullScreenScan(boolean fullScreenScan)
```
  - setFramingRectRatio
```
public void setFramingRectRatio(float framingRectRatio)
```
  - setFramingRectVerticalOffset
```
public void setFramingRectVerticalOffset(int framingRectVerticalOffset)
```
  - setFramingRectHorizontalOffset
```
public void setFramingRectHorizontalOffset(int framingRectHorizontalOffset)
```
  - getCameraResolution
```
public Point getCameraResolution()
```
  - getScreenResolution
```
public Point getScreenResolution()
```
  - setManualCameraId
```
public void setManualCameraId(int cameraId)
```
    Allows third party apps to specify the camera ID, rather than determine it automatically based on available cameras and their orientation.
    
    参数:
    
    cameraId - camera ID of the camera to use. A negative value means "no preference".
  - setManualFramingRect
```
public 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.
    
    参数:
    
    width - The width in pixels to scan.
    
    height - The height in pixels to scan.
  - buildLuminanceSource
```
public com.google.zxing.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.
    
    参数:
    
    data - A preview frame.
    
    width - The width of the image.
    
    height - The height of the image.
    
    返回:
    
    A PlanarYUVLuminanceSource instance.
  - setOnTorchListener
```
public void setOnTorchListener(CameraManager.OnTorchListener listener)
```
    提供闪光灯监听
    
    参数:
    
    listener -
  - setOnSensorListener
```
public void setOnSensorListener(CameraManager.OnSensorListener listener)
```
    传感器光线照度监听
    
    参数:
    
    listener -
  - sensorChanged
```
public void sensorChanged(boolean tooDark,
                          float ambientLightLux)
```

类 CameraManager

嵌套类概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

构造器详细资料

CameraManager

方法详细资料

openDriver

isOpen

getOpenCamera

closeDriver

startPreview

stopPreview

setTorch

requestPreviewFrame

getFramingRect

getFramingRectInPreview

setFullScreenScan

setFramingRectRatio

setFramingRectVerticalOffset

setFramingRectHorizontalOffset

getCameraResolution

getScreenResolution

setManualCameraId

setManualFramingRect

buildLuminanceSource

setOnTorchListener

setOnSensorListener

sensorChanged