RxCamera

RxJava style camera API for android, it based on android.hardware.camera

Add to your project dependence:

repositories {
        jcenter()
}
dependencies {
    compile 'com.ragnarok.rxcamera:lib:0.0.5'
}

Basic Usage:

set the camera parameter by choose a RxCameraConfig, which created by RxCameraConfig.Builder:

RxCameraConfig config = new RxCameraConfig.Builder()
            .useBackCamera()
            .setAutoFocus(true)
            .setPreferPreviewFrameRate(15, 30)
            .setPreferPreviewSize(new Point(640, 480), false)
            .setHandleSurfaceEvent(true)
            .build();

for all camera config currently support, please see RxCameraConfig

open camera
```
RxCamera.open(context, config)
```
it return an RxJava Observable object, the type is Observable<RxCamera>
bind a SurfaceView or TextureView and startPreview

since RxCamera.open is return an Observable, so you can chain the call like this
```
RxCamera.open(this, config).flatMap(new Func1<RxCamera, Observable<RxCamera>>() {
      @Override
      public Observable<RxCamera> call(RxCamera rxCamera) {
          return rxCamera.bindTexture(textureView);
          // or bind a SurfaceView:
          // rxCamera.bindSurface(SurfaceView)
      }
}).flatMap(new Func1<RxCamera, Observable<RxCamera>>() {
      @Override
      public Observable<RxCamera> call(RxCamera rxCamera) {
          return rxCamera.startPreview();
      }
});
```
both RxCamera.bindTexture and RxCamera.startPreview will return an Observable<RxCamera> object

PS: if set isHandleSurfaceEventto true(set by setHandleSurfaceEvent(true) in RxCameraConfigChooser), RxCamera will do the actual camera start preview action when the surface is available, otherwise it will start preview immediately, and may failed if surface is not available, in this case, the return Observable will call onError
switch camera

switch the camera in runtime
```
 camera.switchCamera(); 
```
and it will also change the internal camera config, so after switch camera, the camera.getConfig will return with new setting

request camera data

RxCamera support many styles of camera data requests:

successiveDataRequest
```
camera.request().successiveDataRequest()
```
it will return the camera data infinitely
periodicDataRequest
```
camera.request().periodicDataRequest(1000)
```
as the name, it will return camera data periodic, pass the interval in millisecond
oneShotRequest
```
camera.request().oneShotRequest()
```
it will return the camera data only once
takePictureRequest
```
camera.request().takePictureRequest(boolean isContinuePreview, Func shutterAction, boolean openFlash)
```
the encapsulation of takePicture API, if isContinuePreview set to true, the RxCamera will try to restart preview after capture the picture, otherwise will behave as system takePicture call, stop preview after captured successfully

and the shutterAction will called after picture just captured, like the [ShutterCallback] (http://developer.android.com/intl/es/reference/android/hardware/Camera.ShutterCallback.html) (actually it is called in the system shutterCallback)

and the openFlash if set to true, it will open the flash when taking picture, and automatically close it after this request
FaceDetectionRequest
```
camera.request().faceDetectionRequest()
```
the encapsulation of Camera.FaceDetectionListener, it will return the faces location in CameraData.faceList

All the data request will return an Observalbe<RxCameraData>

the RxCameraData contained these fields:

byte[] cameraData, the raw data of camera, for the takePicture request, it will return the jpeg encode byte, other request just return raw camera preview data, if you don't set preview format, the default is YUV420SP
- Matrix rotateMatrix, this matrix help you rotate the camera data in portrait
- Camera.Face[] faceList, the locatoin of faces, only returned in FaceDetectionRequest

camera action request

the camera action request will change the behavior of the camera

zoom and somoothZoom action:

camera.action().zoom(int level)
camera.action().smoothZoom(int level)

change the camera zoom level

open or close the flash

camera.action().flashAction(boolean isOn)

area focus and area metering

camera.action().areaFocusAction(List<Camera.Area> focusAreaList)
camera.action().areaMeterAction(List<Camera.Area> focusAreaList)

and there is a helper function to convert the coordinate to [-1000, 1000], which is suitable for Camera.Area, in CameraUtil:

Rect transferCameraAreaFromOuterSize(Point center, Point outerSize, int size)

check out the example to see how to use this

This project still in very early stage, and welcome the pull request