摘要：
与Camera类Camera相关的几个流方法。open（cameraId）打开照相机照相机。setDisplayOrientation（0）设置相机水平方向mCamera。setPreviewDisplay（holder）在SurfaceHolder mCamera上显示图片。setPreviewCallback（callback）设置回调，并将Yuv数据传输到onPreviewFrame方法
Camera相机类相关的几个流程方法
Camera.open(cameraId) 打开相机
camera.setDisplayOrientation(0) 设置相机水平方向
mCamera.setPreviewDisplay(holder) 在SurfaceHolder上显示画面
mCamera.setPreviewCallback(callback) 设置回调，将Yuv数据传递到onPreviewFrame方法
previewRate mParams = mCamera.getParameters() 获取相机相关参数
mCamera.stopPreview() 停止预览
mCamera.release() 释放相机
实现Camera.PreviewCallback接口获取Yuv视频流
@Override public void onPreviewFrame(byte[] bytes, Camera camera) { //获取实时的Yuv数据流 }
实现Camera.PictureCallback接口实现拍照
private Camera.PictureCallback mPictureCallback = new Camera.PictureCallback() { @Override public void onPictureTaken(byte[] data, Camera camera) { String pictureDir = Environment.getExternalStorageDirectory() + File.separator +"Videocmo/images"; String pictureName = DateFormat.format("yyyyMMddHHmmss",new Date()).toString()+ ".jpg"; String path=pictureDir+ File.separator + pictureName; try { File file = new File(pictureDir); if (!file.exists()) { file.mkdirs(); } FileOutputStream fos = new FileOutputStream(path); fos.write(data); fos.close(); } catch (FileNotFoundException ignored) { } catch (IOException ignored) { } } };
mCamera.takePicture(null, null, mPictureCallback);
寻找相机
private int findCamera(boolean isfront) { int cameraCount = 0; Camera.CameraInfo cameraInfo = new Camera.CameraInfo(); cameraCount = Camera.getNumberOfCameras(); for (int camIdx = 0; camIdx < cameraCount; camIdx++) { Camera.getCameraInfo(camIdx, cameraInfo); if (isfront) { // CAMERA_FACING_FRONT前置 if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) { return camIdx; } } else { // CAMERA_FACING_BACK后置 if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) { return camIdx; } } } return -1; }
Camera.Parameters相机参数类
Camera.Parameters parameters = camera.getParameters(); //获取相机参数
List<Size> supportedPreviewSizes = parameters.getSupportedPreviewSizes(); //获取摄像头支持的各种分辨率
parameters.setPictureFormat(PixelFormat.JPEG);//设置照片格式
parameters.setPreviewSize(witdh,height); //设置预览尺寸
parameters.setPictureSize（witdh,height); //设置分辨率
camera.setParameters(parameters);//提交相机参数
设置相机分辨率
private void initCamera(Camera mCamera){ if(mCamera != null){ try{ mParams = mCamera.getParameters(); Size previewSize = CamParaUtil.getInstance().getPropPreviewSize(mParams.getSupportedPreviewSizes(),1.333f, 640); Log.d("log", String.valueOf(previewSize.width) + "-" + previewSize.height); pWidth = previewSize.width; pHeight = previewSize.height; mParams.setPreviewSize(pWidth, pHeight); List<String> focusModes = mParams.getSupportedFocusModes(); if(focusModes.contains("continuous-video")){ mParams.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO); } mCamera.setParameters(mParams); mCamera.startPreview(); isPreviewing = true; mPreviwRate = previewRate; }catch (Exception ex){ ex.printStackTrace(); } } } public Size getPropPreviewSize(List<Size> list, float th, int minWidth){ Collections.sort(list, sizeComparator); int i = 0; for(Size s:list){ if((s.width >= minWidth) && equalRate(s, th)){ break; } i++; } if(i == list.size()){ } return list.get(i); }