android高级技术之相机（一）：http://blog.csdn.net/program008/article/details/50557296
前面的分享中我们学习了相机的基本属性，包括相机的预览属性，拍照，保存相片，旋转相片等，今天我们来看下关于相机的前后摄像头的切换：
在之前的代码中做稍微的更改即可实现摄像头的切换：
一、获取相机信息，得到前置摄像头和后置摄像头的编号：
[java] view plain copy print ? protected void getCameraInfo(){ Camera.CameraInfo cameraInfo = new Camera.CameraInfo(); iCameraCnt = Camera.getNumberOfCameras(); for (int i = 0; i < iCameraCnt; i++) { Camera.getCameraInfo(i,cameraInfo); if(cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT){ iFontCameraIndex = i; } else if(cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK){ iBackCameraIndex = i; } } } protected void getCameraInfo(){ Camera.CameraInfo cameraInfo = new Camera.CameraInfo(); iCameraCnt = Camera.getNumberOfCameras(); for (int i = 0; i < iCameraCnt; i++) { Camera.getCameraInfo(i,cameraInfo); if(cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT){ iFontCameraIndex = i; } else if(cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK){ iBackCameraIndex = i; } } } 二、surfaceCreated回调时，开始打开后面的摄像头，并标示好 [java] view plain copy print ? @Override public void surfaceCreated(SurfaceHolder holder) { getCameraInfo(); mCamera = Camera.open(iBackCameraIndex); bBack = true; try { setCamera(); mCamera.setPreviewDisplay(holder); mCamera.startPreview(); } catch (IOException e) { e.printStackTrace(); } } @Override public void surfaceCreated(SurfaceHolder holder) { getCameraInfo(); mCamera = Camera.open(iBackCameraIndex); bBack = true; try { setCamera(); mCamera.setPreviewDisplay(holder); mCamera.startPreview(); } catch (IOException e) { e.printStackTrace(); } } 三、点击切换摄像头时： [java] view plain copy print ? public void onChange(View view) { if (mCamera != null) { mCamera.release(); mCamera = null; } if (bBack){ mCamera = Camera.open(iFontCameraIndex); setCamera(); try { mCamera.setPreviewDisplay(mSfPreview.getHolder()); } catch (IOException e) { e.printStackTrace(); } mCamera.startPreview(); bBack = false; } else{ mCamera = Camera.open(iBackCameraIndex); setCamera(); try { mCamera.setPreviewDisplay(mSfPreview.getHolder()); } catch (IOException e) { e.printStackTrace(); } mCamera.startPreview(); bBack = true; } } public void onChange(View view) { if (mCamera != null) { mCamera.release(); mCamera = null; } if (bBack){ mCamera = Camera.open(iFontCameraIndex); setCamera(); try { mCamera.setPreviewDisplay(mSfPreview.getHolder()); } catch (IOException e) { e.printStackTrace(); } mCamera.startPreview(); bBack = false; } else{ mCamera = Camera.open(iBackCameraIndex); setCamera(); try { mCamera.setPreviewDisplay(mSfPreview.getHolder()); } catch (IOException e) { e.printStackTrace(); } mCamera.startPreview(); bBack = true; } }学习上面的代码需要结合上期的相机的开发步骤一起学习，地址链接： http://blog.csdn.net/program008/article/details/50557296