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:
- 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
- @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:
- 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