// 定义对象 private SurfaceView mSurfaceview = null;  // SurfaceView对象：(视图组件)视频显示  private SurfaceHolder mSurfaceHolder = null;  // SurfaceHolder对象：(抽象接口)SurfaceView支持类  private Camera mCamera =null;     // Camera对象，相机预览

 // InitSurfaceView private void initSurfaceView() {  mSurfaceview = (SurfaceView) this.findViewById(R.id.Surfaceview);  mSurfaceHolder = mSurfaceview.getHolder(); // 绑定SurfaceView，取得SurfaceHolder对象  mSurfaceHolder.addCallback(mainActivity.this); // SurfaceHolder加入回调接口  // mSurfaceHolder.setFixedSize(176, 144); // 预览大小設置  mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);// 設置顯示器類型，setType必须设置 }

/*【SurfaceHolder.Callback 回调函数】*/ public void surfaceCreated(SurfaceHolder holder) // SurfaceView启动时/初次实例化，预览界面被创建时，该方法被调用。 {  // TODO Auto-generated method stub    mCamera = Camera.open();// 开启摄像头（2.3版本后支持多摄像头,需传入参数）   try  {      Log.i(TAG, "SurfaceHolder.Callback：surface Created");   mCamera.setPreviewDisplay(mSurfaceHolder);//set the surface to be used for live preview

  } catch (Exception ex)  {   if(null != mCamera)   {    mCamera.release();    mCamera = null;        }   Log.i(TAG+"initCamera", ex.getMessage());  } } public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) // 当SurfaceView/预览界面的格式和大小发生改变时，该方法被调用 {  // TODO Auto-generated method stub    Log.i(TAG, "SurfaceHolder.Callback：Surface Changed");  //mPreviewHeight = height;  //mPreviewWidth = width;  initCamera();   } public void surfaceDestroyed(SurfaceHolder holder)  // SurfaceView销毁时，该方法被调用 {  // TODO Auto-generated method stub  Log.i(TAG, "SurfaceHolder.Callback：Surface Destroyed");  if(null != mCamera)  {   mCamera.setPreviewCallback(null); //！！这个必须在前，不然退出出错   mCamera.stopPreview();    bIfPreview = false;    mCamera.release();   mCamera = null;       } }

 1 /*【2】【相机预览】*/ 2  private void initCamera()//surfaceChanged中调用 3  { 4   Log.i(TAG, "going into initCamera"); 5   if (bIfPreview) 6   { 7    mCamera.stopPreview();//stopCamera(); 8   } 9   if(null != mCamera)10   {11    try12    {13     /* Camera Service settings*/    14     Camera.Parameters parameters = mCamera.getParameters();15     // parameters.setFlashMode("off"); // 无闪光灯16     parameters.setPictureFormat(PixelFormat.JPEG); //Sets the image format for picture 设定相片格式为JPEG，默认为NV21    17     parameters.setPreviewFormat(PixelFormat.YCbCr_420_SP); //Sets the image format for preview picture，默认为NV2118     /*【ImageFormat】JPEG/NV16(YCrCb format，used for Video)/NV21(YCrCb format，used for Image)/RGB_565/YUY2/YU12*/19     20     // 【调试】获取caera支持的PictrueSize，看看能否设置？？21     List<Size> pictureSizes = mCamera.getParameters().getSupportedPictureSizes();22     List<Size> previewSizes = mCamera.getParameters().getSupportedPreviewSizes();23     List<Integer> previewFormats = mCamera.getParameters().getSupportedPreviewFormats();24     List<Integer> previewFrameRates = mCamera.getParameters().getSupportedPreviewFrameRates();25     Log.i(TAG+"initCamera", "cyy support parameters is ");26     Size psize = null;27     for (int i = 0; i < pictureSizes.size(); i++)28     {29      psize = pictureSizes.get(i);30      Log.i(TAG+"initCamera", "PictrueSize,width: " + psize.width + " height" + psize.height);31     }32     for (int i = 0; i < previewSizes.size(); i++)33     {34      psize = previewSizes.get(i);35      Log.i(TAG+"initCamera", "PreviewSize,width: " + psize.width + " height" + psize.height);36     }37     Integer pf = null;38     for (int i = 0; i < previewFormats.size(); i++)39     {40      pf = previewFormats.get(i);41      Log.i(TAG+"initCamera", "previewformates:" + pf);42     }43     44     // 设置拍照和预览图片大小45     parameters.setPictureSize(640, 480); //指定拍照图片的大小46     parameters.setPreviewSize(mPreviewWidth, mPreviewHeight); // 指定preview的大小 47 //这两个属性 如果这两个属性设置的和真实手机的不一样时，就会报错48     49 // 横竖屏镜头自动调整50     if (this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) 51     {52      parameters.set("orientation", "portrait"); //53      parameters.set("rotation", 90); // 镜头角度转90度（默认摄像头是横拍） 54      mCamera.setDisplayOrientation(90); // 在2.2以上可以使用55     } else// 如果是横屏56     {57      parameters.set("orientation", "landscape"); //58      mCamera.setDisplayOrientation(0); // 在2.2以上可以使用59     } 60     61     /* 视频流编码处理 */ 62     //添加对视频流处理函数63     64     65 // 设定配置参数并开启预览66     mCamera.setParameters(parameters); // 将Camera.Parameters设定予Camera    67     mCamera.startPreview(); // 打开预览画面68     bIfPreview = true;69     70     // 【调试】设置后的图片大小和预览大小以及帧率71     Camera.Size csize = mCamera.getParameters().getPreviewSize();72     mPreviewHeight = csize.height; //73     mPreviewWidth = csize.width;74     Log.i(TAG+"initCamera", "after setting, previewSize:width: " + csize.width + " height: " + csize.height);75     csize = mCamera.getParameters().getPictureSize();76     Log.i(TAG+"initCamera", "after setting, pictruesize:width: " + csize.width + " height: " + csize.height);77     Log.i(TAG+"initCamera", "after setting, previewformate is " + mCamera.getParameters().getPreviewFormat());78     Log.i(TAG+"initCamera", "after setting, previewframetate is " + mCamera.getParameters().getPreviewFrameRate());79    } catch (Exception e)80    { 81     e.printStackTrace();82    }83   }84  }

 1  // 【获取视频预览帧的接口】 2   mJpegPreviewCallback = new Camera.PreviewCallback() 3   { 4    @Override 5    public void onPreviewFrame(byte[] data, Camera camera)  6    { 7     //传递进来的data,默认是YUV420SP的 8 // TODO Auto-generated method stub     9     try10     {11      Log.i(TAG, "going into onPreviewFrame");12      //mYUV420sp = data;   // 获取原生的YUV420SP数据13      YUVIMGLEN = data.length;14      15      // 拷贝原生yuv420sp数据16      mYuvBufferlock.acquire();17      System.arraycopy(data, 0, mYUV420SPSendBuffer, 0, data.length);18      //System.arraycopy(data, 0, mWrtieBuffer, 0, data.length);19      mYuvBufferlock.release();20      21      // 开启编码线程，如开启PEG编码方式线程22      mSendThread1.start();23      24     } catch (Exception e)25     {26      Log.v("System.out", e.toString());27     }// endtry    28    }// endonPriview  29   };