Android Camera实现毫秒级拍照实例

public static Camera openFacingBackCamera() {    Camera cam = null;    Camera.CameraInfo cameraInfo = new Camera.CameraInfo();    for (int camIdx = 0, cameraCount = Camera.getNumberOfCameras(); camIdx < cameraCount; camIdx++) {      Camera.getCameraInfo(camIdx, cameraInfo);      if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {        try {          //打开相应的摄像头，目前是前置摄像头          cam = Camera.open(camIdx);        } catch (RuntimeException e) {          e.printStackTrace();          if (cam!=null){            cam.stopPreview();            cam.release();          }          cam = null;        }      }    }    return cam;  }

//定义SurfaceViewprivate SurfaceView localSurface; // 为surfaceHolder添加一个回调监听器    localSurface.getHolder().addCallback(new SurfaceHolder.Callback() {      @Override      public void surfaceCreated(SurfaceHolder holder) {      }      @Override      public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {        camera = CameraUtil.openFacingBackCamera();        //设置相机预览旋转角度        camera.setDisplayOrientation(180);        if (camera != null) {          Camera.Parameters parameters = camera.getParameters();// 获得相机参数          List<Camera.Size> sizes = parameters.getSupportedPreviewSizes();          List<Camera.Size> sizes_pic = parameters.getSupportedPictureSizes();          Camera.Size cs = sizes.get(0);          int mWidth = cs.width;          int mHeight = cs.height;          parameters.setPreviewSize(mWidth, mHeight);          parameters.setPictureSize(sizes_pic.get(0).width, sizes_pic.get(0).height);          parameters.setJpegQuality(85);//          parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);          parameters.setPictureFormat(ImageFormat.JPEG);          camera.setParameters(parameters);          try {            camera.setPreviewDisplay(localSurface.getHolder());            camera.startPreview(); // 开始预览            camera.autoFocus(null); // 自动对焦          } catch (IOException e) {            e.printStackTrace();            camera.stopPreview();            camera.release();            camera = null;          }        }      }      @Override      public void surfaceDestroyed(SurfaceHolder holder) {        if (camera!=null){          camera.stopPreview();          camera.release();          camera = null;        }      }    } );    // 设置该SurfaceView自己不维护缓冲    localSurface.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

 private void getViewImage() {   //设置监听    camera.setPreviewCallback(new Camera.PreviewCallback(){      @Override      public void onPreviewFrame(byte[] data, Camera camera) {        Camera.Size size = camera.getParameters().getPreviewSize();        try{          YuvImage image = new YuvImage(data, ImageFormat.NV21, size.width, size.height, null);          if(image!=null){            ByteArrayOutputStream stream = new ByteArrayOutputStream();            image.compressToJpeg(new Rect(0, 0, size.width, size.height), 80, stream);            Bitmap bmp = BitmapFactory.decodeByteArray(stream.toByteArray(), 0, stream.size());            //因为图片会放生旋转，因此要对图片进行旋转到和手机在一个方向上            rotateBitmap(bmp);            stream.close();          }        }catch(Exception ex){          Log.e("Sys","Error:"+ex.getMessage());        }      }    });  }

public void rotateMyBitmap(Bitmap bmp){    Matrix matrix = new Matrix();    matrix.postScale(-1, 1); // 镜像水平翻转(如果左右颠倒)    matrix.postRotate(180);    Bitmap nbmp = Bitmap.createBitmap(bmp, 0,0, bmp.getWidth(), bmp.getHeight(), matrix, true);    imageView.setImageBitmap(nbmp);  };

  private Handler mHandler = new Handler() {    public void handleMessage(Message msg) {      switch (msg.what) {        case 101:          getViewImage();          Log.e(TAG, "handleMessage: 拍照" );          mHandler.sendEmptyMessageDelayed(102, 100);          break;        case 102:          camera.setPreviewCallback(null);          break ;      }    }  };

mHandler.sendEmptyMessageDelayed(101, 100);