Android Camera实现毫秒级拍照实例

概述我们知道自定义Camera需要以下几步打开相机，即实例化Camera对象，Cameracamera=Camera.open();

我们知道自定义Camera需要以下几步

打开相机，即实例化Camera对象，Camera camera = Camera.open(); 设置Camera的相关参数，Camera.Parameters parameters = camera.getParameters(); 打开预览，camera.setPrevIEwdisplay(surfaceholder); camera.startPrevIEw(); 获取图片，这里只是从预览中获取因此使用，camera.setPrevIEwCallback(new Camera.PrevIEwCallback(){……..}); 停止预览，释放相机，camera.stopPrevIEw();camera.release();

1、打开相机

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;  }

2、设置相关参数和预览

//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);

3、获取图片

 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,size.height),80,stream);            Bitmap bmp = BitmapFactory.decodeByteArray(stream.toByteArray(),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());        }      }    });  }

旋转图片的方法

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,bmp.getWIDth(),bmp.getHeight(),matrix,true);    imageVIEw.setimageBitmap(nbmp);  };

自定义时间拍照

  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 ;      }    }  };

然后点击按钮调用

mHandler.sendEmptyMessageDelayed(101,100);

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