Android中使用Camera

来源：互联网发布：大数据相关研究课题编辑：程序博客网时间：2024/05/17 03:19
1.使用surfaceView来预览。
2.调用Camera来设置相机。
3.设置camera的参数。
看下面的例子：
 //设置surfaceView不需要自己维护缓冲区    surfaceView_image_show.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);    //获取surfaceView的SurfaceHolder    surfaceHolder = surfaceView_image_show.getHolder();    //为surfaceHolder添加一个回调监听器    surfaceHolder.addCallback(new SurfaceHolder.Callback() {        @Override        public void surfaceCreated(SurfaceHolder holder) {            initCamera();        }        @Override        public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {        }        @Override        public void surfaceDestroyed(SurfaceHolder holder) {            //如果camera不为空，释放摄像头            if(camera != null){                if(isPreview){                    camera.stopPreview();                }                camera.release();                camera = null;            }        }    });}//初始化摄像头private void initCamera(){    //如果没有预览    if(!isPreview){        camera = Camera.open(0);//打开后置摄像头        camera.setDisplayOrientation(90);    }    if(camera != null && !isPreview){        //设置Camera的参数        Camera.Parameters parameters = camera.getParameters();        parameters.setPreviewSize(screenWidth,screenHeight);//设置预览照片大小        parameters.setPreviewFpsRange(4, 10);//预览照片每秒显示多少帧的最小值和最大值        parameters.setPreviewFormat(ImageFormat.JPEG);//设置图片格式        parameters.set("jpeg-quality", 85);//设置JPG照片的质量        parameters.setPictureSize(screenWidth, screenHeight);//设置图片大小        try {            camera.setPreviewDisplay(surfaceHolder);//通过SurfaceView显示取景画面        } catch (IOException e) {            e.printStackTrace();        }        camera.startPreview();//开始预览        isPreview = true;    }}//控制摄像头自动对焦public void capture(View view){    if(camera != null){        //控制摄像头自动对焦后才拍照        camera.autoFocus(new Camera.AutoFocusCallback() {            @Override            public void onAutoFocus(boolean success, Camera camera) {                if(!success){                    camera.takePicture(new Camera.ShutterCallback() {                        @Override                        public void onShutter() {                            //按下快门会执行此处代码                        }                    }, new Camera.PictureCallback() {                        @Override                        public void onPictureTaken(byte[] data, Camera camera) {                            //此处代码可以决定是否需要保存原始照片信息                        }                    }, new Camera.PictureCallback() {                        @Override                        public void onPictureTaken(byte[] data, Camera camera) {                            //根据拍照所取得的数据创建位图                            final Bitmap bm = BitmapFactory.decodeByteArray(data, 0, data.length);                            View view =  getLayoutInflater().inflate(R.layout.save_camera_img, null);                            ImageView camera_img = (ImageView)view.findViewById(R.id.ImageView_camera_showimg);                            camera_img.setImageBitmap(bm);                            AlertDialog.Builder dialog = new AlertDialog.Builder(CameraActivity.this)                                    .setView(view)                                    .setNegativeButton("取消", null)                                    .setPositiveButton("确定", new DialogInterface.OnClickListener() {                                        @Override                                        public void onClick(DialogInterface dialog, int which) {                                            //跳转到图片编辑界面，并将该Bitmap对象传过去                                            File file = new File(Environment.getExternalStorageDirectory(),                                                    UUID.randomUUID().toString()+".jpg");                                            try {                                                FileOutputStream fos = new FileOutputStream(file);                                                bm.compress(Bitmap.CompressFormat.JPEG,100,fos);                                                fos.close();                                            } catch (FileNotFoundException e) {                                                e.printStackTrace();                                            } catch (IOException e) {                                                e.printStackTrace();                                            }                                            Intent intent = new Intent(CameraActivity.this, EditCameraImgActivity.class);                                            intent.putExtra("cameraImgPath",file.getAbsolutePath());                                            CameraActivity.this.startActivity(intent);                                            CameraActivity.this.finish();                                        }                                    });                            dialog.create().show();                            camera.stopPreview();                            camera.startPreview();                            isPreview  = true;                        }                    });                }            }        });    }}
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