Android中調用網路攝影機預覽

 

Android中調用網路攝影機預覽的步驟如下：

1.SurfaceView相關

    //定義對象    private SurfaceView photoView;     // SurfaceView對象：(視圖組件)視頻顯示    private SurfaceHolder photoHolder; // SurfaceHolder對象：(抽象介面)SurfaceView支援類     private Camera camera;         // Camera對象，相機預覽

//SurfaceView對象的設定        photoHolder=photoView.getHolder(); // 綁定SurfaceView，取得SurfaceHolder對象        photoHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);  //設定顯示器類型        photoHolder.setFixedSize(100, 100);        photoHolder.addCallback(callback); // SurfaceHolder加入回調介面

2. 實現SurfaceHolder.Callback介面的實現

    SurfaceHolder.Callback callback=new SurfaceHolder.Callback() {                @Override        public void surfaceDestroyed(SurfaceHolder holder) {            // TODO Auto-generated method stub            camera.setPreviewCallback(null);            camera.stopPreview();            camera.release();            camera=null;        }                @Override        public void surfaceCreated(SurfaceHolder holder) {            // TODO Auto-generated method stub            camera=Camera.open();            try {                camera.setPreviewDisplay(photoHolder);            } catch (IOException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }        }        @Override        public void surfaceChanged(SurfaceHolder holder, int format, int width,                int height) {            // TODO Auto-generated method stub            initCamera();        }    };

3.Camera屬性的設定

    //網路攝影機屬性的設定    public void initCamera(){        Camera.Parameters parameters=camera.getParameters();   //得到網路攝影機屬性        camera.setDisplayOrientation(90);   //旋轉90度（不設定時，會橫向顯示）        camera.setParameters(parameters);  //將屬性值儲存至Camera的參數中    }