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class Preview extends ViewGroup implements SurfaceHolder.Callback {
	SurfaceView mSurfaceView;
	SurfaceHolder mHolder;

	Perview(Context context){
		super(context);

		mSurfaceView = new SurfaceView(context);
		addView(mSurfaceView);
		mHolder = mSurfaceView.getHolder();
        mHolder.addCallback(this);
        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
	}

}

public void setCamera(Camera camera) {
	if (mCamera == camera) { return; }

	stopPreviewAndFreeCamera();

	mCamera = camera;

	if (mCamera != null) {
		List<Size> localSizes = mCamera.getParameters().getSupportedPreviewSizes();
		mSupportedPreviewSizes = localSizes;
		requestLayout();

		try {
			mCamera.setPreviewDisplay(mHolder);
		} catch (IOException e) {
			e.printStackTrace();
		}
		mCamera.startPreview();
	}
}
// 修改相机设置
public void surfaceChanged(SurfaceHolder holder,int format,int w,int h) {
	Camera.Parameters parameters = mCamera.getParameters();
	parameters.setPreviewSize(mPreviewSize.with,mPreviewSize.height);
	requestLayout();
	mCamera.setParameters(parameters);
	mCamera.startPreview();
}
// 设置预览方向 setCameraDisplayOrientation()方法 Android Api level 14之前 必须先体质预览

// 拍摄照片
Camera.takePicture()拍下图片
创建Camera.PictureCallback与Camera.ShutterCallback 对象并传递到Camera.takePocture()中
如果想做连拍动作，可以创建一个Camera.PreviewCallback并实现onPerviewFrame()
// 停止预览并释放相机
public void surfaceDestroyed(SurfaceHolder holder) {
	if (mCamera != null) {
		mCamera.stopPreview();
	}
}
public void stopPreviewAndFreeCamera() {
	if (mCamera != null) {
		mCamera.stopPreview();
		mCamera.release();
		mCamera = null;
	}
}
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