Android编程中调用Camera时预览画面有旋转问题的解决方法

public static int getDisplayRotation(Activity activity) {  int rotation = activity.getWindowManager().getDefaultDisplay()    .getRotation();  switch (rotation) {    case Surface.ROTATION_0: return 0;    case Surface.ROTATION_90: return 90;    case Surface.ROTATION_180: return 180;    case Surface.ROTATION_270: return 270;  }  return 0;}public static void setCameraDisplayOrientation(Activity activity,    int cameraId, Camera camera) {  // See android.hardware.Camera.setCameraDisplayOrientation for  // documentation.  Camera.CameraInfo info = new Camera.CameraInfo();  Camera.getCameraInfo(cameraId, info);  int degrees = getDisplayRotation(activity);  int result;  if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {    result = (info.orientation + degrees) % 360;    result = (360 - result) % 360; // compensate the mirror  } else { // back-facing    result = (info.orientation - degrees + 360) % 360;  }  camera.setDisplayOrientation(result);}