//根據當前介面顯示方向設定攝像頭預覽方向
public static int cameraDisplayOrientation(Activity activity, int cameraId) {
    android.hardware.Camera.CameraInfo info = new android.hardware.Camera.CameraInfo();
android.hardware.Camera.getCameraInfo(cameraId, info);
    int rotation = activity.getWindowManager().getDefaultDisplay()
            .getRotation();
 
    int degrees = 0;
    switch (rotation) {
        case Surface.ROTATION_0:
            degrees = 0;
            break;
        case Surface.ROTATION_90:
            degrees = 90;
            break;
        case Surface.ROTATION_180:
            degrees = 180;
            break;
        case Surface.ROTATION_270
 
:
            degrees = 270;
            break;
}

    int result;
    if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
        result = (info.orientation + degrees) % 360;
result = (360 - result) % 360;  } else {result = (info.orientation - degrees + 360) % 360;
}
    //返回需要旋轉的角度
    return result;
 
}