我已经看过了几个帖子就改变了相机与面视图的方向，但我已经把我的code从例子中的：

I have looked up a few posts on changing the orientation of the camera with a surface view, but I have taken my code from the examples at:

http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/graphics/Camera$p$pview.html

这提供了尺寸的功能看起来像这样...

The function that provides the dimensions looks like this...

    private Size getOptimalPreviewSize(List<Size> sizes, int w, int h) {
        final double ASPECT_TOLERANCE = 0.1;
        double targetRatio = (double) w / h;
        if (sizes == null) return null;

        Size optimalSize = null;
        double minDiff = Double.MAX_VALUE;

        int targetHeight = h;

        // Try to find an size match aspect ratio and size
        for (Size size : sizes) {
            double ratio = (double) size.width / size.height;
            if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue;
            if (Math.abs(size.height - targetHeight) < minDiff) {
                optimalSize = size;
                minDiff = Math.abs(size.height - targetHeight);
            }
        }

        // Cannot find the one match the aspect ratio, ignore the requirement
        if (optimalSize == null) {
            minDiff = Double.MAX_VALUE;
            for (Size size : sizes) {
                if (Math.abs(size.height - targetHeight) < minDiff) {
                    optimalSize = size;
                    minDiff = Math.abs(size.height - targetHeight);
                }
            }
        }
        return optimalSize;
    }

我的问题是，当我改变设备的方向，preVIEW照片在景观。我试着设置了摄像头的方向，但是这导致非常奇怪的结果。有谁知道我需要改变有这个运转正常？

My problem is that when I change the orientation of the device, the preview picture stays landscape. I tried setting the orientation of the camera but this resulted in very strange results. Does anyone know what I need to change to have this rotate properly?

推荐答案

在code正确地调整摄像头preVIEW定位是一个有点复杂，因为它要考虑到

The code to correctly adjust the camera preview orientation is a bit complex, since it has to take into account

的文档Camera.setDisplayOrientation对如何正确处理这个样品code。我复制在这里：

The documentation for Camera.setDisplayOrientation has sample code on how to deal with this correctly. I'm reproducing it here:

public static void setCameraDisplayOrientation(Activity activity,
     int cameraId, android.hardware.Camera camera) {

   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;  // compensate the mirror
   } else {  // back-facing
       result = (info.orientation - degrees + 360) % 360;
   }
   camera.setDisplayOrientation(result);
}

调用此之后，你的UI已经绘（onSurfaceChanged将工作作为一项指标），或者该设备的用户界面旋转（onConfigurationChanged将工作作为一项指标）。

Call this after your UI has been drawn (onSurfaceChanged would work as an indicator) or the device UI rotates (onConfigurationChanged would work as an indicator).