Nexus 5X保护反向景观传感器固定在机器人摄像头preVIEW应用 [英] Nexus 5x reverse landscape sensor fix in a android camera preview app

问题描述

我在那种Android开发新手，所以我的道歉提前如果我的问题是微不足道的。在我的应用程序的一部分，我需要我的后置摄像头的实况preVIEW，所以我创建延伸SurfaceView和实施SurfaceHolder.Callback（我基本上遵循了Android文档中的说明）的自定义类。

I am kind of newbie in Android development, so my apologies in advance if my question is trivial. In one part of my app I need a live preview of my rear camera, so I created a custom class which extends SurfaceView and implement SurfaceHolder.Callback (I followed basically the instructions in the android documentation).

不幸的是，我在一台Nexus 5倍，这是我刚刚意识到，它已经安装上逆向相机传感器测试我的应用程序。出于这个原因，我的应用程序对我的Nexus 5倍运行时，相机preVIEW出现倒挂，这是我不想。

Unfortunately, I am testing my app in a Nexus 5x, which I've just realized that it has installed the camera sensor in a reverse way. For that reason, the camera preview of my app when running on my Nexus 5x appears upside down, which is something I dont want.

如此看来，新android.hardware.camera2 API能自动处理这个问题。最终，我会同时使用旧相机API需要更新我的code。使用这种新的API，但现在我需要的是一个快速解决。

It seems that the new android.hardware.camera2 API is able to handle this issue automatically. Eventually I'll need to update all my code using this new API, but for now what I need is a quick fix while using the old camera API.

所以我读了那里，我发现了一张code，我需要在SurfaceChanged方法引入到解决此问题。在这里，它是：

So I was reading out there and I found a piece of code that I would need to introduce in the SurfaceChanged method to workaround this issue. Here it is:

Display display = ((WindowManager)getContext().getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();

        if(display.getRotation() == Surface.ROTATION_0)
        {
            parameters.setPreviewSize(capHeight, capWidth);                           
            camera.setDisplayOrientation(90);
        }

        if(display.getRotation() == Surface.ROTATION_90)
        {
            parameters.setPreviewSize(capWidth, capHeight);                           
        }

        if(display.getRotation() == Surface.ROTATION_180)
        {
            parameters.setPreviewSize(capHeight, capWidth);               
        }

        if(display.getRotation() == Surface.ROTATION_270)
        {
            parameters.setPreviewSize(capWidth, capHeight);
            camera.setDisplayOrientation(180);
        }

        camera.setParameters(parameters);*/

        camera.startPreview();

问题是，我没有看到的东西已经改变了。

The problem is that I don't see that something has changed.

有什么想法？

推荐答案

5倍的相机是不是反转;它在报告其参数正确的摄像机方向，所以不需要特殊的解决办法，只是要确保你正确设置显示方向：

The 5X camera is not "reverse"; it does report the correct camera orientation in its parameters, so no special workarounds are needed, just make sure you're setting the display orientation correctly:

 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);
}

从<一个href=\"http://developer.android.com/reference/android/hardware/Camera.html#setDisplayOrientation%28int%29\" rel=\"nofollow\">http://developer.android.com/reference/android/hardware/Camera.html#setDisplayOrientation%28int%29

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