谷歌纸板VR传感器 [英] Google Cardboard VR sensors

问题描述

我使用的谷歌纸板的（其头部跟踪类）来检测有关设备的旋转某些事情在AR应用。它工作得很好。

I'm using the Google Cardboard (its HeadTracker class) to detect certain things about device rotation in an AR application. It works very well.

然而，在某些设备上，它不工作（没有任何反应）。我想这是因为他们没有必要的传感器。我的问题：

However, on some devices, it doesn't work (nothing happens). I assume this is because they don't have the necessary sensors. My questions:

1）欲在运行时检测当前设备是否支持头部跟踪，即它具有必要的传感器提供。对于这一点，我需要知道哪些传感器所使用的头部跟踪，这样我可以查询，如果这些传感器是present。什么是这些传感器？

1) I want to detect at runtime whether the current device supports the HeadTracker, i.e. it has the necessary sensors available. For this, I need to know which sensors are used by HeadTracker, so that I can query if those sensors are present. What are these sensors?

2）有没有一种方法来指定AndroidManifest上必要的传感器？据我所看到的，也没有办法。因此，如果用户下载我的应用程序，应用程序将必须通知在运行时不支持他的设备的用户。这是不是很好。有什么想法？

2) Is there a way to specify the necessary sensors in AndroidManifest? As far as I can see, there is no way. Therefore, if a user downloads my app, the app will have to inform the user at runtime that his device is not supported. This is not nice. Any thoughts?

推荐答案

谷歌纸板的网站上有一个装置兼容性列表： 这似乎有点不完整的，所以我想考虑看看到Cardboard.jar的<一个href="https://github.com/Zomega/Cardboard/blob/master/src/com/google/vrtoolkit/cardboard/sensors/HeadTracker.java">source code 。 HeadTracker.java似乎有以下逻辑：

Google cardboard's website has a device compatibility list: It seems somewhat incomplete, so I tried taking a look into Cardboard.jar's source code. HeadTracker.java seems to have the following logic:

SensorManager sensorManager = (SensorManager)HeadTracker.this.mContext.getSystemService("sensor");

for (int sensorType : HeadTracker.INPUT_SENSORS) {
  Sensor sensor = sensorManager.getDefaultSensor(sensorType);
  sensorManager.registerListener(HeadTracker.this.mSensorEventListener, sensor, 0, handler);
}

使用在同一文件中定义为

With INPUT_SENSORS defined in the same file as

{TYPE_ACCELEROMETER，TYPE_GYROSCOPE};

{TYPE_ACCELEROMETER, TYPE_GYROSCOPE};

我不知道，如果头部跟踪可在手机上正常工作，只有其中的一个传感器。我的猜测是，两者都是必要的。

I'm not sure if HeadTracker can work on phones with only one of those sensors. My guess is that both are necessary.

您的应用程序可能需要一定的审查才能运行（甚至可以看到在Android Market上）与你的清单下面几行：

your app can require certain censors in order to run (or even be visible on the android market) with the following lines in your manifest:

<uses-feature android:name="android.hardware.sensor.accelerometer" android:required="true" />
<uses-feature android:name="android.hardware.sensor.gyroscope" android:required="true" />

您还可以检查传感器可为您的应用程序在运行时使用的SensorManager的 公共传感器getDefaultSensor（整型）的功能。

you can also check if the sensors are available to your app at runtime using SensorManager's public Sensor getDefaultSensor (int type) function.

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