Android 指南针在不同手机上读取不同的值？
你好:)我正在开发一个应用程序，它使用指南针和位置在某个位置的方向上绘制箭头。我的问题是，当我在模拟器上运行代码时，所有箭头都指向正确的方向，并且当我将模拟器的方向更改为横向时，所有箭头仍然正确。但是，当我在 Nexus One 上运行相同的应用程序时，当手机垂直时，箭头都是正确的，但当手机横向时，所有箭头都会偏离 90 度。它保留手机的“顶部”作为对北的参考。因此，您必须根据手机的方向校正指南针。是否所有真机都会出现这种情况，而模拟器则不同？或者这只是 Nexus One？谢谢 ：）
Hello :) I am working on an application that uses the compass and location to draw an arrow at the direction of a location. My problem is when I run my code on the emulator, all the arrows point the correct directions, and when I change the orientation of the emulator to landscape, all the arrows are still correct. But when I run the same application on my Nexus One, the arrows are all correct when the phone is vertical, but when it turns to landscape all of the arrow are off by 90 degrees. It keeps the "top" of the phone as the reference to North. Thus you must correct the compass for the orientation of the phone. Does this happen on all real phones and the emulator is the different one? Or is this just the Nexus One? Thanks :)
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根据我的理解，指南针当前的工作方式应该始终使用手机的“顶部”或“默认方向”来正确读取。这在早期版本的 Android 上可能有所不同。据说，开发人员需要通过方向变化来补偿屏幕方向以代表真正的北方。对于加速度计来说也是如此，轴保持基于默认屏幕方向（因此对于大多数手机来说是纵向的，但平板电脑大多数是横向的）。
我不想向您推荐 sdk，但此链接第一段解释了：
http://developer.android.com/reference/android/hardware/SensorEvent.html
From my understanding the current way the compass works it is supposed to always use the "top" of the phone or "default orientation" for the correct reading. This could have been different on earlier versions of android. It is said it is then up to developers to compensate for the screen orientation to represent the true north with orientation changes. Same goes for the accelerometer the axis stay based off of default screen orientation (so for most phones portrait, but tablets most would be landscape).
I hate to refer you to the sdk but this link first paragraph explains:
http://developer.android.com/reference/android/hardware/SensorEvent.html