在 Android 中，我可以以编程方式检测指南针尚未校准吗？
我发现当我启动游戏时，指南针经常失灵。物体会飞来飞去，而不是在它们应该在的地方。但是，如果我以 8 字形移动手机（或者只是以随机方向挥动手机），一切都会在大约半分钟内卡入到位。
硬件是否知道指南针何时未校准？我是否可以检测到这一点并弹出一条消息，告诉用户“您的 Android 指南针需要校准。请以水平 8 字形运动移动手机，直到该消息消失。”
I've found that when I start up my game the compass is often out of whack. Objects will fly around and not be where they're supposed to be. But, if I move the phone in a figure eight (or just wave it round in random directions) everything snaps into place within perhaps half a minute.
Does the hardware know when the compass is not calibrated? Would it be possible for me to detect this and pop up a message telling the user "Your android's compass needs to be calibrated. Please move the phone around in a horizontal figure eight motion until this message goes away."
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