我发现，当我开始了我的游戏罗盘往往是不正常的。对象将飞来飞去，并没有在那里他们应该是。但是，如果我移动电话以8字形（或圆刚摇一摇随机方向）都锁定到位内或许半分钟。

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.

请问硬件知道什么时候罗盘未校准？有没有可能对我来说，检测到并弹出一条消息，告知用户你的Andr​​oid的指南针需要校准，请在水平八字形运动绕移动电话，直到此消息消失。

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."

推荐答案

在 SensorEventListener 有一个函数 onAccuracyChanged（传感器传感器，INT精度） 在其中您可以查看设备的磁力计的精度。有4级精度（从类的SensorManager ）：

In SensorEventListener there is a function onAccuracyChanged(Sensor sensor, int accuracy) in which you can check the accuracy of the device's magnetometer. There are 4 levels of accuracy (from class SensorManager):

SENSOR_STATUS_ACCURACY_HIGH = 3
SENSOR_STATUS_ACCURACY_MEDIUM = 2
SENSOR_STATUS_ACCURACY_LOW = 1
SENSOR_STATUS_UNRELIABLE = 0