关于Android中指南针的实现，我们可以使用传感器来获取设备的方向信息，从而实现指南针功能。

 	@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);accelerometer = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);magnetometer = sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);sensorManager.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_UI);sensorManager.registerListener(this, magnetometer, SensorManager.SENSOR_DELAY_UI);}@Overrideprotected void onDestroy() {super.onDestroy();sensorManager.unregisterListener(this);}@Overridepublic void onSensorChanged(SensorEvent event) {if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {accelerometerValues = event.values;} else if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD) {magnetometerValues = event.values;}float[] rotationMatrix = new float[9];SensorManager.getRotationMatrix(rotationMatrix, null, accelerometerValues, magnetometerValues);float[] orientation = new float[3];SensorManager.getOrientation(rotationMatrix, orientation);//Azimuth	围绕z轴的偏转角度，[-π,π]，当面向南方时，值为0float azimuth = (float) Math.toDegrees(orientation[0]);//Pitch	围绕x轴的偏转角度，[-π/2,π/2]，手机水平放置时为0float pitch = (float) Math.toDegrees(orientation[1]);//Roll	围绕y轴的偏转角度，[-π,π]，手机水平放置时为0float roll = (float) Math.toDegrees(orientation[2]);float mProgressAzimuth = (azimuth + 360) % 360 ;float mProgressPitch = (pitch + 360) % 360 ;float mProgressRoll = (roll + 360) % 360 ;//todo 根据具体需求处理逻辑}@Overridepublic void onAccuracyChanged(Sensor sensor, int accuracy) {if (accuracy >= SensorManager.SENSOR_STATUS_ACCURACY_HIGH) {Log.e("Compass", "不需要校准");} else {Log.e("Compass", "需要校准");}}