传感器指南针数据

  private static final  String TAG = MainActivity.class.getSimpleName();


    private SensorManager sensorManager;

    private Sensor aSensor; //加速传感器
    private Sensor mSensor; //磁力传感器

    float[] accelerometerValues = new float[3];
    float[] magneticFieldValues = new float[3];


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
    }

    private void init(){
        //获取传感器的管理类
        sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
        aSensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        mSensor = sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);

        sensorManager.registerListener(myListener, aSensor, SensorManager.SENSOR_DELAY_NORMAL);
        sensorManager.registerListener(myListener, mSensor,SensorManager.SENSOR_DELAY_NORMAL);
        //更新显示数据的方法
        calculateOrientation();
    }


    SensorEventListener myListener = new SensorEventListener() {
        @Override
        public void onSensorChanged(SensorEvent event) {
            if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD)
                magneticFieldValues = event.values;
            if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER)
                accelerometerValues = event.values;
            calculateOrientation();
        }

        @Override
        public void onAccuracyChanged(Sensor sensor, int accuracy) {

        }
    };

    private  void calculateOrientation() {
        float[] values = new float[3];
        float[] R = new float[9];
        SensorManager.getRotationMatrix(R, null, accelerometerValues, magneticFieldValues);
        SensorManager.getOrientation(R, values);

        // 要经过一次数据格式的转换，转换为度
        values[0] = (float) Math.toDegrees(values[0]);
        Log.i(TAG, values[0]+"");
        //values[1] = (float) Math.toDegrees(values[1]);
        //values[2] = (float) Math.toDegrees(values[2]);

        if(values[0] >= -5 && values[0] < 5){
            Log.i(TAG, "正北");
        }
        else if(values[0] >= 5 && values[0] < 85){
            Log.i(TAG, "东北");
        }
        else if(values[0] >= 85 && values[0] <=95){
            Log.i(TAG, "正东");
        }
        else if(values[0] >= 95 && values[0] <175){
            Log.i(TAG, "东南");
        }
        else if((values[0] >= 175 && values[0] <= 180) || (values[0]) >= -180 && values[0] < -175){
            Log.i(TAG, "正南");
        }
        else if(values[0] >= -175 && values[0] <-95){
            Log.i(TAG, "西南");
        }
        else if(values[0] >= -95 && values[0] < -85){
            Log.i(TAG, "正西");
        }
        else if(values[0] >= -85 && values[0] <-5){
            Log.i(TAG, "西北");
        }
    }