Android 加速器(accelerometer) 使用,判断设备移动

public class Test extends Activity  implements SensorEventListener{

public static float swRoll;
public static float swPitch;
public static float swAzimuth;


public static SensorManager mSensorManager;
public static Sensor accelerometer;
public static Sensor magnetometer;

public static float[] mAccelerometer = null;
public static float[] mGeomagnetic = null;


public void onAccuracyChanged(Sensor sensor, int accuracy) {
}

@Override
public void onSensorChanged(SensorEvent event) {
    // onSensorChanged gets called for each sensor so we have to remember the values
    if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
        mAccelerometer = event.values;
    }

    if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD) {
        mGeomagnetic = event.values;
    }

    if (mAccelerometer != null && mGeomagnetic != null) {
        float R[] = new float[9];
        float I[] = new float[9];
        boolean success = SensorManager.getRotationMatrix(R, I, mAccelerometer, mGeomagnetic);

        if (success) {
            float orientation[] = new float[3];
            SensorManager.getOrientation(R, orientation);
            // at this point, orientation contains the azimuth(direction), pitch and roll values.
              double azimuth = 180 * orientation[0] / Math.PI;
              double pitch = 180 * orientation[1] / Math.PI;
              double roll = 180 * orientation[2] / Math.PI;
        }
    }
}



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
    accelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
    magnetometer = mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
}

@Override
protected void onResume() {
    super.onResume();

    mSensorManager.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_GAME);
    mSensorManager.registerListener(this, magnetometer, SensorManager.SENSOR_DELAY_GAME);
}

@Override
protected void onPause() {
    super.onPause();
    mSensorManager.unregisterListener(this, accelerometer);
    mSensorManager.unregisterListener(this, magnetometer);
}