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); }