Android 怎么获得手机即时的重力感应的X，Y，Z轴的数值

Android 怎么获得手机即时的重力感应的X，Y，Z轴的数值

重心感力是手机自带的软件功能，不可以下载吧，我没有用过。

sensorMgr = (SensorManager) _main.getSystemService(SENSOR_SERVICE);
sensor = sensorMgr.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
SensorEventListener lsn = new SensorEventListener() {
public void onSensorChanged(SensorEvent e) {
x = e.values[SensorManager.DATA_X];
y = e.values[SensorManager.DATA_Y];
z = e.values[SensorManager.DATA_Z];
double g = x*x + y *y;
final int result1 = (int)(Math.acos(x/9.8)*180);
final int result2 = (int)(Math.acos(y/9.8)*180);
final int result3 = (int)(Math.acos(z/9.8)*180);
_main.runOnUiThread(new Runnable() {
@Override
public void run() {
radtxt.setText( String.valueOf(x)+" "+String.valueOf( y )+" "+String.valueOf( z ) );
}
});

}
public void onAccuracyChanged(Sensor s, int accuracy) {
}
};
sensorMgr.registerListener(lsn, sensor, SensorManager.SENSOR_DELAY_GAME);