Android传感器使用

    public class SensorTest extends Activity implements SensorEventListener {
     
    SensorManager sensorManager = null;
     
    //for accelerometer values
    TextView outputX;
    TextView outputY;
    TextView outputZ;
     
    //for orientation values
    TextView outputX2;
    TextView outputY2;
    TextView outputZ2;
     
     @Override
     public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

    //初始化sensorManager
    sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
    setContentView(R.layout.main);
 
    //just some textviews, for data output
    outputX = (TextView) findViewById(R.id.TextView01);
    outputY = (TextView) findViewById(R.id.TextView02);
    outputZ = (TextView) findViewById(R.id.TextView03);
 
    outputX2 = (TextView) findViewById(R.id.TextView04);
    outputY2 = (TextView) findViewById(R.id.TextView05);
    outputZ2 = (TextView) findViewById(R.id.TextView06);
 }



//在onResume中注册监听

    @Override
     protected void onResume() {
        super.onResume();
        sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), sensorManager.SENSOR_DELAY_GAME);
        sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION), sensorManager.SENSOR_DELAY_GAME);
     }

//在onStop中注销监听

    @Override
     protected void onStop() {
        super.onStop();
        sensorManager.unregisterListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER));
        sensorManager.unregisterListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION));
     }


//当传感器状态发生改变时

    public void onSensorChanged(SensorEvent event) {
        synchronized (this) {
            switch (event.sensor.getType()){
                case Sensor.TYPE_ACCELEROMETER:
                    outputX.setText("x:"+Float.toString(event.values[0]));
                    outputY.setText("y:"+Float.toString(event.values[1]));
                    outputZ.setText("z:"+Float.toString(event.values[2]));
                break;
            case Sensor.TYPE_ORIENTATION:
                    outputX2.setText("x:"+Float.toString(event.values[0]));
                    outputY2.setText("y:"+Float.toString(event.values[1]));
                    outputZ2.setText("z:"+Float.toString(event.values[2]));
            break;
     
            }
        }
     }

//更精确的改变

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

To sum things up, to access sensor data you have to do the following things:
1. Check sensor availability.
2. Register a listener to a sensorManager.
3. Catch the needed data , from onSensorChanged.
4. Unregister the sensorManager's listener.

另:其他参考资料

1, http://www.ibm.com/developerworks/opensource/library/os-android-sensor/index.html?ca=dgr-lnxw09Android-Sensors&S_TACT=105AGX59&S_CMP=grlnxw09