Android感應器使用

    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中註冊監聽    @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中登出監聽    @Override     protected void onStop() {        super.onStop();        sensorManager.unregisterListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER));        sensorManager.unregisterListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION));     }//當感應器狀態發生改變時    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;                 }        }     }//更精確的改變     @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:其他參考資料

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