public class MainActivity extends Activity{
  //声明一个SensorManager对象
  private SensorManager sensorManager;
  @Override
  public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    //获取SensorManager对象
    sensorManager=(SensorManager)getSystemService(Context.SESOR_SERVICE);
    //获取光线传感器对象
    Sensor lightSensor=sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);
    //注册传感器
    sensorManager.registerListener(new SensorEventListener(){
      public void onSensorChanged(SensorEvent event){
        float acc=event.accuracy;
        float lux=event.values[0];
        System.out.println("acc---->"+acc);
        System.out.println("lux---->"+lux);
      }
      public void onAccuracyChanged(Sensor sensor,int accuracy){
      }
    },lightSensor,SensorManager.SENSOR_DELAY_NORMAL);
  }
}
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2.Android设备传感器的特点
3.获取手机当中所有传感器的名称

使用传感器的方法：
1.获取SensorManager对象
2.执行SensorManager对象的getDefaultSensor()方法获取Sensor对象
3.获取Sensor对象的各种属性