4.1

安卓中的传感器应用开发
安卓设备集成了多种传感器，如加速度计、陀螺仪、磁力计等，利用这些传感器可以开发出丰富的应用。​

1. 加速度计应用​
   获取加速度计数据：​
   ​
   SensorManager sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);​
   Sensor accelerometer = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);​
   SensorEventListener sensorEventListener = new SensorEventListener() {​
   @Override​
   public void onSensorChanged(SensorEvent event) {​
   if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {​
   float x = event.values[0];​
   float y = event.values[1];​
   float z = event.values[2];​
   // 根据加速度数据更新UI或执行逻辑​
   }​
   }​
   @Override​
   public void onAccuracyChanged(Sensor sensor, int accuracy) {​
   }​
   };​
   sensorManager.registerListener(sensorEventListener, accelerometer, SensorManager.SENSOR_DELAY_NORMAL);​
   ​
2. 陀螺仪应用​
   获取陀螺仪数据：​
   ​
   Sensor gyroscope = sensorManager.getDefaultSensor(Sensor.TYPE_GYROSCOPE);​
   SensorEventListener gyroscopeListener = new SensorEventListener() {​
   @Override​
   public void onSensorChanged(SensorEvent event) {​
   if (event.sensor.getType() == Sensor.TYPE_GYROSCOPE) {​
   float x = event.values[0];​
   float y = event.values[1];​
   float z = event.values[2];​
   // 根据陀螺仪数据实现旋转效果等​
   }​
   }​
   @Override​
   public void onAccuracyChanged(Sensor sensor, int accuracy) {​
   }​
   };​
   sensorManager.registerListener(gyroscopeListener, gyroscope, SensorManager.SENSOR_DELAY_NORMAL);​