title: Sensor.TYPE_PROXIMITY returning NULL even though valid proximity sensor is present
body: <p>I am writing a test app to validate the Proximity sensor functionality on Samsung Galaxy Note 10.1 tablet (Wifi only). As per the device specification it supports a proximity sensor . How ever when I query for the supported sensors on the device it does not return a proximity sensor and hence the sensor of type <code>sensor.TYPE_PROXIMITY</code> is null . Is there any other way to validate proximity functionality other than using this class? Wondering why this would return null when the device spec clearly says that it supports proximity sensor. </p>
  
  <p>Relevant piece of code :</p>
  
  <pre><code>mSensorManager = (SensorManager)getSystemService(Context.SENSOR_SERVICE);
  mSensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY); //This returns null
  List&lt;Sensor&gt; sensorList = sensorManager.getSensorList(Sensor.TYPE_PROXIMITY); //returns null
  </code></pre>