old_contents: from jnius import autoclass
  from jnius import cast
  from jnius import java_method
  from jnius import PythonJavaClass
  
  from plyer.platforms.android import activity
  from plyer.facades import Proximity
  
  ActivityInfo = autoclass('android.content.pm.ActivityInfo')
  Context = autoclass('android.content.Context')
  Sensor = autoclass('android.hardware.Sensor')
  SensorManager = autoclass('android.hardware.SensorManager')
  
  
  class ProximitySensorListener(PythonJavaClass):
      __javainterfaces__ = ['android/hardware/SensorEventListener']
  
      def __init__(self):
          super(ProximitySensorListener, self).__init__()
          service = activity.getSystemService(Context.SENSOR_SERVICE)
          self.SensorManager = cast('android.hardware.SensorManager', service)
  
          self.sensor = self.SensorManager.getDefaultSensor(
              Sensor.TYPE_PROXIMITY)
          self.value = None
  
      def enable(self):
          self.SensorManager.registerListener(self, self.sensor,
                      SensorManager.SENSOR_DELAY_NORMAL)
  
      def disable(self):
          self.SensorManager.unregisterListener(self, self.sensor)
  
      @java_method('(Landroid/hardware/SensorEvent;)V')
      def onSensorChanged(self, event):
          self.value = event.values[0]
  
      @java_method('(Landroid/hardware/Sensor;I)V')
      def onAccuracyChanged(self, sensor, accuracy):
          pass
  
  
  class AndroidProximity(Proximity):
  
      listener = None
  
      def _enable(self, **kwargs):
          if not self.listener:
              self.listener = ProximitySensorListener()
              self.listener.enable()
  
      def _disable(self, **kwargs):
          if self.listener:
              self.listener.disable()
              delattr(self, 'listener')
  
      def _get_proximity(self):
          if self.listener and self.listener.value:
              value = self.listener.value
              return value < 3.0
  
  
  def instance():
      return AndroidProximity()
  
new_contents: from jnius import autoclass
  from jnius import cast
  from jnius import java_method
  from jnius import PythonJavaClass
  
  from plyer.platforms.android import activity
  from plyer.facades import Proximity
  
  ActivityInfo = autoclass('android.content.pm.ActivityInfo')
  Context = autoclass('android.content.Context')
  Sensor = autoclass('android.hardware.Sensor')
  SensorManager = autoclass('android.hardware.SensorManager')
  
  
  class ProximitySensorListener(PythonJavaClass):
      __javainterfaces__ = ['android/hardware/SensorEventListener']
  
      def __init__(self):
          super(ProximitySensorListener, self).__init__()
          service = activity.getSystemService(Context.SENSOR_SERVICE)
          self.SensorManager = cast('android.hardware.SensorManager', service)
  
          self.sensor = self.SensorManager.getDefaultSensor(
              Sensor.TYPE_PROXIMITY)
          self.value = None
  
      def enable(self):
          self.SensorManager.registerListener(self, self.sensor,
                      SensorManager.SENSOR_DELAY_NORMAL)
  
      def disable(self):
          self.SensorManager.unregisterListener(self, self.sensor)
  
      @java_method('(Landroid/hardware/SensorEvent;)V')
      def onSensorChanged(self, event):
          self.value = event.values[0]
  
      @java_method('(Landroid/hardware/Sensor;I)V')
      def onAccuracyChanged(self, sensor, accuracy):
          pass
  
  
  class AndroidProximity(Proximity):
  
      listener = None
  
      def _enable(self, **kwargs):
          if not self.listener:
              self.listener = ProximitySensorListener()
              self.listener.enable()
  
      def _disable(self, **kwargs):
          if self.listener:
              self.listener.disable()
              delattr(self, 'listener')
  
      def _get_proximity(self):
          if self.listener and self.listener.value:
              value = self.listener.value
              # value is None when proxime sensor is covered. In other case
              # it returns some value.
              return not value or value < 5.0
  
  
  def instance():
      return AndroidProximity()
  
subject: fix for none errors