Fix Notifications for Android TV (#10798)

* Fixed icon path, added dynamic icon

* Addressing requested changes

* Using DEFAULT_ICON

* Using CONF_ICON from const

* Getting hass_frontend path via import

* Lint

* Using embedded 1px transparent icon

* woof -.-

* Lint

homeassistant/components/notify/nfandroidtv.py

@@ -4,8 +4,9 @@ Notifications for Android TV notification service.
 For more details about this platform, please refer to the documentation at
 https://home-assistant.io/components/notify.nfandroidtv/
 """
-import os
 import logging
+import io
+import base64
 
 import requests
 import voluptuous as vol
@@ -31,6 +32,9 @@ DEFAULT_TRANSPARENCY = 'default'
 DEFAULT_COLOR = 'grey'
 DEFAULT_INTERRUPT = False
 DEFAULT_TIMEOUT = 5
+DEFAULT_ICON = (
+    'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR4nGP6zwAAAgcBApo'
+    'cMXEAAAAASUVORK5CYII=')
 
 ATTR_DURATION = 'duration'
 ATTR_POSITION = 'position'
@@ -110,16 +114,13 @@ class NFAndroidTVNotificationService(BaseNotificationService):
         self._default_color = color
         self._default_interrupt = interrupt
         self._timeout = timeout
-        self._icon_file = os.path.join(
-            os.path.dirname(__file__), '..', 'frontend', 'www_static', 'icons',
-            'favicon-192x192.png')
+        self._icon_file = io.BytesIO(base64.b64decode(DEFAULT_ICON))
 
     def send_message(self, message="", **kwargs):
         """Send a message to a Android TV device."""
         _LOGGER.debug("Sending notification to: %s", self._target)
 
-        payload = dict(filename=('icon.png',
-                                 open(self._icon_file, 'rb'),
+        payload = dict(filename=('icon.png', self._icon_file,
                                  'application/octet-stream',
                                  {'Expires': '0'}), type='0',
                        title=kwargs.get(ATTR_TITLE, ATTR_TITLE_DEFAULT),
@@ -129,7 +130,7 @@ class NFAndroidTVNotificationService(BaseNotificationService):
                        transparency='%i' % TRANSPARENCIES.get(
                            self._default_transparency),
                        offset='0', app=ATTR_TITLE_DEFAULT, force='true',
-                       interrupt='%i' % self._default_interrupt)
+                       interrupt='%i' % self._default_interrupt,)
 
         data = kwargs.get(ATTR_DATA)
         if data: