title: Writing sensor data to files in WearableListenerService
body: <p>I'm collecting data from sensor and write to files in WearableListenerService.</p>
  
  <p>How do I start the service when the watch boots and keep it running all the time? </p>
  
  <p>It seems that Android wear automatically start this service if there's correct configuration in manifest. If not, do I need to explicitly send an intent from MainActivity?</p>