Ionic: background geolocation

问题

I'm using Ionic & Firebase to create an Android application for geolocation. I used ngCordova.geolocation and I successfully get the device current location.

My problem is that I need to continuously get current location, as long as the user doesn't turn off geolocation and callback a function every time the geolocation change, and test if the user is inside one of many circles in the maps.

回答1:

Since you are already using the ngcordova.geolocation plugin, it has a method to keep tracking the device position via watchPosition. There's an example in the docs indicating how to use it:

  var watchOptions = {
    timeout : 3000,
    enableHighAccuracy: false // may cause errors if true
  };

  var watch = $cordovaGeolocation.watchPosition(watchOptions);
  watch.then(
    null,
    function(err) {
      // error
    },
    function(position) {
      var lat  = position.coords.latitude
      var long = position.coords.longitude

      /* Further code to execute on each update */
  });

来源：https://stackoverflow.com/questions/38994343/ionic-background-geolocation