如何在AIR Android应用程序中的JS和AS3之间进行通信？

编程入门行业动态更新时间:2024-10-26 16:31:18

本文介绍了如何在AIR Android应用程序中的JS和AS3之间进行通信？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！问题描述

我正在使用ExternalInterface，但之前我从未使用过它，因此我不知道该做什么。我甚至不知道ExternalInterface是否适用于AIR Android。

I am using ExternalInterface but I have never worked with it before so I don't know what really to do. I don't even know if ExternalInterface works with AIR Android .

我正在尝试实现JS Google Maps API。此时我可以使用StageWebView加载网页。我可以在JS中访问经度和纬度值，但是当我在地图上选择一个位置时，我需要从AS3访问这些值。

I am trying to implement the JS Google Maps API . At this point I am able to load the webpage with StageWebView. I can access the longitudes and latitudes values in JS but I need to access those values from AS3 when the selects a location on the map.

这是HTML：

<!DOCTYPE html> <html> <head> <style type="text/css"> html, body { height: 100%; margin: 0; padding: 0; } #map { height: 100%; } </style> </head> <body> <div id="map"> </div> <script src="map.js"> </script> <script async defer src="maps.googleapis/maps/api/js?key=AIzaSyBBCPwGs_7_ys3eyx7pyjPeVFoYABeSUzw &libraries=visualization&callback=initMap"> </script> </body> </html>

JS：

var lat; var lng; window.initMap = function() { var map = new google.maps.Map(document.getElementById('map'), { center: {lat: 0, lng: 0}, zoom: 100, styles: [{ featureType: 'poi', stylers: [{ visibility: 'off' }] // Turn off points of interest. }, { featureType: 'transit.station', stylers: [{ visibility: 'off' }] // Turn off bus stations, train stations, etc. }], disableDoubleClickZoom: true }); map.addListener('click', function(e) { var marker = new google.maps.Marker({ position: {lat: e.latLng.lat(), lng: e.latLng.lng()}, map: map }); lat = e.latLng.lat(); lng = e.latLng.lng(); getLatLng(); }); } function getLatLng() { var latlng = []; latlng.push(lat); latlng.push(lng); alert("coordinates", lat, lng); return latlng; }

AS3：

private var _gmapHTMLFile:File; private var _webView:StageWebView; private var _mapURL:String; gmapHTMLFile = File.applicationDirectory.resolvePath("gmap/gmap.html"); mapURL = gmapHTMLFile.nativePath; webView = new StageWebView(); webView.stage = stage; webView.viewPort = new Rectangle(0, 0, stage.stageWidth, stage.stageHeight); webView.addEventListener(MouseEvent.MOUSE_UP, onLocationSelected) webView.loadURL(mapURL); private function onLocationSelected(e:MouseEvent):void { webView.loadURL("javascript:getlatlng()"); //I also tried // var latslngs:Array = webView.loadURL("javascript:getlatlng()"); // doesn't work, obviously }

onLocationSelected函数是什么它只是在AIR中显示一个警告窗口，其中包含JavaScript的位置坐标。我的问题是如何使用ExternalInterface类访问和操作AS3中的lat和lng值？非常感谢任何帮助！谢谢

what the onLocationSelected function does is simply show an alert window inside AIR, that contains the location coordinates from the JavaScript. My question is how do I access and manipulate those lat and lng values in AS3 using the ExternalInterface Class? Any help is greatly appreciated! Thanks

推荐答案

您无法从中读取返回值javascript：getLatLong（），要从JS获取数据到AS3，老技巧是从JS设置 window.location ，然后在AS3中侦听 LOCATION_CHANGING 事件并从更改的位置解析数据，并且 event.preventDefault（）所以这个位置实际上并没有改变。

You can't read the return value from javascript:getLatLong(), to get data from JS to AS3 the old trick is to set the window.location from JS, then in AS3 listen for the LOCATION_CHANGING event and parse the data out of the changing location, and event.preventDefault() so the location doesn't actually change.

AS3：

webView.loadURL("javascript:sendLatLng()");

JS：

function sendLatLng() { location.href = "?lat=" + lat +"&lng=" + lng; }

AS3：

webView.addEventListener(LocationChangeEvent.LOCATION_CHANGING, locationChanging); function locationChanging(e:LocationChangeEvent):void { e.preventDefault(); var query:String = e.location.split("?")[1]; var vars:URLVariables = new URLVariables(query); trace(vars.lat, var.lng); }

您可以尝试 StageWebViewBridge 库可以帮助您解决此问题。