如何在AIR Android应用程序中的JS和AS3之间进行通信？ [英] How do I communicate between JS and AS3 in an AIR Android Application?
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="https://maps.googleapis.com/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。
You can try the StageWebViewBridge library to help you with this.
您也可以尝试使用 Web View ANE 支持JS通信。
You could also try using a Web View ANE that supports JS communication.
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