Phonegap/Cordova 地理定位提醒特定位置附近有什么

Question

我需要一些指导来了解当我的位置位于指定位置附近时如何触发警报。

我想那时会使用谷歌地图和地理位置，但我不确定。

我也希望能够显示一些代码，但是在进行了无数次谷歌搜索后，我找不到任何东西，也不知道要查找什么。

我将使用 phonegap / cordova。

谁能指引我正确的方向？enter code here

Answer 1

听起来您正在寻找像这样的地理围栏插件：https://github.com/cowbell/cordova-plugin-geofence

这将让您监控您的设备何时进入和退出您设置的自定义地理围栏/位置区域。

使用 cordova plugin add cordova-plugin-geofence 将此添加到您的项目中，并按照其自述文件中的使用指南进行操作。

Answer 2

//Convert Destination Address to lat lng values
     var specificlocation = {
      lat: -13.26589,
      lng: 98.365297
    }

    function onDeviceReady() {
        //onDeviceReaddy
        navigator.geolocation.getCurrentPosition(displayAndWatch, locError);
    }


    // user Current Position
    function displayAndWatch(position) {
        setCurrentPosition(position);
        watchCurrentPosition();
    }

    function setCurrentPosition(pos) {
        var image = 'img/ic_CurrentLocationmap.png';

        currentPositionMarker = new google.maps.Marker({
            icon: image,
            map: map,
            position: new google.maps.LatLng(
                pos.coords.latitude,
                pos.coords.longitude
            ),
            title: "Current Location"
        });
        map.panTo(new google.maps.LatLng(
            pos.coords.latitude,
            pos.coords.longitude
        ));
    }

 //Watch User/phone current location
    function watchCurrentPosition() {
        var positionTimer = navigator.geolocation.watchPosition(
            function (position) {
                setMarkerPosition(
                    currentPositionMarker,
                    position
                );
            });
    }

    function setMarkerPosition(marker, position) {
        marker.setPosition(
            new google.maps.LatLng(
                position.coords.latitude,
                position.coords.longitude)
        );
        var center = {
            lat: position.coords.latitude,
            lng: position.coords.longitude
        }
        map.setCenter(center);

       //Check distance between specificlocation and user/phone current location
        var distance = DistanceBetweenTwoPoints(center.lat, center.lng, specificlocation.lat,
            specificlocation.lng, "K")

        //with in 100 Meters
        if (distance < 0.1) {
            navigator.notification.confirm(
                'You are Reached specificlocation Address', // message
                onConfirmReached, //Callback
                'AppName', // title
                ['No', 'Yes'] // buttonLabels
            );
        }
    function locError(error) {
        // the current position could not be located
    }

    function onConfirmReached(buttonIndex) {
        if (buttonIndex == 2) {
            //Alert result
        }
    }

 //Find Distance between Two coordinations 
    function DistanceBetweenTwoPoints(lat1, lon1, lat2, lon2, unit) {
        try {
            unit = "K"
            var radlat1 = Math.PI * lat1 / 180
            var radlat2 = Math.PI * lat2 / 180
            var radlon1 = Math.PI * lon1 / 180
            var radlon2 = Math.PI * lon2 / 180
            var theta = lon1 - lon2
            var radtheta = Math.PI * theta / 180
            var dist = Math.sin(radlat1) * Math.sin(radlat2) + Math.cos(radlat1) * Math.cos(radlat2) * Math.cos(
                radtheta);
            dist = Math.acos(dist)
            dist = dist * 180 / Math.PI
            dist = dist * 60 * 1.1515
            //Calculate Kilometer
            if (unit == "K") {
                dist = dist * 1.609344
            }
            //Calculate Miles
            if (unit == "N") {
                dist = dist * 0.8684
            }
            return dist;
        } catch (err) {
            console.log(err);
        }
    }