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我最近使用鈦合金來開發Android應用程序。現在我試着(第一次)用比較函數按距離排序綁定的骨幹集合,但它不起作用。與鈦合金模型按距離排序
comparator: function(game) {
var lon1, lat1, lat2, lon2;
if (Ti.Geolocation.locationServicesEnabled) {
Ti.Geolocation.getCurrentPosition(function(e) {
if (e.error) {
Ti.API.error('Error:' + e.error);
return 0;
} else {
Ti.API.info(e.coords);
lon1 = e.coords.longitude;
lat1 = e.coords.latitude;
Titanium.Geolocation.forwardGeocoder(game.get("camp"), function(e) {
if (e.success) {
lat2 = e.latitude;
lon2 = e.longitude;
var R = 6371; // km
var dLat = (lat2 - lat1) * Math.PI/180;
var dLon = (lon2 - lon1) * Math.PI/180;
var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
Math.cos(lat1 * Math.PI/180) * Math.cos(lat2 * Math.PI/180) *
Math.sin(dLon/2) * Math.sin(dLon/2);
var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
var d = R * c;
console.log("KM: " + parseInt(d));
return parseInt(d);
} else {
console.log("Unable to find address");
return 0;
}
});
}
});
} else {
console.log('please enable location services')
return 0;
}
}
在我的控制,我使用:
var games = Alloy.Collections.allGames;
games.sort();
games.fetch();
你能告訴我什麼是錯?
我明白,很多! – Luca4k4