如何自动绘制行上谷歌地图为用户移动入拉绳 [英] how to draw line on Google map as user move draw line automatically

问题描述

我开发这个应用程序，我要画在地图上轨线的Andr​​oid应用程序

随着用户移动路径是自动绘制我找到了lat和长及其变化，每次

在位置改变，所以我想画在地图上线的时候，每次位置改变

我想这

 公共无效onLocationChanged（地点）{    弦乐味精=位置：+ location.getLatitude（）+，
            + location.getLongitude（）;
    Toast.makeText（这一点，味精，Toast.LENGTH_LONG）.show（）;
    双new_lat = location.getLatitude（）;
    双new_long = location.getLongitude（）;
    drawTrack（new_lat，new_long，previous_lat，previous_long）;
    previous_lat = new_lat;
    previous_long = new_long;
}
 

解决方案

这是我做过什么：

 公共无效onLocationChanged（地点）{
    prevLatitude =纬度;
    prevLongitude =经度;
    纬度= location.getLatitude（）;
    经度= location.getLongitude（）;
    的latLng =新的经纬度（纬度，经度）;    的PolylineOptions pOptions =新的PolylineOptions（）
        .WIDTH（5）
        。颜色（Color.GREEN）
        .geodesic（真）;
    对于（INT Z = 0; z，其中，routePoints.size（）; Z ++）{
        点的LatLng = routePoints.get（Z）;
        pOptions.add（点）;
    }
    行= googleMap.addPolyline（pOptions）;
    routePoints.add（的latLng）;
}
 

在路线点是经纬度的的ArrayList，线条折线和GoogleMap的是着，当然，你的GoogleMap的。因此，在类中添加的开头：

 私人GoogleMap的GoogleMap的;
私人折线线;
私人的ArrayList＆LT;＆经纬度GT;路线点;
 

和在OnCreate添加：

 路线点=新的ArrayList＆LT;＆经纬度GT;（）;
 

希望这可以帮助你：！）

I am developing an android application in this application i want to draw path line on map

As user move path is draw automatically i found the lat and long and its change every time

When location is changed so i want to draw line on map when every time location is changed

i tried this

public void onLocationChanged(Location location) {

    String msg = "Location:" + location.getLatitude() + ","
            + location.getLongitude();
    Toast.makeText(this, msg, Toast.LENGTH_LONG).show();
    double new_lat = location.getLatitude();
    double new_long = location.getLongitude();
    drawTrack(new_lat, new_long, previous_lat, previous_long);
    previous_lat = new_lat;
    previous_long = new_long;
}

解决方案

This is what I did:

public void onLocationChanged(Location location) {
    prevLatitude = latitude;
    prevLongitude = longitude;
    latitude = location.getLatitude();
    longitude = location.getLongitude();
    latLng = new LatLng(latitude, longitude);

    PolylineOptions pOptions = new PolylineOptions()
        .width(5)
        .color(Color.GREEN)
        .geodesic(true);
    for (int z = 0; z < routePoints.size(); z++) {
        LatLng point = routePoints.get(z);
        pOptions.add(point);
    }
    line = googleMap.addPolyline(pOptions);
    routePoints.add(latLng);
}

in which routePoints is an arraylist of LatLng's, line is your Polyline and googleMap is, ofcourse, your GoogleMap. So on the beginning of the class add:

private GoogleMap googleMap;
private Polyline line;
private ArrayList<LatLng> routePoints;

and in the onCreate add:

routePoints = new ArrayList<LatLng>();

hope this helps for you!:)

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