Question

我正在开发一个Android应用程序，我要求显示用户当前位置和其他用途靠近谷歌地图上的当前位置。为了让用户在当前位置附近，我需要单独的服务来传递用户当前位置lat / long，

我的问题是我如何获取用户当前位置并在地图上显示（就像iphone带有一些动画）所有其他用户靠近当前位置（每个用户都有一个类型，具体取决于我需要在地图上显示不同标记/可绘制的类型）

任何想法或任何教程链接示例代码都会帮助我

萨姆

Answer 1

首先你需要一个mapview：

MapView mapView = (MapView) findViewById(R.id.mapView);

显示其他用户：

List<GeoPoint> otherUsers = .... from your service
for(GeoPoint user: otherUsers )
{
     mapView .addOverlay(new MapOverlay(user);
}

将地图围绕用户居中：

LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);

Location l = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
//or if you want to use gps l = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
//you may want to use a different manner of getting the location since this may be out of date. see http://developer.android.com/reference/android/location/LocationListener.html for live data
point = new GeoPoint((int)(l.getLatitude()*1e6),(int)(l.getLongitude()*1e6));
mc.animateTo(point);
mapView.setBuiltInZoomControls(true);
mapView.invalidate();

需要显示其他用户的覆盖类：

public class MapOverlay extends Overlay {

    private GeoPoint data;  

    public MapLineOverlay( GeoPoint item) {
        data = item;
    }

    /* (non-Javadoc)
    * @see com.google.android.maps.Overlay#draw(android.graphics.Canvas, com.google.android.maps.MapView, boolean, long)
    */
    @Override
    public boolean draw(Canvas canvas, MapView mapView, boolean shadow,long when) {
        Projection projection = mapView.getProjection();
        if (shadow == false) {
            Paint paint = new Paint();
            paint.setAntiAlias(true);
            Point point = new Point();
            projection.toPixels(data, point);
            paint.setColor(color);
            paint.setStrokeWidth(4);
            canvas.drawPoint((float) point.x, (float) point.y, , paint);
            }
        return super.draw(canvas, mapView, shadow, when);
    }

    /* (non-Javadoc)
    * @see com.google.android.maps.Overlay#draw(android.graphics.Canvas, com.google.android.maps.MapView, boolean)
    */
    @Override
    public void draw(Canvas canvas, MapView mapView, boolean shadow) {

        super.draw(canvas, mapView, shadow);
    }       
}

android：在android地图上显示用户当前位置和其他用户靠近当前位置

1 个答案: