这是我的代码。请告诉我 y 它无法计算距离。在此代码中res
是一个长变量,应该存储所经过的总距离。该代码应该在纬度和经度发生变化时立即根据 GPS 计算距离。
String serviceString = Context.LOCATION_SERVICE;
LocationManager locationManager;
locationManager= (LocationManager)getSystemService(serviceString);
String provider = LocationManager.GPS_PROVIDER;
final Location loc1=locationManager.getLastKnownLocation(provider);
//Location loc1=new Location("");
String netprovider=LocationManager.NETWORK_PROVIDER;
lat1=loc1.getLatitude();
lon1=loc1.getLongitude();
LocationListener myLocationListener = new LocationListener()
{
public void onLocationChanged(Location loc1)
{
Location loc2=new Location("");
lat2=loc2.getLatitude();
lon2=loc2.getLongitude();
dtvalue.setText(lat1+","+lon1+","+lat2+","+lon2);
Location.distanceBetween(lat1,lon1,lat2,lon2,dist);
res=res+(long)dist[0];
lat1=lat2;
lon1=lon2;
}
public void onProviderDisabled(String provider)
{
// Update application if provider disabled.
}
public void onProviderEnabled(String provider)
{
// Update application if provider enabled.
}
public void onStatusChanged(String provider, int status,
Bundle extras)
{
// Update application if provider hardware status changed.
}
};
locationManager.requestLocationUpdates(provider, 5000, 1, myLocationListener);
locationManager.requestLocationUpdates(netprovider, 5000, 1, myLocationListener);
您定义空位置的问题Location loc2=new Location("");
然后使用它。
您可以定义lat1
and lon1
在你的班级里。
public void onLocationChanged(Location loc1)
{
if(lat1 != 0 && long1 != 0) {
Location.distanceBetween(lat1,lon1,loc1.getLatitude(),loc1.getLongitude(),dist);
res+=(long)dist[0];
}
lat1=loc1.getLatitude();
lon1=loc1.getLongitude();
}
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