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如何通过Android中的GPS获取当前位置。我使用下面的代码..如何通过Android中的GPS获取当前位置
但是,当我使用LastKnowKnown位置时,它抛出空指针异常..代码如下
请任何机构给予帮助。如何解决?
public void getlocation()
{
lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
locationListener = new MyLocationListener();
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
}
class MyLocationListener implements LocationListener
{
String a;
String b;
String c;
public void onLocationChanged(Location loc)
{
if (loc != null) {
LAT = loc.getLatitude();
LONG = loc.getLongitude();
a=Double.toString(LAT);
b=Double.toString(LONG);
c="-----LAT is:"+a+" "+"LONG is--------:"+b;
System.out.println(c);
}
}
public void getPresentLocation() {
String a;
String b;
String c;
lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
Location location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
LAT = location.getLatitude();
LONG = location.getLongitude();
a=Double.toString(LAT);
b=Double.toString(LONG);
c="-----LAT is:"+a+" "+"LONG is--------:"+b;
System.out.println(c);