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위도와 경도를 반환하는 Android 앱을 작성 중이지만 위치는 Null 값을 포함합니다.위치가 NULL을 반환합니다.
이유를 볼 수 있는지 확인하십시오. 하루 종일 저를 괴롭혔습니다. 아래 코드 :
는 GPS 적 장치가 부팅 된 이후 위치를 확보하지 않은 경우public class example extends Activity {
public static double latitude;
public static double longitude;
LocationManager lm;
LocationListener ll;
Location location;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.questions);
lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
ll = new MyLocationListener();
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, ll);
//location = lm.getLastKnownLocation(lm.getBestProvider(criteria, true));
Button b = (Button) findViewById(R.id.button2);
b.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
String provider = Settings.Secure.getString(getContentResolver(), Settings.Secure.LOCATION_PROVIDERS_ALLOWED);
int index1 = provider.indexOf("gps");
if(index1 < 0)
// gps not enabled, call msgbox
showMsgBox("GPS is off", "GPS is off. Turn it on?", "Turn on");
else
areWeThereYet(); }});
}
private void areWeThereYet()
{
if(weAreThere())
{
toastMsg("in correct place");
}
else if(location!=null)
toastMsg("not there yet");
}
private boolean weAreThere() {
location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location!=null)
{
longitude = location.getLongitude();
latitude = location.getLatitude();
toastMsg(latitude + " " + longitude);
return inCorrectPlace(question);
}
else
{
toastMsg("Location not ready yet");
return false;
}
}
private void toastMsg(String msg) {
Toast toast = Toast.makeText(this, msg, 2000);
toast.setGravity(Gravity.BOTTOM, 0, 0);
toast.show();
}
}