Question

I am trying to get GPS data without using map view.The code that I have below is from O’Rielly’s Programming Android book and is supposed to work but is not. I am using an Android 2.2.1 phone and the app closes immediately after it starts.

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    tvLattitude = (TextView) findViewById(R.id.tvLattitude);
    tvLongitude = (TextView) findViewById(R.id.tvLongitude);

    lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    Location loc = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);

    tvLattitude.setText(Double.toString(loc.getLatitude()));
    tvLongitude.setText(Double.toString(loc.getLongitude()));

    locListenD = new DispLocListener();
    lm.requestLocationUpdates("gps", 30000L, 10.0f, locListenD);}

private class DispLocListener implements LocationListener {
    @Override
    public void onLocationChanged(Location location) {
        // TODO Auto-generated method stub
        tvLattitude.setText(Double.toString(location.getLatitude()));
        tvLongitude.setText(Double.toString(location.getLongitude()));}
    @Override
    public void onProviderDisabled(String arg0) {
        // TODO Auto-generated method stub
}
    @Override
    public void onProviderEnabled(String arg0) {
        // TODO Auto-generated method stub
    }
    @Override
    public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
        // TODO Auto-generated method stub
        }}
@Override
protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
    lm.removeUpdates(locListenD);}

@Override
protected void onResume() {
    // TODO Auto-generated method stub
    super.onResume();
    lm.requestLocationUpdates("gps", 30000L, 10.0f, locListenD);}

Answer 1

Perhaps you need to add the permissions

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />  

to your manifest?

Well, I set up a similar project and found a problem with your code: in onCreate you immediately try to set the location from previous locations (which on first run obviously wouldn’t be available). I erased those lines and the code seems to run fine

@Override
public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);

  tvLattitude = (TextView) findViewById(R.id.tvLattitude);
  tvLongitude = (TextView) findViewById(R.id.tvLongitude);

  lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

  locListenD = new DispLocListener();
  lm.requestLocationUpdates("gps", 30000L, 10.0f, locListenD);
}