Question

hi i am a new developer. In my app i am trying to show the latitude and longitude of a place. When the app is started, automatically i want the values to be shown Following is my code.

{
  setContentView(R.layout.main);

        if(entered)
        {
            loadCoords();
        }
        Coords coords = loadCoords();


    }

    private Coords loadCoords() 
    {
        TextView latText = (TextView) findViewById(R.id.latText);
        TextView lngText = (TextView) findViewById(R.id.lngText);
        LocationManager myManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
        if(myManager != null){
            //List list = myManager.getAllProviders();
            String param = (String)myManager.getProviders(true).get(0);
            Location loc = myManager.getLastKnownLocation(param); 
            if(loc != null){
                Double latPoint = loc.getLatitude();
                Double lngPoint = loc.getLongitude();
                    try {
                        latText.setText(latPoint.toString());
                        lngText.setText(lngPoint.toString());
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
            }
             else
                    Log.e("AndroidMaps ","Error: Location  is null");
        }
        else
            Log.e("AndroidMaps ","Error: Location Manager is null");
        return null;

    }
}

but my app gets crashed when i am trying to run it in a device.

the following is the error shown in logcat

ERROR/AndroidRuntime(6311): Uncaught handler: thread main exiting due to uncaught exception
ERROR/AndroidRuntime(6311): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.gis.ss/com.gis.ss.main}: java.lang.IndexOutOfBoundsException: Invalid location 0, size is 0
ERROR/AndroidRuntime(6311): Caused by: java.lang.IndexOutOfBoundsException: Invalid location 0, size is 0

can anyone explain me what is the error…plzzz

Answer 1

You are probably getting and empty list here:
String param = (String)myManager.getProviders(true).get(0); and trying to get the first of the list causes java.lang.IndexOutOfBoundsException try to add
<uses-permission android:name="android.permission.ACCESS_GPS" /> and <uses-permission android:name="android.permission.ACCESS_LOCATION " /> to your menifest.