Android - Error Test GPS on Emulator

i wanna test GPS on my android emulator but i find my apps has Error "Stopped Unexpectedly" when i try to run its on emulator.

here some sort of my codes AndroidManifest.xml

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

and main.java

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

    LocationManager locationManager;
    String context = Context.LOCATION_SERVICE;
    locationManager = (LocationManager)getSystemService(context);

    String provider = LocationManager.GPS_PROVIDER;
    Location location = locationManager.getLastKnownLocation(provider);
    updateWithNewLocation(location);
}

private void updateWithNewLocation(Location location){
    String latLongString;
    TextView myLocationText;
    myLocationText = (TextView)findViewById(R.id.myLocationText);
    if(location != null){
        double lat = location.getLatitude();
        double lng = location.getLongitude();
        latLongString = "Lat:" + lat + "\nLong:" + lng;
    }else{
        latLongString = "No location found";
    }
    myLocationText.setText("Your Current Position is: \n" + latLongString);
}

import on my main.java

import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.TextView;

would you tell me why my apps getting error "stopped unexpectedly" when i try to run its on my emulator ?

thanks for helping me :)

Error from tracing : "java.lang.NullPointerException" i have been using DDMS to set long and lat to this: long: 112.8010100 lat : -7.2950700

You can mock the location in the emulator

Providing Mock Location Data

As you develop your application, you'll certainly need to test how well your model for obtaining user location works. This is most easily done using a real Android-powered device. If, however, you don't have a device, you can still test your location-based features by mocking location data in the Android emulator. There are three different ways to send your application mock location data: using Eclipse, DDMS, or the "geo" command in the emulator console.

Note: Providing mock location data is injected as GPS location data, so you must request location updates from GPS_PROVIDER in order for mock location data to work.

Using Eclipse

Select Window > Show View > Other > Emulator Control.

In the Emulator Control panel, enter GPS coordinates under Location Controls as individual lat/long coordinates, with a GPX file for route playback, or a KML file for multiple place marks. (Be sure that you have a device selected in the Devices panel—available from Window > Show View > Other > Devices.)

Using DDMS

With the DDMS tool, you can simulate location data a few different ways:

Manually send individual longitude/latitude coordinates to the device. Use a GPX file describing a route for playback to the device. Use a KML file describing individual place marks for sequenced playback to the device. For more information on using DDMS to spoof location data, see Using DDMS.

Using the "geo" command in the emulator console

To send mock location data from the command line:

Launch your application in the Android emulator and open a terminal/console in your SDK's /tools directory. Connect to the emulator console: telnet localhost Send the location data: geo fix to send a fixed geo-location. This command accepts a longitude and latitude in decimal degrees, and an optional altitude in meters. For example: geo fix -121.45356 46.51119 4392 geo nmea to send an NMEA 0183 sentence. This command accepts a single NMEA sentence of type '$GPGGA' (fix data) or '$GPRMC' (transit data). For example: geo nmea $GPRMC,081836,A,3751.65,S,14507.36,E,000.0,360.0,130998,011.3,E*62 For information about how to connect to the emulator console, see Using the Emulator Console.