Поставщик GPS включен, но getLastKnownLocation (поставщик) возвращает значение null

Я пытаюсь использовать поставщика GPS для своего приложения.

Приложение определяет текущее местоположение устройства с помощью GPS Location Provider.

Приложение работает просто отлично. Но, хотя мой GPS_Provider включен, geLastKnownLocation() возвращает null.

MainActivity.java

public class MainActivity extends Activity {

    @Override
    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);

        Log.v("BEFORE", "Location is: " + location);
        updateWithNewLocation(location);
        Log.v("AFTER", "LOCATION FOUND");
    }

    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);
    }

}

Манифест.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.paad.whereami"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="4"
    android:targetSdkVersion="15" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

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

</manifest>