空指针，用于在Android Emulator中定义提供程序

Question

I am getting a null pointer exception when trying to run an app that gets my current location in the Android Emulator.

            String provider = LocationManager.NETWORK_PROVIDER;
        Location loc;
        loc = manager.getLastKnownLocation(provider);
        latitude = loc.getLatitude();
        longitude = loc.getLongitude();

The logcat is pointing me to the definition of provider that it seems I must use in my location manager instance to get the current location? Is this returning a null pointer because I don't have any networks? If so, how do I work around this in the android emulator? I set my Latitude and Longitude in the device directly both through telnet and the ddms manager and it does not remove the error.

Answer 1

Emulator not support for the getting the current location. So in that case to run in emulator you need to load the kml.

1. Go to DDMS repository.
2. select current running emulator
3. scroll down load the kml and run
4. run the app on this emulator

location.kml

<?xml version="1.0" encoding="UTF-8" ?><kml xmlns="http://earth.google.com/kml/2.0">
        <Folder>
            <name>Sisyphus Peak from Wilmot Saddle</name>
            <open>1</open>

                <Placemark>
                    <name>Ashburn</name>
                    <Point>
                        <coordinates>-77.49009453474123,39.01333532337567,0</coordinates>
                    </Point>
                </Placemark>

                <Placemark>
                    <name>point-1</name>
                    <Point>
                        <coordinates>-77.48302697807792,39.00625954769475,0</coordinates>
                    </Point>
                </Placemark>

                <Placemark>
                    <name>point-2</name>
                    <Point>
                        <coordinates>-77.47311743511652,39.00018050891467,0</coordinates>
                    </Point>
                </Placemark>

                <Placemark>
                    <name>point-8</name>
                    <Point>
                        <coordinates>-77.42401333359562,38.97922939627798,0</coordinates>
                    </Point>
                </Placemark>

                <Placemark>
                    <name>point-9</name>
                    <Point>
                        <coordinates>-77.42003559704499,38.97778114326241,0</coordinates>
                    </Point>
                </Placemark>

                <Placemark>
                    <name>point-10</name>
                    <Point>
                        <coordinates>-77.41751898937368,38.97662869617142,0</coordinates>
                    </Point>
                </Placemark>

                <Placemark>
                    <name>point-11</name>
                    <Point>
                        <coordinates>-77.4138528755813,38.97459310765229,0</coordinates>
                    </Point>
                </Placemark>

                <Placemark>
                    <name>point-12</name>
                    <Point>
                        <coordinates>-77.40659262377542,38.97146307963115,0</coordinates>
                    </Point>
                </Placemark>

                <Placemark>
                    <name>point-13</name>
                    <Point>
                        <coordinates>-77.40273606167617,38.96926642020819,0</coordinates>
                    </Point>
                </Placemark>

                <Placemark>
                    <name>point-14</name>
                    <Point>
                        <coordinates>-77.40027538351835,38.9670792991095,0</coordinates>
                    </Point>
                </Placemark>

                <Placemark>
                    <name>point-15</name>
                    <Point>
                        <coordinates>-77.397503898305,38.96335043764458,0</coordinates>
                    </Point>
                </Placemark>

                <Placemark>
                    <name>point-16</name>
                    <Point>
                        <coordinates>-77.39388172459363,38.96070433695704,0</coordinates>
                    </Point>
                </Placemark>
                <Placemark>
                    <name>point-17</name>
                    <Point>
                        <coordinates>-77.3897006097812,38.95805419575319,0</coordinates>
                    </Point>
                </Placemark>

                <Placemark>
                    <name>point-22</name>
                    <Point>
                        <coordinates>-77.36014667981878,38.95215584985607,0</coordinates>
                    </Point>
                </Placemark>

                <Placemark>
                    <name>point-23</name>
                    <Point>
                        <coordinates>-77.35481732900948,38.9512321715715,0</coordinates>
                    </Point>
                </Placemark>

                <Placemark>
                    <name>point-24</name>
                    <Point>
                        <coordinates>-77.34840625130377,38.94965466871911,0</coordinates>
                    </Point>
                </Placemark>

                <Placemark>
                    <name>point-25</name>
                    <Point>
                        <coordinates>-77.34310832451432,38.94852158323671,0</coordinates>
                    </Point>
                </Placemark>

                <Placemark>
                    <name>point-26</name>
                    <Point>
                        <coordinates>-77.3375389604111,38.94651446647728,0</coordinates>
                    </Point>
                </Placemark>

                <Placemark>
                    <name>point-27</name>
                    <Point>
                        <coordinates>-77.33316520209574,38.94474914006099,0</coordinates>
                    </Point>
                </Placemark>

                <Placemark>
                    <name>point-28</name>
                    <Point>
                        <coordinates>-77.3262314555746,38.94404490272601,0</coordinates>
                    </Point>
                </Placemark>
                <Placemark>
                    <name>point-29</name>
                    <Point>
                        <coordinates>-77.31866962122956,38.94550595598364,0</coordinates>
                    </Point>
                </Placemark>

        </Folder>
    </kml>