Android-无法在模拟器上获取GPS位置
我正在尝试在android模拟器上使用gps,我有以下代码:
public class NL extends Activity { private LocationManager locmgr = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.nl);
locmgr = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Criteria crit = new Criteria();
crit.setAccuracy(Criteria.ACCURACY_FINE);
String provider = locmgr.getBestProvider(crit, true);
Location loc = locmgr.getLastKnownLocation(provider);
Toast msg = Toast.makeText(this, "Lon: " + Double.toString(loc.getLongitude()) + " Lat: " + Double.toString(loc.getLatitude()), Toast.LENGTH_SHORT);
msg.show();
}
}
我在清单中添加了以下行:
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
并且我已经使用DDMS方法和geo
fix方法设置了gps位置,但是当我运行代码时,我在Toast行上得到了一个NullPointerExeption,可能是因为loc为空。
我不知道错误在哪里…您能帮我吗?
更新!
感谢您的帮助,现在我使用以下代码,但没有收到任何错误,但是它不会在onChangeLocation内运行该代码…它不会运行Toast,并且不会在日志中返回任何消息!
public class NL extends Activity { private LocationManager locmgr = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.nl);
locmgr = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// Define a listener that responds to location updates
LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location loc) {
// Called when a new location is found by the network location provider.
Log.i("NOTIFICATION","onLocationChenged Triggered");
Toast msg = Toast.makeText(NetworkLocator.this, "Lon: " + Double.toString(loc.getLongitude()) + " Lat: " + Double.toString(loc.getLatitude()), Toast.LENGTH_SHORT);
msg.show();
}
public void onStatusChanged(String provider, int status, Bundle extras) {}
public void onProviderEnabled(String provider) {}
public void onProviderDisabled(String provider) {}
};
// Register the listener with the Location Manager to receive location updates
locmgr.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
}
}
谢谢!
回答:
找到解决方案:
LocationManager.NETWORK_PROVIDER错误。
更正:LocationManager.GPS_PROVIDER
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