android – 使用GPS和WIFI获取当前位置

我找到了这个例子：get the current location (gps/wifi)
但

我不确定哪条线告诉设备选择哪个连接.我猜它就是这个：String provider = myLocationManager.getBestProvider(criteria,true);我要添加到我的代码中.

当我检查其中的内容时,我总是得到一个空值,我不太明白为什么.

我的代码看起来像这样：

public void getOwnLngLat(){
LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
final LocationListener locationListener = new LocationListener(){

public void onLocationChanged(Location location) {
    // TODO Auto-generated method stub
    longitude="" + location.getLongitude();
    latitude="" + location.getLatitude();
}

public void onProviderDisabled(String provider) {
    // TODO Auto-generated method stub

}

public void onProviderEnabled(String provider) {
    // TODO Auto-generated method stub

}

public void onStatusChanged(String provider, int status,
                Bundle extras) {
    // TODO Auto-generated method stub

   }        
};
locationManager.requestLocationUpdates(locationManager.getBestProvider(new Criteria(), true), 2000, 10, locationListener);
}