LocationSource只是一个帮助我处理位置数据的接口。它使用onLocationChanged(Location location)方法，该方法将 Location 对象作为参数（lat、long 和其他信息）。
因此，如果我理解这里所说的内容：
A GoogleMap object has a built-in location provider for its my-location layer, but it can be replaced with another one that implements this interface.
...我的 GoogleMap 对象有一个新的（内置位置提供程序）位置提供程序，尽管我可以使用LocationManager并从中选择
我的代码在下面（如您所见，我没有使用 LocationManager），当我点击我的位置时，我得到了一个非常准确的位置（mMap.setMyLocationEnabled(true); ）如果我有 GPS，我可以得到我的位置，所以我什么时候我只有wifi。
所以我的问题是：这个新的提供商与 GPS/网络“不同”吗？如果我不使用 locationManager 会有问题吗？（是的，我知道对于官方应用程序，我最好使用 LocationManager 来检查每个案例，但它仍然有效）。
我的猜测是它使用 GPS 或网络，但如果我都启用了哪个是默认设置？该应用首先使用哪个提供商？
代码：
public class MainActivity extends FragmentActivity implements OnMapClickListener, OnMapLongClickListener, LocationSource, LocationListener {
private GoogleMap mMap;
private OnLocationChangedListener mapLocationListener=null;
private static final LatLng SKG_VIEW = new LatLng(40.6402778, 22.9438889);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setUpMapIfNeeded();
// mMap = ( (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map) ).getMap();
}
@Override
protected void onResume() {
super.onResume();
setUpMapIfNeeded();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
/** **************** SetUp Map if needed *****************
*
* Sets up the map if it is possible to do so (i.e., the Google Play services APK is correctly
* installed) and the map has not already been instantiated.. This will ensure that we only ever
* call {@link #setUpMap()} once when {@link #mMap} is not null.
* <p>
* If it isn't installed {@link SupportMapFragment} (and
* {@link com.google.android.gms.maps.MapView
* MapView}) will show a prompt for the user to install/update the Google Play services APK on
* their device.
* <p>
* A user can return to this Activity after following the prompt and correctly
* installing/updating/enabling the Google Play services. Since the Activity may not have been
* completely destroyed during this process (it is likely that it would only be stopped or
* paused), {@link #onCreate(Bundle)} may not be called again so we should call this method in
* {@link #onResume()} to guarantee that it will be called.
*/
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the map.
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap();
mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
mMap.setMyLocationEnabled(true);
mMap.setOnMapClickListener(this);
/***
* ***** CAMERA *****
***/
// Construct a CameraPosition focusing on Mountain View and animate the camera to that position.
CameraPosition cameraPosition = new CameraPosition.Builder()
.target(SKG_VIEW) // Sets the center of the map to SKG_VIEW point
.zoom(7) // Sets the zoom
.build(); // Creates a CameraPosition from the builder
mMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
// Check if we were successful in obtaining the map.
if (mMap != null) {
setUpMap();
}
}
}
/** ****************** Add Markers ***************************
*
* This is where we can add markers or lines, add listeners or move the camera. In this case, we
* just add a marker near Africa.
*
* This should only be called once and when we are sure that {@link #mMap} is not null.
*/
private void setUpMap() {
mMap.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker"));
mMap.addMarker(new MarkerOptions().position(new LatLng(10, 10)).title("Marker 2"));
mMap.addMarker(new MarkerOptions().position(new LatLng(40, 40)).title("Marker 2"));
}
/**
*
* ***************** onMapClick *******************************
*
*/
@Override
public void onMapClick(LatLng point) {
mMap.animateCamera(CameraUpdateFactory.newLatLng(point));
}
@Override
public void onMapLongClick(LatLng point) {
//dont need it right now
}
@Override
public void activate(OnLocationChangedListener listener) {
// LocationSource
this.mapLocationListener=listener;
}
@Override
public void deactivate() {
// LocationSource
this.mapLocationListener=null;
}
public void OnLocationChanged(Location location) { //LocationListener
if( mapLocationListener != null ) {
mapLocationListener.onLocationChanged(location);
double lat = location.getLatitude();
double lon = location.getLongitude();
Log.v("TAG", "i was here");
}
}
@Override
public void onProviderDisabled(String provider) { //LocationListener
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) { //LocationListener
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}