android– 缩放显示的当前用户位置

概述我正在使用GoogleMapsforAndroidv2.我想显示当前用户位置并放大它.这是FragmentActivity中的代码：@OverrideprotectedvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.map_activity);mMap=((Sup

我正在使用Google Maps for Android v2.我想显示当前用户位置并放大它.
这是FragmentActivity中的代码：

@OverrIDeprotected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.map_activity);    mMap = ((SupportMapFragment) getSupportFragmentManager()            .findFragmentByID(R.ID.mapFragment_mapActivity)).getMap();    if (mMap == null) {        Toast.makeText(this, R.string.mapCreationProblem, Toast.LENGTH_LONG)                .show();        finish();        return;    }    mMap.setMyLocationEnabled(true);    Location currentLocation = mMap.getMyLocation();    if(currentLocation!=null){       LatLng currentCoordinates = new LatLng(                            currentLocation.getLatitude(),                            currentLocation.getLongitude());       mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(currentCoordinates, 10));    }}

地图工作正常,当前位置的蓝点也可以工作.但似乎currentLocation始终为null.所以我无法放大当前位置.

谁知道为什么,拜托？

解决方法:

以下是getMyLocation()的实现,其中包含用于查找人员位置的附加保护.我只是在管理地图片段的活动中有这个.

private Location getMyLocation() {    // Get location from GPS if it's available    LocationManager lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);    Location myLocation = lm.getLastKNownLocation(LocationManager.GPS_PROVIDER);    // Location wasn't found, check the next most accurate place for the current location    if (myLocation == null) {        Criteria criteria = new Criteria();        criteria.setAccuracy(Criteria.ACCURACY_COARSE);        // Finds a provIDer that matches the criteria        String provIDer = lm.getBestProvIDer(criteria, true);        // Use the provIDer to get the last kNown location        myLocation = lm.getLastKNownLocation(provIDer);    }    return myLocation;}

谢谢,
DMAN

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