我正在使用适用于Android v2的Google Maps。我想显示当前用户位置并放大它。这是FragmentActivity
中的代码:
@Override
protected 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,当前位置上的蓝点也工作正常。但似乎currentLocation
总是空的。所以我无法缩放当前位置。
请问谁知道为什么?
下面是 getMyLocation() 的实现,增加了对查找人员位置的保护。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;
}
谢谢迪曼
尝试使用位置管理器:
LocationManager manager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Location currentLocation = manager.getLastKnownLocation(LocationManager.GPS_PROVIDER);