[英]google map not showing current location in andorid?
我想在google map上显示用户的当前位置,但截至目前我还无法显示location.I片段,我正在其中编写代码。
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fragment_home, container, false);
initGamp(rootView);
// Inflate the layout for this fragment
return rootView;
}
initgmap函数
public void initGamp(View root) {
SupportMapFragment mapFragment = (SupportMapFragment) getChildFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
// check if map is created successfully or not
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
// Add a marker in Sydney, Australia, and move the camera.
// LatLng sydney = new LatLng(-34, 151);
// mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
// mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
if (ActivityCompat.checkSelfPermission(getActivity().getApplicationContext(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getActivity().getApplicationContext(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
Log.i("MAP","BEFORE LOCATION");
mMap.setMyLocationEnabled(true);
mMap.getUiSettings().setMyLocationButtonEnabled(true);
Log.i("MAP", "AFTER LOCATION");
LocationManager locationManager = (LocationManager) getActivity().getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
String bestProvider = locationManager.getBestProvider(criteria, true);
Location location = locationManager.getLastKnownLocation(bestProvider);
if (location != null) {
Toast.makeText(getActivity().getApplicationContext(),"not null",Toast.LENGTH_SHORT).show();
onLocationChanged(location);
}
locationManager.requestLocationUpdates(bestProvider, 20, 0, this);
Log.i("MAP", "END LOCATION");
}
@Override
public void onLocationChanged(Location location) {
Log.i("MAP","CHANGE LOCATION");
Toast.makeText(getActivity().getApplicationContext(),"chnage",Toast.LENGTH_SHORT).show();
mMap.clear();
double latitude = location.getLatitude();
double longitude = location.getLongitude();
LatLng latLng = new LatLng(latitude, longitude);
mMap.addMarker(new MarkerOptions().position(latLng));
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.animateCamera(CameraUpdateFactory.zoomTo(15));
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
所有权限:
<!-- Required to show current location -->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.CALL_PHONE" />
上面的代码我已经用来显示位置,但是我无法正常工作。我也点击了当前位置按钮,但我仍然无法获得当前位置。
这里的关键是要等到onMapReady()
回调发生后再请求位置更新。 一旦在MapFragment
或MapView
对象上设置了此接口的实例,便可以在准备使用地图时触发onMapReady(GoogleMap)
方法,并提供一个非null的GoogleMap
实例。
这是完成您所需功能的完整活动代码。 在活动加载时,然后在每个位置更改事件发生时,注册一个位置侦听器。
这是示例活动代码:
public class MainActivity extends AppCompatActivity implements
OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener {
LocationRequest mLocationRequest;
GoogleApiClient mGoogleApiClient;
LatLng latLng;
GoogleMap mGoogleMap;
SupportMapFragment mFragment;
Marker currLocationMarker;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mFragment.getMapAsync(this);
}
@Override
public void onMapReady(GoogleMap gMap) {
mGoogleMap = gMap;
mGoogleMap.setMyLocationEnabled(true);
buildGoogleApiClient();
mGoogleApiClient.connect();
}
protected synchronized void buildGoogleApiClient() {
Toast.makeText(this,"buildGoogleApiClient",Toast.LENGTH_SHORT).show();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
@Override
public void onConnect
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