如何在android中的地图上显示当前位置标记？
Posted
技术标签:
【中文标题】如何在android中的地图上显示当前位置标记？【英文标题】：How to show current position marker on Map in android? 【发布时间】：2014-04-23 15:30:18 【问题描述】：我正在开发一个应用程序，我想在我的地图中使用标记显示当前位置。我正在使用谷歌地图 v2。在这里我可以在 GPS 关闭时显示地图和标记，但在 GPS 开启时在地图上看不到任何标记。我的要求是在当前位置的地图上显示标记
我试过这样，
@Override
public void onLocationChanged(Location location)
// TODO Auto-generated method stub
//locationManger.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0,
this);
ArrayList<HashMap<String, String>> arl = (ArrayList<HashMap<String, String>>)
getIntent().getSerializableExtra("arrayList");
if(location!=null)
double latitude = location.getLatitude();
double langitude = location.getLongitude();
myPosition = new LatLng(latitude, langitude);
CameraPosition position= new CameraPosition.Builder().
target(myPosition).zoom(17).bearing(19).tilt(30).build();
//_googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(position));
_googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(position));
_googleMap.addMarker(new
MarkerOptions().position(myPosition).title("start"));
【问题讨论】：
【参考方案1】：使用下面对我有用的代码：
@Override
public void onLocationChanged(Location location)
map.clear();
MarkerOptions mp = new MarkerOptions();
mp.position(new LatLng(location.getLatitude(), location.getLongitude()));
mp.title("my position");
map.addMarker(mp);
map.animateCamera(CameraUpdateFactory.newLatLngZoom(
new LatLng(location.getLatitude(), location.getLongitude()), 16));
【讨论】：
不适合我。实际上问题是它可以在 2.3 设备上运行，但它不能在 4.2 设备上运行【参考方案2】：试试这个，它显示的是当前位置：
private void initilizeMap()
if (googleMap == null)
googleMap = ((MapFragment) getFragmentManager().findFragmentById(
R.id.map)).getMap();
// to set current location
googleMap.setMyLocationEnabled(true);
// check if map is created successfully or not
if (googleMap == null)
Toast.makeText(getApplicationContext(),
"Sorry! unable to create maps", Toast.LENGTH_SHORT)
.show();
【讨论】：
【参考方案3】：试试这个：-
private void initMap()
if (googleMap != null)
googleMap = ((MapFragment) getFragmentManager().findFragmentById(
R.id.map)).getMap();
// to set current location
googleMap.setMyLocationEnabled(true);
Marker pos_Marker = googleMap.addMarker(new MarkerOptions().position(starting).icon(BitmapDescriptorFactory.fromResource(R.drawable.ic_laumcher)).title("Starting Location").draggable(false));
pos_Marker.showInfoWindow();
googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(START_locationpoint, 10));
googleMap.animateCamera(CameraUpdateFactory.zoomTo(15),2000, null);
// check if map is created successfully or not
if (googleMap == null)
Toast.makeText(getApplicationContext(),
"Sorry! unable to create maps", Toast.LENGTH_SHORT)
.show();
【讨论】：
不适合我。实际上问题是它可以在 2.3 设备上运行，但它不能在 4.2 设备上运行—— sry 我发现了这个问题。如果标记上的 gps 不显示。但是标记上的 gps 显示。为什么？请告诉我【参考方案4】：使用这个。它对我有用。
@Override
public void onLocationChanged(Location location)
map.clear();
mp1 = new MarkerOptions();
mp1.position(new LatLng(location.getLatitude(),
location.getLongitude()));
mp1.draggable(true);
mp1.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_ROSE));
map.addMarker(mp1);
map.animateCamera(CameraUpdateFactory.newLatLngZoom(
new LatLng(location.getLatitude(), location
.getLongitude()), 20));
【讨论】：
【参考方案5】：你可以试试这个：
public class MapsActivity extends AppCompatActivity
implements OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener
GoogleMap mGoogleMap;
SupportMapFragment mapFrag;
LocationRequest mLocationRequest;
GoogleApiClient mGoogleApiClient;
Location mLastLocation;
Marker mCurrLocationMarker;
private Circle mCircle;
double radiusInMeters = 100.0;
int strokeColor = 0xffff0000; //Color Code you want
int shadeColor = 0x44ff0000; //opaque red fill
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
getSupportActionBar().setTitle("Map Location Activity");
mapFrag = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFrag.getMapAsync(this);
@Override
public void onPause()
super.onPause();
//stop location updates when Activity is no longer active
if (mGoogleApiClient != null)
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
@Override
public void onMapReady(GoogleMap googleMap)
mGoogleMap=googleMap;
//mGoogleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
//Initialize Google Play Services
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED)
//Location Permission already granted
buildGoogleApiClient();
mGoogleMap.setMyLocationEnabled(true);
else
//Request Location Permission
checkLocationPermission();
else
buildGoogleApiClient();
mGoogleMap.setMyLocationEnabled(true);
protected synchronized void buildGoogleApiClient()
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
@Override
public void onConnected(Bundle bundle)
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(1000);
mLocationRequest.setFastestInterval(1000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED)
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
@Override
public void onConnectionSuspended(int i)
@Override
public void onConnectionFailed(ConnectionResult connectionResult)
@Override
public void onLocationChanged(Location location)
mLastLocation = location;
if (mCurrLocationMarker != null)
mCurrLocationMarker.remove();
//Place current location marker
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title("Current Position");
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
mCurrLocationMarker = mGoogleMap.addMarker(markerOptions);
CircleOptions addCircle = new CircleOptions().center(latLng).radius(radiusInMeters).fillColor(shadeColor).strokeColor(strokeColor).strokeWidth(8);
mCircle = mGoogleMap.addCircle(addCircle);
//move map camera
mGoogleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mGoogleMap.animateCamera(CameraUpdateFactory.zoomTo(11));
//stop location updates
if (mGoogleApiClient != null)
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
private void checkLocationPermission()
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED)
// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.ACCESS_FINE_LOCATION))
// Show an explanation to the user *asynchronously* -- don't block
// this thread waiting for the user's response! After the user
// sees the explanation, try again to request the permission.
new AlertDialog.Builder(this)
.setTitle("Location Permission Needed")
.setMessage("This app needs the Location permission, please accept to use location functionality")
.setPositiveButton("OK", new DialogInterface.OnClickListener()
@Override
public void onClick(DialogInterface dialogInterface, int i)
//Prompt the user once explanation has been shown
ActivityCompat.requestPermissions(MapsActivity.this,
new String[]Manifest.permission.ACCESS_FINE_LOCATION,
MY_PERMISSIONS_REQUEST_LOCATION );
)
.create()
.show();
else
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(this,
new String[]Manifest.permission.ACCESS_FINE_LOCATION,
MY_PERMISSIONS_REQUEST_LOCATION );
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults)
switch (requestCode)
case MY_PERMISSIONS_REQUEST_LOCATION:
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED)
// permission was granted, yay! Do the
// location-related task you need to do.
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED)
if (mGoogleApiClient == null)
buildGoogleApiClient();
mGoogleMap.setMyLocationEnabled(true);
else
// permission denied, boo! Disable the
// functionality that depends on this permission.
Toast.makeText(this, "permission denied", Toast.LENGTH_LONG).show();
return;
// other 'case' lines to check for other
// permissions this app might request
【讨论】：
这是一个很好的解决方案【参考方案6】： Location mlocation;
@Override
public void onLocationChanged(Location location)
// Add a marker in Sydney and move the camera
mLocation = location;
LatLng myLocation = new LatLng(mLocation.getLatitude(), mLocation.getLongitude());
mMap.addMarker(new MarkerOptions()
.position(myLocation)
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED))
.title("My Location"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(myLocation));
Log.d("location", "Latitude:" + mLocation.getLatitude() + "\n" + "Longitude:" + mLocation.getLongitude());
【讨论】：
【参考方案7】：要获取当前位置，您可以在 LocationManager 上使用 getLastKnownLocation() 方法：
locationManager = (LocationManager) getActivity().getSystemService(getActivity().LOCATION_SERVICE);
Location currentLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
LatLng current = new LatLng(currentLocation.getLatitude(), currentLocation.getLongitude());
googleMap.addMarker(new MarkerOptions().position(current).title("Marker Label").snippet("Marker Description"));
CameraPosition cameraPosition = new CameraPosition.Builder().target(current).zoom(14).build();
googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
【讨论】：
【参考方案8】：mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener()
@Override
public void onMapClick(LatLng latLng)
float lat = (float) latLng.latitude;
float lon = (float) latLng.longitude;
mMap.clear();
mMap.addMarker(new MarkerOptions().position(latLng).title("Marker in " + lat +" "+ lon));
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
);
【讨论】：
此答案出现在 SO 中的低质量帖子中，因为它是仅代码答案。您能否为您的答案添加一些解释？解释你的逻辑，并对你的代码打算做什么做一点评论。不仅对 OP 有所帮助，而且还可以作为未来用户的评论。 From Review.以上是关于如何在android中的地图上显示当前位置标记？的主要内容，如果未能解决你的问题，请参考以下文章
如何在 Android 的 MapView 中更新当前位置的蓝点标记
如何在android中的谷歌地图上绘制路线并计算多个标记之间的距离
应用程序启动地图活动后，如何在 android 的地图中显示我的当前位置