Question

使用

mMap.setMyLocationEnabled(true)

可以设置myLocation图层启用但问题是当用户点击按钮时如何获取myLocation？我想得到经度和纬度。

Answer 1

Google Maps API位置现在可以使用，即使有听众，您也可以使用它，例如：

private GoogleMap.OnMyLocationChangeListener myLocationChangeListener = new GoogleMap.OnMyLocationChangeListener() {
    @Override
    public void onMyLocationChange(Location location) {
        LatLng loc = new LatLng(location.getLatitude(), location.getLongitude());
        mMarker = mMap.addMarker(new MarkerOptions().position(loc));
        if(mMap != null){
            mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(loc, 16.0f));
        }
    }
};

然后设置地图的监听器：

mMap.setOnMyLocationChangeListener(myLocationChangeListener);

当地图首次找到位置时，将调用此方法。

根本不需要LocationService或LocationManager。

不推荐使用
OnMyLocationChangeListener接口。请改用com.google.android.gms.location.FusedLocationProviderApi。 FusedLocationProviderApi提供改进的定位和功率使用，并由“我的位置”蓝点使用。请参阅示例应用程序文件夹中的MyLocationDemoActivity，例如示例代码或Location Developer Guide。

Answer 2

目前，GoogleMap.getMyLocation（）始终在每种情况下都返回null。

目前有两个针对Google的错误报告，我知道，Issue 40932和Issue 4644。

实现之前提到的LocationListener是不正确的，因为LocationListener将与您尝试使用的新API中的LocationOverlay不同步。

按照Vomodla网站上的教程，由Pramod J George先前链接，将为您提供旧版Google Maps API的说明。

所以我很抱歉没有给你一个通过这种方式检索你的位置的方法。目前，locationListener可能是唯一的方法，但我确信谷歌正在努力解决新API中的问题。

也很抱歉没有发布更多链接，StackOverlow认为我是垃圾邮件，因为我没有代表。

---- 2013年2月4日更新----

Google已声明此问题将通过Issue 4644在Google Maps API的下一次更新中修复。我不确定何时会发生更新，但一旦完成，我将再次编辑此帖子。

---- 2013年4月10日更新----

Google已声明此问题已通过Issue 4644修复。它现在应该工作。

Answer 3

试试这个

LocationManager service = (LocationManager) getSystemService(LOCATION_SERVICE);
Criteria criteria = new Criteria();
String provider = service.getBestProvider(criteria, false);
Location location = service.getLastKnownLocation(provider);
LatLng userLocation = new LatLng(location.getLatitude(),location.getLongitude());

Answer 4

确保已打开设备上的位置服务。否则，您将无法获得任何与位置相关的信息。

这对我有用，

    map = ((MapFragment)getFragmentManager().findFragmentById(R.id.map)).getMap();
    map.setMyLocationEnabled(true);
    GoogleMap.OnMyLocationChangeListener myLocationChangeListener = new GoogleMap.OnMyLocationChangeListener() {
        @Override
        public void onMyLocationChange (Location location) {
           LatLng loc = new LatLng (location.getLatitude(), location.getLongitude());
           map.animateCamera(CameraUpdateFactory.newLatLngZoom(loc, 16.0f));
        }
    };
    map.setOnMyLocationChangeListener(myLocationChangeListener);

}

Answer 5

要在用户点击按钮时获取该位置，请在onClick-中调用此方法

void getCurrentLocation() {
    Location myLocation  = mMap.getMyLocation();
    if(myLocation!=null)
    {
        double dLatitude = myLocation.getLatitude();
        double dLongitude = myLocation.getLongitude();
        Log.i("APPLICATION"," : "+dLatitude);
        Log.i("APPLICATION"," : "+dLongitude);
        mMap.addMarker(new MarkerOptions().position(
                new LatLng(dLatitude, dLongitude)).title("My Location").icon(BitmapDescriptorFactory.fromBitmap(Utils.getBitmap("pointer_icon.png"))));
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(dLatitude, dLongitude), 8));

    }
    else
    {
        Toast.makeText(this, "Unable to fetch the current location", Toast.LENGTH_SHORT).show();
    }

}

还要确保

setMyLocationEnabled

设置为 true 。

试试看是否有效......

Answer 6

您是否尝试过GoogleMap.getMyLocation()？

Answer 7

我刚刚发现这段代码片段简单实用，试试：

public class MainActivity extends ActionBarActivity implements
    ConnectionCallbacks, OnConnectionFailedListener {
...
@Override
public void onConnected(Bundle connectionHint) {
    mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
            mGoogleApiClient);
    if (mLastLocation != null) {
        mLatitudeText.setText(String.valueOf(mLastLocation.getLatitude()));
        mLongitudeText.setText(String.valueOf(mLastLocation.getLongitude()));
    }
}}

这里是教程的链接：Getting the Last Known Location

Answer 8

试试这个

if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
                == PackageManager.PERMISSION_GRANTED) {
    mMap.setMyLocationEnabled(true);
} else {
    // Show rationale and request permission.
}

Answer 9

试试这个

public class MyLocationListener implements LocationListener
{

 @Override

public void onLocationChanged(Location loc)
{

loc.getLatitude();

loc.getLongitude();

String Text = “My current location is: ” +

“Latitud = ” + loc.getLatitude() +

“Longitud = ” + loc.getLongitude();

Toast.makeText( getApplicationContext(),Text,   Toast.LENGTH_SHORT).show();



tvlat.setText(“”+loc.getLatitude());

tvlong.setText(“”+loc.getLongitude());

this.gpsCurrentLocation();

}

Answer 10

它会给出当前位置。

mMap.setMyLocationEnabled(true);
Location userLocation = mMap.getMyLocation();
        LatLng myLocation = null;
        if (userLocation != null) {
            myLocation = new LatLng(userLocation.getLatitude(),
                    userLocation.getLongitude());
            mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(myLocation,
                    mMap.getMaxZoomLevel()-5));

Answer 11

只有一个条件，我测试过它不是空的，如果你有足够的时间让用户触摸＆＃34;得到我的位置＆＃34;图层按钮，然后它将不会获得空值。

Answer 12

接受的答案有效，但现在已经弃用了一些使用过的方法，所以我认为最好用更新的方法回答这个问题。

答案完全来自this tutorial

所以这里是一步一步的指南：

在地图活动中实现所有这些

MapActivity extends FragmentActivity implements OnMapReadyCallback, GoogleApiClient.OnConnectionFailedListener, GoogleApiClient.ConnectionCallbacks

在onCreate：

中

private GoogleMap mMap;
private Context context;
private TextView txtStartPoint,txtEndPoint;
private GoogleApiClient mGoogleApiClient;
private Location mLastKnownLocation;
private LatLng mDefaultLocation;
private CameraPosition mCameraPosition;
private boolean mLocationPermissionGranted;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
context = this;
mGoogleApiClient = new GoogleApiClient.Builder(this)
        .enableAutoManage(this /* FragmentActivity */,
                this /* OnConnectionFailedListener */)
        .addConnectionCallbacks(this)
        .addApi(LocationServices.API)
        .addApi(Places.GEO_DATA_API)
        .addApi(Places.PLACE_DETECTION_API)
        .build();
mGoogleApiClient.connect();
}

在onConnected：

中

SupportMapFragment mapFragment = (SupportMapFragment)     getSupportFragmentManager()
        .findFragmentById(map);
mapFragment.getMapAsync(this);

在onMapReady：

中

@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;

// Do other setup activities here too, as described elsewhere in this tutorial.

// Turn on the My Location layer and the related control on the map.
updateLocationUI();

// Get the current location of the device and set the position of the map.
getDeviceLocation();
}

这两个是onMapReady中的方法：

private void updateLocationUI() {
  if (mMap == null) {
    return;
}

if (ContextCompat.checkSelfPermission(this.getApplicationContext(),
        android.Manifest.permission.ACCESS_FINE_LOCATION)
        == PackageManager.PERMISSION_GRANTED) {
    mLocationPermissionGranted = true;
}

if (mLocationPermissionGranted) {
    mMap.setMyLocationEnabled(true);
    mMap.getUiSettings().setMyLocationButtonEnabled(true);
} else {
    mMap.setMyLocationEnabled(false);
    mMap.getUiSettings().setMyLocationButtonEnabled(false);
    mLastKnownLocation = null;
}
}

private void getDeviceLocation() {
if (ContextCompat.checkSelfPermission(this.getApplicationContext(),
        android.Manifest.permission.ACCESS_FINE_LOCATION)
        == PackageManager.PERMISSION_GRANTED) {
    mLocationPermissionGranted = true;
}

if (mLocationPermissionGranted) {
    mLastKnownLocation = LocationServices.FusedLocationApi
            .getLastLocation(mGoogleApiClient);
}

// Set the map's camera position to the current location of the device.
float DEFAULT_ZOOM = 15;
if (mCameraPosition != null) {
    mMap.moveCamera(CameraUpdateFactory.newCameraPosition(mCameraPosition));
} else if (mLastKnownLocation != null) {
    mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(
            new LatLng(mLastKnownLocation.getLatitude(),
                    mLastKnownLocation.getLongitude()), DEFAULT_ZOOM));
} else {
    Log.d("pouya", "Current location is null. Using defaults.");
    mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(mDefaultLocation, DEFAULT_ZOOM));
    mMap.getUiSettings().setMyLocationButtonEnabled(false);
}
}

这是非常快速，顺畅和有效的。希望这有帮助

Answer 13

我宁愿使用FusedLocationApi，因为OnMyLocationChangeListener已被弃用。

首先声明这三个变量：

private LocationRequest  mLocationRequest;
private GoogleApiClient  mGoogleApiClient;
private LocationListener mLocationListener;

定义方法：

private void initGoogleApiClient(Context context)
{
    mGoogleApiClient = new GoogleApiClient.Builder(context).addApi(LocationServices.API).addConnectionCallbacks(new GoogleApiClient.ConnectionCallbacks()
    {
        @Override
        public void onConnected(Bundle bundle)
        {
            mLocationRequest = LocationRequest.create();
            mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
            mLocationRequest.setInterval(1000);

            setLocationListener();
        }

        @Override
        public void onConnectionSuspended(int i)
        {
            Log.i("LOG_TAG", "onConnectionSuspended");
        }
    }).build();

    if (mGoogleApiClient != null)
        mGoogleApiClient.connect();

}

private void setLocationListener()
{
    mLocationListener = new LocationListener()
    {
        @Override
        public void onLocationChanged(Location location)
        {
            String lat = String.valueOf(location.getLatitude());
            String lon = String.valueOf(location.getLongitude());
            Log.i("LOG_TAG", "Latitude = " + lat + " Longitude = " + lon);
        }
    };

    LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, mLocationListener);
}

private void removeLocationListener()
{
    LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, mLocationListener);
}

initGoogleApiClient()用于初始化GoogleApiClient对象
setLocationListener()用于设置位置更改侦听器
removeLocationListener()用于删除侦听器

调用initGoogleApiClient方法启动代码工作:)不要忘记在最后删除侦听器（mLocationListener）以避免内存泄漏问题。

如何获取Google Maps Android API v2中的当前位置？

13 个答案: