如何获取Google Maps Android API v2中的当前位置?

时间:2012-12-07 02:56:32

标签: android google-maps

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。

13 个答案:

答案 0 :(得分:56)

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。

答案 1 :(得分:31)

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 40932Issue 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。

答案 2 :(得分:19)

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());

答案 3 :(得分:3)

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);

}

答案 4 :(得分:2)

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......

答案 5 :(得分:1)

您是否尝试过GoogleMap.getMyLocation()

答案 6 :(得分:1)

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

答案 7 :(得分:1)

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.
}

答案 8 :(得分:0)

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();

}

答案 9 :(得分:0)

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));

答案 10 :(得分:0)

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"得到我的位置"图层按钮,然后它将不会获得空值。

答案 11 :(得分:0)

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:

  1. 在地图活动中实现所有这些

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

  2. onCreate

    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();
    }
    
  3. onConnected

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

    @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();
    }
    
  5. 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);
    }
    }
    
  6. 这是非常快速,顺畅和有效的。希望这有帮助

答案 12 :(得分:0)

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。