如何在Android应用程序中显示一个地方的位置

Question

我正在寻找一种方法来显示Android应用程序内的位置。我有存储在MySQL数据库中的地方的经度和纬度坐标，现在我想检索它们（经度和纬度）并显示应用程序中的确切位置。谢谢

Answer 1

我假设你想要一个带标记的地图视图。

<fragment
    android:id="@+id/map"
    android:layout_width="match_parent"
    android:layout_height="200dp"
    class="com.google.android.gms.maps.MapFragment" />

这应该添加到您希望Map所在的活动的xml文件中。然后在您的活动中，

GoogleMap googleMap;
MapFragment mapFragment;

在你的onCreate中初始化这个;

mapFragment = (MapFragment) getFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(this);

然后创建覆盖方法onMapReady()

@Override
public void onMapReady(GoogleMap gMap) {
    googleMap = gMap;
    googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
    try {
        googleMap.setMyLocationEnabled(true);
    } catch (SecurityException se) {

    }

    //Edit the following as per you needs
    googleMap.setTrafficEnabled(true);
    googleMap.setIndoorEnabled(true);
    googleMap.setBuildingsEnabled(true);
    googleMap.getUiSettings().setZoomControlsEnabled(true);
    //

    LatLng placeLocation = new LatLng(***YOUR LAT***, ***YOUR LNG***); //Make them global
    Marker placeMarker = googleMap.addMarker(new MarkerOptions().position(placeLocation)
                  .title(***NAME OF PLACE HERE***));
    googleMap.moveCamera(CameraUpdateFactory.newLatLng(placeLocation));
    googleMap.animateCamera(CameraUpdateFactory.zoomTo(10), 1000, null);
}

我认为应该给你你想要的东西。如果您还需要其他任何评论。

Answer 2

要使用纬度和经度获取位置详细信息，请使用以下代码

Geocoder geocoder;
List<Address> addresses;
geocoder = new Geocoder(this, Locale.getDefault());

addresses = geocoder.getFromLocation(latitude, longitude, 1); // Here 1 represent max location result to returned, by documents it recommended 1 to 5

String address = addresses.get(0).getAddressLine(0); // If any additional address line present than only, check with max available address lines by getMaxAddressLineIndex()
String city = addresses.get(0).getLocality();
String state = addresses.get(0).getAdminArea();
String country = addresses.get(0).getCountryName();
String postalCode = addresses.get(0).getPostalCode();
String knownName = addresses.get(0).getFeatureName(); // Only if available else return NULL

Answer 3

            //Add mapView  activity.xml
            <com.google.android.maps.MapView
                        android:id="@+id/map_view"
                        android:layout_width="fill_parent"
                        android:layout_height="fill_parent"
                        android:apiKey="your api key"

                        android:clickable="true"
                        android:layout_below="@id/tv_location" />

        //Add Activity
         // Getting reference to MapView
                mapView = (MapView) findViewById(R.id.map_view);
                googleMap = mapView.getMap();

    final LatLng latLng = new LatLng(lat, lng);
            final MarkerOptions markerOptions = new MarkerOptions().icon(BitmapDescriptorFactory.fromResource(R.drawable.map_pin));
            final CameraPosition cameraPosition = new CameraPosition.Builder().target(latLng).zoom(14f).tilt(70).build();
            markerOptions.position(latLng);
 googleMap.addMarker(markerOptions);

Answer 4

    Geocoder coder = new Geocoder(this);
    String locationName = list.get(i);
    Geocoder gc = new Geocoder(this);
    List<Address> addressList = null;
    try {
        addressList = coder.getFromLocationName(locationName, 1);
    } catch (IOException e) {
        e.printStackTrace();
    }
    Address location = addressList.get(0);
    double latitude = location.getLatitude();
    double longitude = location.getLongitude();
    LatLng helpcenter = new LatLng(latitude, longitude);
    googleMap.addMarker(new MarkerOptions().position(helpcenter)
            .title(list.get(i)));
    mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(helpcenter, 6f));