[Android] [Google地图]：获取触摸位置的地址

Question

我一直在谷歌搜索这几个小时但到目前为止没有运气。

我想获取触摸/点按地图的位置的地址。

据我所知，为了获得地址，我需要反转地理编码坐标。但是我如何从地图中获取坐标呢？

Answer 1

您需要做的就是设置OnMapClickListener，然后onMapClick()覆盖会为您提供LatLng个对象。然后，使用Geocoder对象获取刚刚单击的点的地址。

在这个简单的例子中，每次用户点击地图上的新点时，我都会添加一个标记。

以下是您需要的主要功能：

mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {

        @Override
        public void onMapClick(LatLng point) {
            //save current location
            latLng = point;

            List<Address> addresses = new ArrayList<>();
            try {
                addresses = geocoder.getFromLocation(point.latitude, point.longitude,1);
            } catch (IOException e) {
                e.printStackTrace();
            }

            android.location.Address address = addresses.get(0);

            if (address != null) {
                StringBuilder sb = new StringBuilder();
                for (int i = 0; i < address.getMaxAddressLineIndex(); i++){
                    sb.append(address.getAddressLine(i) + "\n");
                }
                Toast.makeText(MapsActivity.this, sb.toString(), Toast.LENGTH_LONG).show();
            }

            //remove previously placed Marker
            if (marker != null) {
                marker.remove();
            }

            //place marker where user just clicked
            marker = mMap.addMarker(new MarkerOptions().position(point).title("Marker")
                    .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA)));

        }
    });

以下是我用来测试它的完整课程：

public class MapsActivity extends AppCompatActivity {

    private GoogleMap mMap;
    private LatLng latLng;
    private Marker marker;
    Geocoder geocoder;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);

        geocoder = new Geocoder(this, Locale.getDefault());

        setUpMapIfNeeded();
    }

    @Override
    protected void onResume() {
        super.onResume();
        setUpMapIfNeeded();
    }

    private void setUpMapIfNeeded() {
        // Do a null check to confirm that we have not already instantiated the map.
        if (mMap == null) {
            // Try to obtain the map from the SupportMapFragment.
            mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
                    .getMap();
            // Check if we were successful in obtaining the map.
            if (mMap != null) {
                setUpMap();
            }
        }
    }

    private void setUpMap() {

        mMap.setMyLocationEnabled(true);
        mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
        mMap.getUiSettings().setMapToolbarEnabled(false);

        mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {

            @Override
            public void onMapClick(LatLng point) {
                //save current location
                latLng = point;

                List<Address> addresses = new ArrayList<>();
                try {
                    addresses = geocoder.getFromLocation(point.latitude, point.longitude,1);
                } catch (IOException e) {
                    e.printStackTrace();
                }

                android.location.Address address = addresses.get(0);

                if (address != null) {
                    StringBuilder sb = new StringBuilder();
                    for (int i = 0; i < address.getMaxAddressLineIndex(); i++){
                        sb.append(address.getAddressLine(i) + "\n");
                    }
                    Toast.makeText(MapsActivity.this, sb.toString(), Toast.LENGTH_LONG).show();
                }

                //remove previously placed Marker
                if (marker != null) {
                    marker.remove();
                }

                //place marker where user just clicked
                marker = mMap.addMarker(new MarkerOptions().position(point).title("Marker")
                        .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA)));

            }
        });

    }
}

在两个不同点点击地图的结果：

Answer 2

Google地图有回调来执行like this one或this one。

只需在代码中实现它们，一旦它们被解雇，只需对坐标进行反向地理编码即可。你实际上发现了最复杂的部分（你知道你需要反转地理编码）。