所以我浏览了一下在Google地图上绘制路线的示例。然而，我的障碍是我必须去url / route.coords才能获得路线的纬度和路线。当我手动转到该URL时，它会下载包含所有路径信息的文本文件。因此，如果有人可以帮助我从哪里开始，将不胜感激。我已经在地图上显示了您当前位置的点以及其他一些类别。我的最终目标是为每个驱动器绘制不同颜色的路径，每个驱动器都有其特定的URL。
我要展示Google地图的片段：
public class ThirdFragment extends Fragment implements OnMapReadyCallback {
View myView;
private GoogleMap mMap;
MapFragment mapFrag;
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
myView = inflater.inflate(R.layout.third_layout, container, false);
return myView;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
mapFrag = (MapFragment) getChildFragmentManager().findFragmentById(R.id.map);
mapFrag.getMapAsync(this);
//mapFrag.onResume();
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED || ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
mMap.setMyLocationEnabled(true);
Criteria criteria = new Criteria();
LocationManager locationManager = (LocationManager)getActivity().getSystemService(Context.LOCATION_SERVICE);
String provider = locationManager.getBestProvider(criteria, false);
Location location = locationManager.getLastKnownLocation(provider);
double lat = location.getLatitude();
double lng = location.getLongitude();
LatLng coordinate = new LatLng(lat, lng);
CameraUpdate yourLocation = CameraUpdateFactory.newLatLngZoom(coordinate, 13);
mMap.animateCamera(yourLocation);
} else {
final AlertDialog alertDialogGPS = new AlertDialog.Builder(getActivity()).create();
alertDialogGPS.setTitle("Info");
alertDialogGPS.setMessage("Looks like you have not given GPS permissions. Please give GPS permissions and return back to the app.");
alertDialogGPS.setIcon(android.R.drawable.ic_dialog_alert);
alertDialogGPS.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Intent intentSettings = new Intent(Settings.ACTION_APPLICATION_SETTINGS);
startActivity(intentSettings);
alertDialogGPS.dismiss();
}
});
alertDialogGPS.show();
}
}
@Override
public void onResume() {
super.onResume();
if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED || ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
mapFrag.getMapAsync(this);
}
else {
}
}
}
RouteCoord.java
public class RouteCoord {
private String lat, dist, lng, speed, index;
public String getLat() {
return lat;
}
public void setLat(String lat) {this.lat = lat;}
public String getLng(){return lng;}
public void setLng(String lng) {this.lng = lng;}
}
RouteAdapter.java
public class RouteAdapter extends ArrayAdapter<Map.Entry> {
private final Activity context;
// you may need to change List to something else (whatever is returned from drives.entrySet())
private final List<Map.Entry> drives;
public static String DriveURL;
public static String routeLat;
public static String routeLng;
SharedPreferences sharedPref;
// may also need to change List here (above comment)
public RouteAdapter(Activity context, List<Map.Entry> drives) {
super(context, R.layout.drive_url_list, drives);
this.context = context;
this.drives = drives;
sharedPref = context.getPreferences(Context.MODE_PRIVATE);
}
@Override
public View getView(int position, View view, ViewGroup parent) {
LayoutInflater inflater = context.getLayoutInflater();
View rowView = inflater.inflate(R.layout.third_layout, null, true);
Map.Entry drive = this.drives.get(position);
// position is the index of the drives.entrySet() array
int driveNum = position + 1;
// need to import your Route class
Route route = (Route) drive.getValue();
RouteCoord routeCoord = (RouteCoord) drive.getValue();
routeLat = routeCoord.getLat();
routeLng = routeCoord.getLng();
// need to import your URL class
DriveURL = route.getUrl();
return rowView;
}
}
答案 0 :(得分：1)
You need to draw a Polyline on the Google Map using the coordinates of the route.
See below sample code:
/**
* To show map with this activity add ORIGIN, DESTINATION lat double arrays in
* intent.
*
* </br> For specifying origin, put latitude and longitude in an array of double
* with key = {@link #ORIGIN} in the intent </br >For specifying destination,
* put latitude and longitude in an array of double with key =
* {@link #DESTINATION} in the intent
*
* @author Shridutt.Kothari
*
*/
public class MapsActivity extends BaseActivity {
private static final String TAG = "MapsActivity";
/**
* String key for specifying array of long containing origin latitude and
* longitude .
*/
public static final String ORIGIN = "ORIGIN";
private double[] destinationLocation;
private GoogleMap map;
private PathUpdateReceiver pathUpdateReceiver;
private PolylineOptions lineOptions;
private Marker marker;
private MarkerOptions ambulanceMarkerOption;
private Polyline polyline;
private List<LatLng> points;
private static final int ZOOM_LEVEL = 15;
private static final int POLYLINE_WIDTH = 5;
private static final String AMBULANCE_MARKER_NAME = "Ambulance";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
// Intent launchIntent = getIntent();
// originLocation = new double[2];
// originLocation = launchIntent.getDoubleArrayExtra(ORIGIN);
// originLocation[0] = 28.628525;
// originLocation[1] = 77.22219016666666;
destinationLocation = new double[2];
map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map))
.getMap();
if (null == map) {
try {
MapsInitializer.initialize(getApplicationContext());
} catch (Exception e) {
Toast.makeText(getApplicationContext(),
"Google play services not available, can't show map!",
Toast.LENGTH_LONG).show();
e.printStackTrace();
this.finish();
}
}
}
@Override
protected void onResume() {
super.onResume();
if (null == pathUpdateReceiver) {
pathUpdateReceiver = new PathUpdateReceiver();
}
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(AppConstants.VEHICLE_DATA_SAMPLE_ID);
registerReceiver(pathUpdateReceiver, intentFilter);
}
@Override
protected void onPause() {
super.onPause();
unregisterReceiver(pathUpdateReceiver);
}
/**
* PathUpdate
*
*
*/
private class PathUpdateReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
if (map != null
&& intent.getAction().equalsIgnoreCase(
AppConstants.VEHICLE_DATA_SAMPLE_ID)) {
map.getUiSettings().setZoomControlsEnabled(true);
map.getUiSettings().setTiltGesturesEnabled(true);
map.getUiSettings().setAllGesturesEnabled(true);
VehicleDataSample vehicleDataSample = ((GoldenHourTrackerApp) getApplication()).getVehicleDataSample();
destinationLocation[0] = vehicleDataSample.getLatitude();
destinationLocation[1] = vehicleDataSample.getLongitude();
Log.e(TAG, "received location update:"+destinationLocation[0]+", "+destinationLocation[1]);
LatLng newPoint = new LatLng(destinationLocation[0],
destinationLocation[1]);
if (null != destinationLocation) {
map.setTrafficEnabled(false);
map.setBuildingsEnabled(true);
map.setMapType(GoogleMap.MAP_TYPE_NORMAL);
LatLng originlatlng = new LatLng(destinationLocation[0],
destinationLocation[1]);
map.moveCamera(CameraUpdateFactory.newLatLngZoom(
originlatlng, ZOOM_LEVEL));
-@SuppressWarnings("unused")
MarkerOptions traumaLoacationMarkerOption = new MarkerOptions()
.position(originlatlng)
.title(TRAUMA_LOCATION_MARKER_NAME)
.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_RED));
if (ambulanceMarkerOption == null) {
ambulanceMarkerOption = new MarkerOptions()
.position(originlatlng)
.title(AMBULANCE_MARKER_NAME)
.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_GREEN));
// TODO: Currently Not adding
// TRAUMA_LOCATION_MARKER_NAME on Map
// map.addMarker(traumaLoacationMarkerOption);
marker = map.addMarker(ambulanceMarkerOption);
marker.showInfoWindow();
}
if (null == lineOptions) {
lineOptions = new PolylineOptions();
lineOptions.add(newPoint);
// A 5 width Polyline
lineOptions.width(POLYLINE_WIDTH);
lineOptions.color(context.getResources().getColor(
R.color.blue));
polyline = map.addPolyline(lineOptions);
}
marker.setPosition(newPoint);
marker.setVisible(true);
marker.showInfoWindow();
map.animateCamera(CameraUpdateFactory.newLatLngZoom(
newPoint, ZOOM_LEVEL));
points = polyline.getPoints();
points.add(newPoint);
polyline.setPoints(points);
}
}
}
}
}