如何在Google地图中绘制源和目标之间的线？
我在地图中得到了正确的源和目的地纬度和经度，但我能够在源和目的地之间划线，但这条线是源和目标标记之间的地图中的海峡线显示。目的地Latitide和目标经度是从服务器成功获取的。
但我想画源和目的地之间的界线如下所示。
这是示例。
谷歌地图也显示源和目的地的CurrectPosition。
怎么可能？
请指导我。 请帮我。 谢谢。
我的代码是，
public class Map extends FragmentActivity {
GoogleMap googleMap;
SupportMapFragment fm;
double myLat = 23.0137759;
double destLat = 0.0;
double myLng = 72.5158836;
double destLng = 0.0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.navigate_to_me_map);
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
.permitAll().build();
StrictMode.setThreadPolicy(policy);
}
Intent intent = getIntent();
destLat = intent.getDoubleExtra("latitude", 0.0);
destLng = intent.getDoubleExtra("longitude", 0.0);
int status = GooglePlayServicesUtil
.isGooglePlayServicesAvailable(getBaseContext());
// Showing status
if (status != ConnectionResult.SUCCESS) { // Google Play Services
int requestCode = 10;
Dialog dialog = GooglePlayServicesUtil.getErrorDialog(status,
this, requestCode);
dialog.show();
} else {
SupportMapFragment supportMapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.fullmap);
googleMap = supportMapFragment.getMap();
googleMap.setMyLocationEnabled(true);
}
googleMap
.setOnMyLocationChangeListener(new OnMyLocationChangeListener() {
public void onMyLocationChange(Location location) {
// TODO Auto-generated method stub
myLat = location.getLatitude();
myLng = location.getLongitude();
}
});
drawRoutePath(strAddressOne);
}
}
private void drawRoutePath(String searchText) {
try {
// find current address latlong and true than draw route
// between to points or current loction and search
// address
googleMap.clear();
if (myLat != 0 && myLng != 0) {
LatLng origin = new LatLng(myLat, myLng);
drawMarker(origin);
LatLng dest = new LatLng(destLat, destLng);
drawMarker(dest);
Polyline line = googleMap.addPolyline(new PolylineOptions()
.add(origin, dest).width(5).color(Color.RED));
} else {
Toast.makeText(getApplicationContext(),
"Current Location does not found",
Toast.LENGTH_SHORT).show();
}
}
} catch (Exception e) {
// TODO: handle exception
Log.e("Second ", "drawRoutePath errro " + e.toString());
}
}
private void drawMarker(LatLng point) {
// Creating an instance of MarkerOptions
MarkerOptions markerOptions = new MarkerOptions();
// Setting latitude and longitude for the marker
markerOptions.position(point);
// Adding marker on the Google Map
googleMap.addMarker(new MarkerOptions().position(point).visible(true))
.showInfoWindow();
googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(
point.latitude, point.longitude), 6f));
}
}
2 个答案:
答案 0 :(得分：1)
这是在源和目的地之间绘制路线的源代码：
{
"name": "morningops",
"private": true,
"version": "0.0.1",
"description": "Morning Ops Automation",
"keywords": [],
"window": {
"icon": "app/images/icon.png",
"toolbar": true,
"frame": true,
"width": 800,
"height": 600,
"position": "center",
"resizable": true
},
"webkit": {
"plugin": false
},
"main": "app/index.html",
"dependencies": {
"react": "^0.13.3",
"require-text": "0.0.1"
},
"devDependencies": {
"browserify": "^11.1.0",
"chai": "^3.2.0",
"grunt": "^0.4.5",
"grunt-nw-builder": "^2.0.0",
"gulp": "^3.9.0",
"gulp-util": "^3.0.7",
"mocha": "^2.0.1",
"nw-builder": "^2.0.2",
"reactify": "^1.1.1",
"watchify": "^3.4.0"
},
"scripts": {
"start": "watchify app/scripts/app.js -o app/bundle.js -v",
"test": "mocha",
"app": "nw .",
"build": "./build/build",
"clean": "rm -rf build/cache app/bundle.js"
},
"browserify": {
"transform": [
[
"reactify",
{
"es6": true
}
]
]
}
}
DirectionsJSONParser.java如下：
public class MapActivity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener {
private SupportMapFragment mapFragment;
private GoogleMap map;
private GoogleApiClient mGoogleApiClient;
ArrayList markerPoints;
private LocationRequest mLocationRequest;
private long UPDATE_INTERVAL = 15000; /* 15 secs */
private long FASTEST_INTERVAL = 5000; /* 5 secs */
private final static int CONNECTION_FAILURE_RESOLUTION_REQUEST = 9000;
// Marker marker;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (!isGooglePlayServicesAvailable()) {
finish();
}
setContentView(R.layout.activity_map);
getSupportActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
getSupportActionBar().setDisplayShowCustomEnabled(true);
getSupportActionBar().setCustomView(R.layout.custom_actionbar_maps);
markerPoints = new ArrayList();
mapFragment = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map));
if (mapFragment != null) {
mapFragment.getMapAsync(new OnMapReadyCallback() {
@Override
public void onMapReady(GoogleMap map) {
loadMap(map);
}
});
} else {
Toast.makeText(this, "Error - Map Fragment was null!!", Toast.LENGTH_SHORT).show();
}
}
protected void loadMap(GoogleMap googleMap) {
map = googleMap;
if (map != null) {
// Map is ready
Toast.makeText(this, "Map Fragment was loaded properly!", Toast.LENGTH_SHORT).show();
map.setMyLocationEnabled(true);
map.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
@Override
public void onMapClick(LatLng point) {
// Already two locations
if(markerPoints.size()>1){
markerPoints.clear();
map.clear();
}
// Adding new item to the ArrayList
markerPoints.add(point);
// Creating MarkerOptions
MarkerOptions options = new MarkerOptions();
// Setting the position of the marker
options.position(point);
/**
* For the start location, the color of marker is GREEN and
* for the end location, the color of marker is RED.
*/
if(markerPoints.size()==1){
options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN));
}else if(markerPoints.size()==2){
options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
}
// Add new marker to the Google Map Android API V2
map.addMarker(options);
// Checks, whether start and end locations are captured
if(markerPoints.size() >= 2){
LatLng origin = (LatLng) markerPoints.get(0);
LatLng dest = (LatLng) markerPoints.get(1);
// Getting URL to the Google Directions API
String url = getDirectionsUrl(origin, dest);
DownloadTask downloadTask = new DownloadTask();
// Start downloading json data from Google Directions API
downloadTask.execute(url);
}
}
});
// Now that map has loaded, let's get our location!
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this).build();
connectClient();
} else {
Toast.makeText(this, "Error - Map was null!!", Toast.LENGTH_SHORT).show();
}
}
protected void connectClient() {
// Connect the client.
if (isGooglePlayServicesAvailable() && mGoogleApiClient != null) {
mGoogleApiClient.connect();
}
}
/*
* Called when the Activity becomes visible.
*/
@Override
protected void onStart() {
super.onStart();
connectClient();
}
/*
* Called when the Activity is no longer visible.
*/
@Override
protected void onStop() {
// Disconnecting the client invalidates it.
if (mGoogleApiClient != null) {
mGoogleApiClient.disconnect();
}
super.onStop();
}
/*
* Handle results returned to the FragmentActivity by Google Play services
*/
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// Decide what to do based on the original request code
switch (requestCode) {
case CONNECTION_FAILURE_RESOLUTION_REQUEST:
/*
* If the result code is Activity.RESULT_OK, try to connect again
*/
switch (resultCode) {
case Activity.RESULT_OK:
mGoogleApiClient.connect();
break;
}
}
}
// Fetches data from url passed
private boolean isGooglePlayServicesAvailable() {
// Check that Google Play services is available
int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
// If Google Play services is available
if (ConnectionResult.SUCCESS == resultCode) {
// In debug mode, log the status
Log.d("Location Updates", "Google Play services is available.");
return true;
} else {
// Get the error dialog from Google Play services
Dialog errorDialog = GooglePlayServicesUtil.getErrorDialog(resultCode, this,
CONNECTION_FAILURE_RESOLUTION_REQUEST);
// If Google Play services can provide an error dialog
if (errorDialog != null) {
// Create a new DialogFragment for the error dialog
ErrorDialogFragment errorFragment = new ErrorDialogFragment();
errorFragment.setDialog(errorDialog);
errorFragment.show(getSupportFragmentManager(), "Location Updates");
}
return false;
}
}
/*
* Called by Location Services when the request to connect the client
* finishes successfully. At this point, you can request the current
* location or start periodic updates
*/
@Override
public void onConnected(Bundle dataBundle) {
// Display the connection status
Location location = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if (location != null) {
Toast.makeText(this, "GPS location was found!", Toast.LENGTH_SHORT).show();
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(latLng, 16);
map.animateCamera(cameraUpdate);
//marker = map.addMarker(new MarkerOptions().position(latLng).icon(BitmapDescriptorFactory.fromResource(R.drawable.vehicle_marker)).flat(true).anchor(0.5f,0.5f));
startLocationUpdates();
} else {
Toast.makeText(this, "Current location was null, enable GPS on emulator!", Toast.LENGTH_SHORT).show();
}
}
protected void startLocationUpdates() {
mLocationRequest = new LocationRequest();
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
mLocationRequest.setInterval(UPDATE_INTERVAL);
mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient,
mLocationRequest, this);
}
public void onLocationChanged(Location location) {
// Report to the UI that the location was updated
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
/* if(marker == null){
*//* marker.remove();*//*
marker = map.addMarker(new MarkerOptions().position(latLng).icon(BitmapDescriptorFactory.fromResource(R.drawable.vehicle_marker)));
}
marker.setPosition(latLng);
*/
CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(latLng, 16);
map.animateCamera(cameraUpdate);
String msg = "Updated Location: " +
Double.toString(location.getLatitude()) + "," +
Double.toString(location.getLongitude());
Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
}
/*
* Called by Location Services if the connection to the location client
* drops because of an error.
*/
@Override
public void onConnectionSuspended(int i) {
if (i == CAUSE_SERVICE_DISCONNECTED) {
Toast.makeText(this, "Disconnected. Please re-connect.", Toast.LENGTH_SHORT).show();
} else if (i == CAUSE_NETWORK_LOST) {
Toast.makeText(this, "Network lost. Please re-connect.", Toast.LENGTH_SHORT).show();
}
}
/*
* Called by Location Services if the attempt to Location Services fails.
*/
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
/*
* Google Play services can resolve some errors it detects. If the error
* has a resolution, try sending an Intent to start a Google Play
* services activity that can resolve error.
*/
if (connectionResult.hasResolution()) {
try {
// Start an Activity that tries to resolve the error
connectionResult.startResolutionForResult(this,
CONNECTION_FAILURE_RESOLUTION_REQUEST);
/*
* Thrown if Google Play services canceled the original
* PendingIntent
*/
} catch (IntentSender.SendIntentException e) {
// Log the error
e.printStackTrace();
}
} else {
Toast.makeText(getApplicationContext(),
"Sorry. Location services not available to you", Toast.LENGTH_LONG).show();
}
}
// Define a DialogFragment that displays the error dialog
public static class ErrorDialogFragment extends DialogFragment {
// Global field to contain the error dialog
private Dialog mDialog;
// Default constructor. Sets the dialog field to null
public ErrorDialogFragment() {
super();
mDialog = null;
}
// Set the dialog to display
public void setDialog(Dialog dialog) {
mDialog = dialog;
}
// Return a Dialog to the DialogFragment.
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
return mDialog;
}
}
// Fetches data from url passed
private class DownloadTask extends AsyncTask<String, Void, String>{
// Downloading data in non-ui thread
@Override
protected String doInBackground(String... url) {
// For storing data from web service
String data = "";
try{
// Fetching the data from web service
data = downloadUrl(url[0]);
}catch(Exception e){
Log.d("Background Task",e.toString());
}
return data;
}
// Executes in UI thread, after the execution of
// doInBackground()
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
ParserTask parserTask = new ParserTask();
// Invokes the thread for parsing the JSON data
parserTask.execute(result);
}
}
/** A class to parse the Google Places in JSON format */
private class ParserTask extends AsyncTask<String, Integer, List<List<HashMap<String,String>>> >{
// Parsing the data in non-ui thread
@Override
protected List<List<HashMap<String, String>>> doInBackground(String... jsonData) {
JSONObject jObject;
List<List<HashMap<String, String>>> routes = null;
try{
jObject = new JSONObject(jsonData[0]);
DirectionsJSONParser parser = new DirectionsJSONParser();
// Starts parsing data
routes = parser.parse(jObject);
}catch(Exception e){
e.printStackTrace();
}
return routes;
}
// Executes in UI thread, after the parsing process
@Override
protected void onPostExecute(List<List<HashMap<String, String>>> result) {
ArrayList points = null;
PolylineOptions lineOptions = null;
MarkerOptions markerOptions = new MarkerOptions();
// Traversing through all the routes
for(int i=0;i<result.size();i++){
points = new ArrayList();
lineOptions = new PolylineOptions();
// Fetching i-th route
List<HashMap<String, String>> path = result.get(i);
// Fetching all the points in i-th route
for(int j=0;j <path.size();j++){
HashMap<String,String> point = path.get(j);
double lat = Double.parseDouble(point.get("lat"));
double lng = Double.parseDouble(point.get("lng"));
LatLng position = new LatLng(lat, lng);
points.add(position);
}
// Adding all the points in the route to LineOptions
lineOptions.addAll(points);
lineOptions.width(12);
lineOptions.color(Color.RED);
lineOptions.geodesic(true);
}
// Drawing polyline in the Google Map for the i-th route
map.addPolyline(lineOptions);
}
}
private String getDirectionsUrl(LatLng origin,LatLng dest){
// Origin of route
String str_origin = "origin="+origin.latitude+","+origin.longitude;
// Destination of route
String str_dest = "destination="+dest.latitude+","+dest.longitude;
// Sensor enabled
String sensor = "sensor=false";
// Building the parameters to the web service
String parameters = str_origin+"&"+str_dest+"&"+sensor;
// Output format
String output = "json";
// Building the url to the web service
String url = "https://maps.googleapis.com/maps/api/directions/"+output+"?"+parameters;
return url;
}
/** A method to download json data from url */
private String downloadUrl(String strUrl) throws IOException {
String data = "";
InputStream iStream = null;
HttpURLConnection urlConnection = null;
try{
URL url = new URL(strUrl);
// Creating an http connection to communicate with url
urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while( ( line = br.readLine()) != null){
sb.append(line);
}
data = sb.toString();
br.close();
}catch(Exception e){
Log.d("Exception while downloading url", e.toString());
}finally{
iStream.close();
urlConnection.disconnect();
}
return data;
}
}
答案 1 :(得分：0)
您可以使用以下库：
相关问题
最新问题
- 我写了这段代码，但我无法理解我的错误
- 我无法从一个代码实例的列表中删除 None 值，但我可以在另一个实例中。为什么它适用于一个细分市场而不适用于另一个细分市场？
- 是否有可能使 loadstring 不可能等于打印？卢阿
- java中的random.expovariate()
- Appscript 通过会议在 Google 日历中发送电子邮件和创建活动
- 为什么我的 Onclick 箭头功能在 React 中不起作用？
- 在此代码中是否有使用“this”的替代方法？
- 在 SQL Server 和 PostgreSQL 上查询，我如何从第一个表获得第二个表的可视化
- 每千个数字得到
- 更新了城市边界 KML 文件的来源？