I have a project on Google map based application. it is similar to Maps application provided by Google. i selected this project because Google do not provide enough information, route and other facilities that are available for other countries.
So my project objective is
current location
shortest path with path highlighted
showing places
information about places.
These are the main objective and I have obtained map and current location. So I need help on other objective.
And as I learned many thing by searching and from other source. shortest path is mathematical. polyline is available in Google map for highlight and I referred
How to draw road directions between two geocodes in android google map v2?
but was not helpful for me. I am using sq-lite for database.
You may think this is as not specific question and this is my first question and trying to fit in stackoverflow pattern.
Related
Alongside with my friends I am about to develop an android application. The application will use maps a lot, finding routes, placing markers, drawing predefined routes, stuff like that.
There is this Google Maps APIv2. So I tried it, write some code and looks good. I am able to place markers and draw polylines, however my application will have some predefined routes. One route is set of LatLng points. So I just add these points to PolylineOptions and add it to map. Great, it works.
But these predefined routes will be created in web-based application also using Google Maps APIv2 or similar api/library. Some streets are not straight they are curved so you need to create a lot of LatLng points to get it look nice which is very important. I can do this but I want to put only two LatLng points - at the beginning of the street and at the end.
Here is the image:
On the left, route has only two LatLng points (red dots) and that is desired shape of line. On the right same route with 2 LatLng points gives me route coloured in light blue, and this is what actually happens if I just add polyline to GoogleMap object. In order to create same effect as in left image, I need to create many LatLng (red dots) points which is not appropriate for those who will create these routes. So this leads us to routing problem which can be solved by using Google Directions API. Which solves the problem of drawing routes with less markers. Basically what I understood, this API for directions actually creates a lot of these LatLng points that I draw using for-each loop as seen on right part of picture above. And I need to contact Google Web Service for this so I need to have Internet connection - and this is the problem.
Sometimes internet will not be available hence I need some alternative solution. I've heard of Open Street Maps, but I am not sure how to use it and does it needs internet connection for creating these routes.
Is there any free library that offers offline routing and showing maps offline? Basically all map interactions must be done without use of internet.
But it is understandable if internet connection is needed only for the first run of application as it is needed for Google Maps APIv2, well application crashes until I turn on internet, after which any next run I do not need internet..
A web based application will be made for creating these routes and routes will be created by users for whom we develop this application. And as users can be very annoying they will demand some user-friendly and easy interface for creating routes. Telling them that they need to create 100 to 500 points for each route, and if there is 60-70 routes they will gladly say NO to our application.
Any advice? If it is possible, I can write my own routing algorithm for Google Maps to work offline, I am very skilful at "Algorithms and Data Structures" - any guides/tutorials for this? But I guess this map is just set of tiles, and does not have necessary information for finding route.... So please correct If I am mistaken for anything.
You can use the Scout SDK (provides a free usage quota) as it offers full offline maps, routing & navigation.
Have a look into the open source projects GraphHopper, Mapsforge and OpenScience-VTM which can do routing and/or maps offline. And all use OpenStreetMap data. Other projects exists of course, have a look here and here.
Also have a look into the GraphHopper map matching component which could be interesting for your specific use case and can work offline too.
(Note I'm the author of GraphHopper)
If it is possible, I can write my own routing algorithm for Google Maps to work offline
No you can't, the data is not open nor you can buy the data to my knowledge.
Another option is OsmAnd. The OSM wiki also has some information about OsmAnd and even more information about OSM on Android in general as well as pages about rendering and routing.
I am developing an app for local bus system and as per requirement, a bus can have multiple routes from one location to other. So i have to implement methodology like
fetch user's current location
get destination from user and accordingly show user all possible routes to destination
show all paths on map simulataneously with optimal shortest path highlighted with different color.
currently, I have progressed to basic application having functionality
get user's current location and pin point it with marker on google map
getting single path to destination (using google maps api)
plotting it on map by polyline. I have used one tutorial that implements navigation from source to destination.
Now I have to find all possible routes from source to destination. searched for answer but most answers referred to apply single path which I have already done. Any help will be much more appreciated.. Thanks in advance...
Use Google Directions API with parameter 'alternatives=true'.
I already searched on StackOverflow and Google. But i didn't find a real answer. I think there is just no DirectionsRenderer in the Android API. But can you acknowledge this?
If there is not DirectionsRenderer, how could i use the Android API to show a GoogleMaps and draw a Route on the Map?
I want to draw a nice route. Not just lines between the coordinates of each route-section which are also delivered from the Directions-Request.
I think there is just no DirectionsRenderer in the Android API. But can you acknowledge this?
There is no DirectionsRenderer in Maps V2. You can tell this by reading the documentation.
how could i use the Android API to show a GoogleMaps and draw a Route on the Map?
There is nothing in Maps V2 to support this.
I want to draw a nice route. Not just lines between the coordinates of each route-section which are also delivered from the Directions-Request.
You will need to find some Web service that will serve up coordinate information for the route with sufficient granularity (e.g., every 10m) to give you your "nice route", then use a Polyline or something like that for actually rendering the route.
SO i found out that it is possible to just take the legs, then the steps and within the steps you will find the "points".. when you decode the points string its a very detailed list of all coordinates.
with this coordinates, you can easily draw a nice route on the map.
so it's possible without the need of a additional Web-API.
Can i get direction between 2 points with using Google Maps v2 in my Android application ?
I found Polyline but i don't want to draw a line between 2 points.
I found a solution which is using Intent. It can solve this problem but it is not useful because this solution is starting another map application and I want to show direction in my application. Can i do this ?
You cannot get directions using just the Google Maps V2 api. You should use the Google Directions API direction request call. This will return the raw direction data in json which would allow you to draw a Polyline for the directions on the map or show the data in any format you would like.
There isn't any method to do it because it envolves several computing that must be done in Google Maps servers (and they don't allow you to do so many without paying if you hold a business).
So, the only way is making a petition to google maps servers as they describe in the Google Maps Api documentation that #Bobbake4 linked. Then, you'll receive several coordinates that you'll use to draw a polyline which represents your route.
Hopefully, someone has already coded everything and shared gently with us here https://stackoverflow.com/a/15643705/1516973
That's absolutely the best answer covering Android Google Maps routing that I've found in Stack Overflow, so thanks to #Akexorcist and #emil-adz for it.
I built my application using Google Maps and it is using:
-BalloonItemizedOverlay
-BalloonOverlayView
-ItemizedOverlay
and what it does:
-Displays multiple points on map, each one clickable and balloon appears with relative text + description.
-Displays and updates the marker/point of user's position.
The only reason I want to switch to Open Street Map is because I would like to use the feature "caching map tiles" (presaving maps) which as far as I have looked it up is not allowed with Google Maps.
Can someone help me convert my application thoroughly to use OSMdroid instead of GoogleMaps? Providing me with some guides (very few support for OSMdroid at the moment...)
I have already looked up a lot of codes but they mostly differ in comparison with Google Maps and I can't seem to get it all right. I have managed to display user's location on the map but adding BalloonItemizedOverlays and so on is a hassle.
Anyway just help me out in any way you can - proposals on how to do it, sites with guides, anything :)
Thanks
http://code.google.com/p/osmbonuspack/wiki/Tutorial_1
http://code.google.com/p/osmbonuspack/wiki/Tutorial_2
I think these two tutorials should get you started with Balloons and Customized Balloons
Itemized overlay with osmdroid is quite easy to use, you should give it a try and you will get the feel of it once you try it our.