Getting Google Maps Intent to Return Location - android

So I am trying to build an app that would allows the user to select a particular place from a Google Maps intent, and when the user pick a place, the intent would finish and return the latitude and longitude data to the previous activity.
What is the best way to do this?
What I have done so far:
I used GPSTracker from here.
to get the current latitude and longitude, and then used these data to start a google map intent pointing to current location.

The website you posted in your question does not look like it contains the actual map. If you need assistance with adding a Google Map to your application I would start here.
Assuming you have that working and your code allows a user to place his or her point already, you can retrieve the coordinates of that point by using a built in function in the Marker class getPosition().
You can use the coordinates by accessing the public variables .latitude and .longitude as follows:
LatLng coord = myMarker.getPosition();
double latitude = coord.latitude;
double longitude = coord.longitude;

Related

get google maps data with retrofit 2

I try to get the distance between two points by showing them together with a polyline. One marker is permanently somewhere and the other the user chooses the place they want when clicking on the map. I tried with many codes obtained from the Internet but for me neither works or just gives me the marker of a place with the latutude and longitude. I want to use retrofit 2 to bring the information. Can anyone help me with that?
On clicking on map you are placing marker, So if you want to get location of that marker then simply you can got that marker position using that marker object like this.
Double latitude = marker.getPosition().latitude;
Double longitude = marker.getPosition.longitude;
and you have already one location so you can find distance between two locations using this.
locationFrom.distanceTo(locationDestination);
here locationFrom is your source location from where you want to find distance and locationDestination is your destination location to where you find distance.

How to grab an coordinates of an address a user has entered into google maps?

so in my app the user enters a place like "McDonalds in London" (or an address) and then after google maps finds the specific location, I want to grab those coordinates and use them in my app. Does anyone know how I can do that?!?!
How do I access the google app's coordinates, or if i use fragment activity, how do I enter a search box for them to enter an address and grab those coordinates? I'm not sure which way is easier.
please help!
Try this code:
List<Address> foundAddresses = null;
foundAddresses = new Geocoder(this).getFromLocationName("McDonalds in London", 1);
double latitude = foundAddresses.get(0).getLatitude();
double longitude = foundAddresses.get(0).getLongitude();
You could have passed in any number in the call to getFromLocationName() in the event that you expected more than one match for "McDonalds in London".

Figure out Latitude and Longitude

I am trying to develop an android application that can do task according to the lat/long. This is something like if I am in particular suburb (Lets say I am in Belconnen, ACT Australia, I would like to get the details of that place automatically) - if I move out the border of belconnen then I have to show some other details.
If you check this google maps link: http://goo.gl/4mItcF you would see the red border is only belconnen suburb.
My question is how do I give the borders in my App (meaning how do I tell my App that I am now in belconnen, ACT? Is it by getting lat/long along the borders store them in DB and check if I am inside required lat/long, if that is the case DB would have huge numbers only for Belconnen, ACT right?
Or is there an easier way to get the borders?
Let me know!
Thanks!
There is a way , it is called Reverse Geocoding. You can use it by two ways :
1. Using Geocoder class of Android -
Geocoder gcd = new Geocoder(context, Locale.getDefault());
List<Address> addresses = gcd.getFromLocation(lat, lng, 1);
if (addresses.size() > 0)
System.out.println(addresses.get(0).getLocality());
Here you use lat = -35.2374551 and lng = 149.0672515 for Belconnen, ACT Australia. Check out the function getFromLocation for more information.
2. Using Google REST Web Services :
https://maps.googleapis.com/maps/api/geocode/json?latlng=-35.2374551,149.0672515 (JSON)
https://maps.googleapis.com/maps/api/geocode/xml?latlng=-35.2374551,149.0672515 (XML)
pass comma separated latitude and longitude and u will get the most precise location for that in response. Find more information here Reverse Geocoding google API
As soon as you go out of Belconnen, ACT Australia, the address in response will no longer contain this and you can put some logic to get your desired behavior.
As far as i understand, you would like to create a Location Aware Application.
As per the Android documentation, Google Play services location APIs are preferred over the Android framework location APIs (android.location) as a way of adding location awareness to your app.
Step 1 - Knowing the current Location of the User
Google recommends to use FusionProvider API for this purpose. It is one of the location APIs in Google Play services where you can specify requirements at a high level, like high accuracy or low power. It also optimizes the device's use of battery power.
https://developer.android.com/reference/com/google/android/gms/location/FusedLocationProviderApi.html
Step 2 - Based on the latitude and Longitude information retrieved in the location object, you can use the below Google web service to get the postal code of the location.
http://maps.googleapis.com/maps/api/geocode/json?latlng=lattitude,longitude&sensor=true
Step 3 - How Frequent can we retrieve the location information
Turning on the listeners continuously will impact the device battery highly. So, to avoid this, we need to minimize the frequency of retrieving the location information.
I would recommend to measure the distance traveled by the user and based on that set the next location update trigger. Since you are concerned about boundary only, we can set a high value based on the device acceleration.
Refer the below links for more details on how to implement this effectively.
https://stackoverflow.com/a/11644809/623517
Hope this helps.
You can get full address from lat long and then search your city or location. This answer explain how to do it : How to get complete address from latitude and longitude?
If you want further flexibility you can use geofence : http://developer.android.com/training/location/geofencing.html
You can approximate the region with LatLngBounds (com.google.android.gms.maps.model.LatLngBounds).
Use it like this:
LatLngBounds.Builder builder = new Builder();
for (int i=0; i<points.length; i++) {
builder.include(points[i]);
}
LatLngBounds bounds = builder.build();
And then check if your location falls inside it:
if (bounds.contains(myLatLng)) {
//your implementation
}
I know this approach cannot give perfect results but it seems to be more efficient then using the geofences.
LocationManager lm;
lm=(LocationManager)this.getSystemService(Context.LOCATION_SERVICE);
Criteria c=new Criteria();
String provider=lm.getBestProvider(c, false);
Location l=lm.getLastKnownLocation(provider);
double latitude = l.getLatitude(); // latitude
double longitude = l.getLongitude(); // longitude

how to share google map with current location in android?

I am trying to share google map with my current location in my app(similar to whatsapp), I searched for it but didn't find any solution. Can anybody guide me that how can I start working over it. I don't have any idea that how should I start this.
We need to know how you plan to share this data, but in general you can share your GeoPoint variable that contains your latitude and longitude position on the globe..
GeoPoint(int latitudeE6, int longitudeE6)
// Constructs a GeoPoint with the given latitude and longitude, measured in microdegrees (degrees * 1E6).

How to calculate the distance between the two given latitude and longitude while Location onchanged method is called

I have some queries regarding the using the google route map , currently iam working in Android , and the application iam developing uses
google map , actually the apps i for Car hiring , suppose the client send the pickup add and destination add , now the dirver will get the request that ther
is a pickup request , now supose currently driver is in some other location (A), and his pickup request is from location (B),, no i have to calculate the distance between driver location (A) and the pickup location (B) , I tried using the method given in Android Location ,but iam not getting the correct
distance
I have use the method
float[] result=new float[5];
myLocation.distanceBetween(ServerData.LATITUDE,ServerData.LONGITUDE, latitude,longitude,result);
String distance=Float.toString(result[0]);
here
ServerData.LATITUDE----> when the driver login sends it current location
ServerData.LONGITUDE
latitude--- > is the location moving towards the pickup point
longitude
can any one suggest how to do I am stuck with it
As that function takes a double you should better use double maybe adding a line somewhere you get your coordinates from
lat = Double.parseDouble(coordinates[0]);
long = Double.parseDouble(coordinates[0]);
And as above mentioned check for result[1] as well.

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