What I need to do is pretty simple, but I do not know how.
It works like this: I pass an address to the user and as soon as he is in the place he presses a button, when doing this the application should know if it is in the (or very close) location, if it is, execute a command, if otherwise it informs the user that it is far from the place. How can I do this?
I'm using Android Studio.
You can use Google's own lib for this. Google Maps Android API Utility Library
Add in your Gradle:
dependencies {
compile 'com.google.maps.android:android-maps-utils:x.y.z'
}
example:
LatLng posicaoInicial = new LatLng(latitude,longitude);
LatLng posicaiFinal = new LatLng(latitude,longitude);
double distance = SphericalUtil.computeDistanceBetween(posicaoInicial, posicaiFinal);
Log.i("LOG","A Distancia é = "+formatNumber(distance));
private String formatNumber(double distance) {
String unit = "m";
if (distance 1000) {
distance /= 1000;
unit = "km";
}
return String.format("%4.3f%s", distance, unit);
}
'
If you want to know the distance of the route, you can use Google Maps Distance Matrix API .
This API returns, for example, the time and duration between points.
Example: Distance between SP - RJ
Using your coordinates.
https://maps.googleapis.com/maps/api/distancematrix/json?units=metric&origins=-23.562984,-46.654261&destinations=-22.951669,-43.210466&key=KEY_CODE
Return:
{
"destination_addresses" : [ "Christ the Redeemer Statue Rio, Rio de Janeiro - RJ, Brasil" ],
"origin_addresses" : [
"Alameda Rio Claro, 313 - Bela Vista, São Paulo - SP, 01332-010, Brasil"
],
"rows" : [
{
"elements" : [
{
"distance" : {
"text" : "449 km",
"value" : 449025
},
"duration" : {
"text" : "5 horas 45 minutos",
"value" : 20689
},
"status" : "OK"
}
]
}
],
"status" : "OK"
}
Result: 5h 45min - 449 km