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4 Google APIs In this thesis, it is necessary to implement Google Maps as a source of maps. The reason for this choice is obvious, as Google Maps is used worldwide and nowadays provides one of the best map interfaces and APIs in the world, especially for Android platform. Several APIs from Google are used for the purpose of this thesis. The most important is to implement Google Maps API to display map data on the screen. All of the other used APIs from Google return JSON objects, so I had to use JSON parser to work with it [Google, 2017a]. Before you use any API from Google you need to obtain a Google API key and add it to the app. In appendix A is described how to set up the Google Maps API, how to modify the application’s manifest file and how to obtain a Google API Key. 4.1 Google Maps API The Google Maps API is very well documented, and for the Android platform, it is the best I can interact with. It is free of use with query limitations, but for the purpose of this thesis it is sufficient, and I count on it when implementing algorithms. With this API I can add to the map for example markers, polygons, and overlays. 4.2 Google Maps Directions API This API provides the ability to find directions between locations. There is a very useful feature named Time in Traffic. It returns the time required to get to the destination with respect actual traffic conditions. Besides that, it returns important information about the path. Included are time, time in traffic, distance, individually legs along the path etc. There is the possibility to get requests with more waypoints along the path. It is limited to maximum 23 waypoints in each request. There is a usage limit for this API. There are 2,500 requests per day for free, and speed limitation is declared as 50 requests per second. After exceeding this limit the API returns an empty JSON object [Google, 2017b]. 4.3 Google Maps Distance Matrix API Google’s Distance Matrix service computes travel distance and journey duration between multiple origins and destinations using a given mode of travel. This service does not return 8PDF Image | Driving Range Estimation and Trajectory Planning
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