OCTranspoLive: A live OCTranspo GPS bus location application for ...

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4.1.2 StopsNearActivityOne of the options the user can select from the main menu is to look for stops nearthem. This will create and Intent object and then start the StopsNearActivity usingstartActivity. When this Activity is created the location services are used to nd theuser's location. If available the GPS will be used for a ne-grained location and ifnot Google's location service will be used, provided the WiFi on the device is turnedon. When the user's coordinates are found a request is made to the OCTranspoLiveAPI. This is done using an HTTP GET request like the one below.Listing 2: Near Stops Requesthttp : / / l o c a l h o s t :8080/ octranspo_api / r e s t / stops / near ? l a t=45.4104& lon =−75.6935Figure 3: Finding bus stops near youIn Figure 3 the rst screenshot shows what the user will see while waiting for16
their location to be established and to get a response from the OCTranspoLive API.The response is a JSON array similar to this:Listing 3: Near Stops Response[ { " stop_lon ": −75.692749 ," d i s t a n c e ":0.0365410481320902 ,"stop_code ":"7666" ," stop_lat " : 4 5 . 4 1 0 3 5 8 , " stop_name " : "BANK /FLORA"} ,{" stop_lon ": −75.69265 ," d i s t a n c e":0.0477259843744609 ," stop_code ":"7667" ," stop_lat" : 4 5 . 4 1 0 7 4 8 , " stop_name " : "BANK / FLORA"} ,{" stop_lon": −75.693443 ," d i s t a n c e ":0.0815039906925018 ," stop_code":"2489" ," stop_lat " : 4 5 . 4 1 1 5 7 9 , " stop_name " : "BANK / MCLEOD"} ,{" stop_lon ": −75.691902 ," d i s t a n c e ":0.0918376667631642 ,"stop_code ":"2478" ," stop_lat " : 4 5 . 4 0 9 6 8 7 , " stop_name " : "CATHERINE / BANK" } ]The stops near the user are then shown on a MapViewActivity as seen in secondscreenshot in Figure 3. Clicking on one of the overlays will start a StopScheduleActivityfor the selected stop. The StopScheduleActivity asks the user to select one ofthe routes available at the stop and will then download live GPS estimates of arrivaltimes and display them on a dynamic timetable for the user. StopScheduleActivitywill be discussed in detail in the next section.4.1.3 StopScheduleActivityA user gets to the StopScheduleActivity by either rst nding stops near them andthen clicking on a overlay or by selecting the second item from the ListView inthe MainViewActivity.If the use scenario is like the rst, the user will be facedwith a dialog asking them to enter the 4 digit stop number of the stop they desire17
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