// calculates initial course between two airports given through airport ID's
// values from database class methods must be in radians as this is what is used here
public static double calcCourBwAir(String id1, String id2) {
double cord1[] = FPCDatabase.accsAir(id1);
double cord2[] = FPCDatabase.accsAir(id2);
double lat1 = cord1[0];
double lat2 = cord2[0];
double longD = cord2[1] - cord1[1]; // longD is the difference of longitude 2 - longitude 1
double y = Math.sin(longD) * Math.cos(lat2);
double x = Math.cos(lat1) * Math.sin(lat2) - Math.sin(lat1) * Math.cos(lat2) * Math.cos(longD);
return Math.atan2(y, x);
}
// calculates flying distance between the two airports that are given through ID's
// values from database class methods must be in radians as this is what is used here
public static double calcFlyDis(String id1, String id2) {
double r = 6371; // this is KM which means the distance is returned in KM
double cord1[] = FPCDatabase.accsAir(id1);
double cord2[] = FPCDatabase.accsAir(id2);
double lat1 = cord1[0];
double lat2 = cord2[0];
double latD = lat2 - lat1;
double longD = cord2[1] - cord1[1]; // longD is the difference of longitude 2 - longitude 1
double a =
Math.sin(latD / 2) * Math.sin(latD / 2)
+ Math.sin(longD / 2) * Math.sin(longD / 2) * Math.cos(lat1) * Math.cos(lat2);
return r * (2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a)));
}
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState); // call the superclass version
setContentView(R.layout.flyingdistancecoursepage); // set the layout
// get list of ids from database class
ArrayList<?> idArray =
FPCDatabase.getAirID(); // returning the array list from database class to then get values
ids = new String[idArray.size()];
for (int i = 0; i < idArray.size(); i++) {
ids[i] =
(String)
idArray.get(
i); // taking every id from the arraylist in the database and adding it to the
// string array ids
}
// Creating adapter with the string array ids and adding it to spinner
ArrayAdapter<String> adapterAirports =
new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, ids);
ArrayAdapter<CharSequence> adapterUnits =
ArrayAdapter.createFromResource(
this, R.array.distance_units, android.R.layout.simple_spinner_item);
airportOne = (Spinner) findViewById(R.id.flyingdistancecourseDepartingAirportSpinner);
airportTwo = (Spinner) findViewById(R.id.flyingdistanceDestinationAirportSpinner);
distanceUnits = (Spinner) findViewById(R.id.flyingdistancecourseDistanceUnitSpinner);
// Displays the string array for the spinners
airportOne.setAdapter(adapterAirports);
airportTwo.setAdapter(adapterAirports);
distanceUnits.setAdapter(adapterUnits);
airportOne.setOnItemSelectedListener(new airportOneSelectedListener());
airportTwo.setOnItemSelectedListener(new airportTwoSelectedListener());
distanceUnits.setOnItemSelectedListener(new distanceUnitSelectedListener());
}