display.setStatusBar( display.HiddenStatusBar )
 
-- Load external Lua libraries (from project directory)
local ui = require( "ui" )
 
local locationNumber = 1 -- a counter to display on location labels
local currentLocation, currentLatitude, currentLongitude
 
local background = display.newImage( "bkg_grass.png", true )
background.x = display.contentWidth / 2
background.y = display.contentHeight / 2
 
shadow = display.newRect( 7, 7, 306, 226 )
shadow:setFillColor( 0, 0, 0, 120 )
 
local label = display.newText( "Maps not supported in Corona Simulator.", 20, 70, native.systemFont, 14 )
label:setTextColor( 255, 255, 255 )
 
local label2 = display.newText( "(Build for XCode Simulator or iOS device.)", 20, 95, native.systemFont, 14 )
label2:setTextColor( 255, 255, 255  )
 
 
-- Create a native MapView (requires XCode Simulator build or device build)
-- You can create multiple maps, if you like...
myMap = native.newMapView( 20, 20, 300, 220 )
myMap.mapType = "normal" -- other mapType options are "satellite" or "hybrid"
 
-- The MapView is just another Corona display object, and can be moved or rotated, etc.
myMap.x = display.contentWidth / 2
myMap.y = 120
 
-- Initialize map to a real location, since default location (0,0) is not very interesting
myMap:setCenter( 37.331692, -122.030456 )
 
 
-- A handler for the native keyboard
local fieldHandler = function( event )
        -- Hide keyboard when the user clicks "Return" in this field
        if ( "submitted" == event.phase ) then
                native.setKeyboardFocus( nil )
        end
end
 
-- A native text input field (requires XCode Simulator build or device build)
inputField = native.newTextField( 10, 252, 300, 28, fieldHandler )
inputField.font = native.newFont( native.systemFont, 16 )
inputField.text = "Broadway and Columbus, San Francisco" -- example of searchable location
inputField:setTextColor( 45, 45, 45 )
 
 
-- A function to handle the "mapAddress" event (also known as "reverse geocoding")
local mapAddressHandler = function( event )
        locationText =
                "Latitude: " .. currentLatitude .. 
                ", Longitude: " .. currentLongitude ..
                ", Address: " .. event.streetDetail .. " " .. event.street ..
                ", " .. event.city ..
                ", " .. event.region ..
                ", " .. event.country ..
                ", " .. event.postalCode
                
        local alert = native.showAlert( "You Are Here", locationText, { "OK" } )
end
 
-- Create buttons and their functions:
 
local button1Release = function( event )
        -- This calls a Google web API to find the location of the submitted string
        -- Valid strings include addresses, intersections, and landmarks like "Golden Gate Bridge", "Eiffel Tower" or "Buckingham Palace"
        latitude, longitude = myMap:getAddressLocation( inputField.text )
 
        -- Move map so this location is at the center
        -- (The final parameter toggles map animation, which may not be visible if moving a large distance)
        myMap:setCenter( latitude, longitude, true )
        
        markerTitle = "Location " .. locationNumber
        locationNumber = locationNumber + 1
 
        -- Add a pin to the map at the new location
        myMap:addMarker( latitude, longitude, { title=markerTitle, subtitle=inputField.text } )
end
 
local button2Release = function( event )
        -- Fetch the user's current location
        -- Note: in XCode Simulator, the current location defaults to Apple headquarters in Cupertino, CA
        currentLocation = myMap:getUserLocation()
        currentLatitude = currentLocation.latitude
        currentLongitude = currentLocation.longitude
        
        -- Move map so that current location is at the center
        myMap:setCenter( currentLatitude, currentLongitude, true )
        
        -- Look up nearest address to this location (this is returned as a "mapAddress" event, handled above)
        myMap:nearestAddress( currentLatitude, currentLongitude )
end
 
local button3Release = function( event )
        myMap:removeAllMarkers()
        locationNumber = 1 -- reset counter for popup labels
end
 
 
local button1 = ui.newButton{
        default = "buttonGreen.png",
        over = "buttonGreenOver.png",
        onRelease = button1Release,
        text = "Find Location",
        emboss = true
}
 
local button2 = ui.newButton{
        default = "buttonOrange.png",
        over = "buttonOrangeOver.png",
        onRelease = button2Release,
        text = "Current Location",
        emboss = true
}
 
local button3 = ui.newButton{
        default = "buttonRed.png",
        over = "buttonRedOver.png",
        onRelease = button3Release,
        text = "Remove All Markers",
        emboss = true
}
 
button1.x = display.contentWidth / 2; button1.y = 320
button2.x = display.contentWidth / 2; button2.y = 380
button3.x = display.contentWidth / 2; button3.y = 440
 
-- A listener for the address lookup result
-- (This could also be a table listener on the map itself, in case you have more than one simultaneous map.)
Runtime:addEventListener( "mapAddress", mapAddressHandler )