Location Wikipedia

In this guide you will learn how to render the wikipedia page for a point of interest (POI) on the map.

Setup

First, get an API key token, see the Getting Started guide.

Download the Maps & Navigation SDK for Android archive file

Download the LocationWikipedia project archive file or clone the project with Git

See the Configure Android Example guide.

Run the example

In Android Studio, from the File menu, select Sync Project with Gradle Files

An android device should be connected via USB cable.

Press SHIFT+F10 to compile, install and run the example on the android device.

How it works

You can open the MainActivity.kt file to see how the wikipedia page is obtained and displayed.

override fun onCreate(savedInstanceState: Bundle?) {
     super.onCreate(savedInstanceState)
     setContentView(R.layout.activity_main)
     locationName = findViewById(R.id.locationName)
     locationWiki = findViewById(R.id.locationWiki)
     progressBar = findViewById(R.id.progressBar)
     SdkSettings.onMapDataReady = onMapDataReady@{ isReady ->
         if (!isReady) return@onMapDataReady
         search()
     }
     SdkSettings.onApiTokenRejected = {
         // Check the TOKEN provided in the AndroidManifest.xml file.
         showToast("TOKEN REJECTED")
     }
     // This step of initialization is mandatory if you want
     // to use the SDK without a map.
     if (!GemSdk.initSdkWithDefaults(this)) {
         finish()
     }
     if (!Util.isInternetConnected(this)) {
         Toast.makeText(this, "You must be connected to internet!",
             Toast.LENGTH_LONG).show()
     }
 }

The MainActivity overrides the onCreate function, which checks that the API token is valid, initializes the maps SDK, and checks that internet access is available.

As soon as the map is ready, the search() function is called automatically.

private fun search() = SdkCall.execute {
    val name = "Eiffel Tower"
    val coordinates = Coordinates(0.0, 0.0)
    searchService.searchByFilter(name, coordinates)
}

The text string containing the name to search for is set in the search() function, and searchService.searchByFilter is called.

Coordinates are not necessary and can be set to 0.

private val searchService = SearchService(
    onStarted = {
         progressBar?.visibility = View.VISIBLE
    },

    onCompleted = { results, errorCode, _ ->
         progressBar?.visibility = View.GONE

         if (errorCode == GemError.NoError) {
             if (results.isNotEmpty()) {
                 val name = SdkCall.execute { results[0].name }
                 locationName?.text = name
                 requestWiki(results[0])
             } else {
                 // The search completed without errors,
                 // but there were no results found.
                 showToast("No results!")
             }
         }
     }
 )

When the search completes, the first result (at index 0) is passed to requestWiki(results[0]) to load the wikipedia page, unless the search found no results, in which case a message to that effect is displayed instead: showToast("No results!")

Android Examples

Maps SDK for Android Examples can be downloaded or cloned with Git