Hello Map¶
In this guide you will learn how to render
an interactive map centered on a desired location.
The map is fully 3D, supporting pan, pinch-zoom,
rotate and tilt.
Setup¶
First, get an API key token, see the
Getting Started guide.
Download the HelloMap 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 interactive map is rendered.
1class MainActivity : AppCompatActivity()
2{
3 private var mainMapView: MapView? = null
4 override fun onCreate(savedInstanceState: Bundle?)
5 {
6 super.onCreate(savedInstanceState)
7 setContentView(R.layout.activity_main)
8 val mapSurface = findViewById<GemSurfaceView>(R.id.gem_surface)
9 mapSurface.onScreenCreated = { screen ->
10 // Defines an action that should be done after the screen is created.
11 SdkCall.execute
12 {
13 /*
14 Define a rectangle in which the map view will expand.
15 Predefined value of the offsets is 0.
16 Value 1 means the offset will take 100% of available space.
17 */
18 val mainViewRect = RectF(0.0f, 0.0f, 1.0f, 1.0f)
19 // Produce a map view and establish that it is the main map view.
20 val mapView = MapView.produce(screen, mainViewRect)
21 mainMapView = mapView
22 }
23 }
24 val app = packageManager.getApplicationInfo(packageName, PackageManager.GET_META_DATA)
25 val token = app.metaData.getString("com.generalmagic.sdk.token") ?: "YOUR_TOKEN"
26 if (!SdkInitHelper.init(this, token))
27 {
28 // The SDK initialization was not completed.
29 finish()
30 }
31 }
32 override fun onDestroy()
33 {
34 super.onDestroy()
35 // Deinitialize the SDK.
36 SdkInitHelper.deinit()
37 }
38 override fun onBackPressed()
39 {
40 terminateApp(this)
41 }
42}
The
MainActivity overrides the onCreate function which defines themapSurface.onScreenCreated callback to create a MapView instance
when a drawing surface is available:val mapView = MapView.produce(screen, mainViewRect)Then the SDK is initialized:
SdkInitHelper.init(this, token)
and the map is rendered.