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Overlapped Maps

In this guide you will learn how to render two interactive maps, such that the first one fills the viewport, and the second one is a smaller inset.
The maps are fully 3D, supporting pan, pinch-zoom, rotate and tilt, and each shows a different location.


First, get an API key token, see the Getting Started guide.
Download the Maps & Navigation SDK for Android archive file

Download the OverlappedMaps 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

Overlapped maps example Android screenshot

Overlapped maps example Android screenshot

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

Android example screenshot

You can open the MainActivity.kt file to see how an interactive map inset is rendered over another interactive map.

 1class MainActivity : AppCompatActivity() {
 2 private lateinit var gemSurfaceView: GemSurfaceView
 3 private var secondMapView: MapView? = null
 5 override fun onCreate(savedInstanceState: Bundle?) {
 6     super.onCreate(savedInstanceState)
 7     setContentView(R.layout.activity_main)
 9     ////////////////////////////////////////////
10     // This code block adds the small inset map:
11     gemSurfaceView = findViewById(
12     gemSurfaceView.onDefaultMapViewCreated = {
13         gemSurfaceView.gemScreen?.let { screen ->
14             val secondViewRect = RectF(0.0f, 0.0f, 0.5f, 0.5f)
15             secondMapView = MapView.produce(screen, secondViewRect, null, true)
16         }
17     }
18     ////////////////////////////////////////////
20     SdkSettings.onApiTokenRejected = {
21         Toast.makeText(this@MainActivity,
22              "TOKEN REJECTED", Toast.LENGTH_SHORT).show()
23     }
24     if (!Util.isInternetConnected(this)) {
25         Toast.makeText(this, "You must be connected to internet!",
26              Toast.LENGTH_LONG).show()
27     }
28 }
29 override fun onDestroy() {
30     super.onDestroy()
32     // Deinitialize the SDK.
33     GemSdk.release()
34 }
35 override fun onBackPressed() {
36     finish()
37     exitProcess(0)
38 }
MainActivity overrides the onCreate function, which checks that internet access is available, and calls the findViewById() function to find the surface on which the default map is rendered.
After the default map is created, the inset map is created as shown in the above code block gemSurfaceView.onDefaultMapViewCreated = { ... }

Android Examples

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