lapractice.blogg.se - What is android studio google maps

(For more information on the OnPositionChangedListener, see Positioning section.) If the road element at position contains the tunnel attribute, it implies that the current location is provided by tunnel extrapolation. However, if your application also listens to the onPositionFixChanged() callback from PositioningManager.OnPositionChangedListener, then it receives this callback signifying a position fix change. If your application listens to position updates from NavigationManager.PositionListener, there are regular position updates during tunnel extrapolation.

It uses the last available position data which contains speed, orientation and GeoCoordinate to estimate the position of your vehicle inside a tunnel. Tunnel extrapolation is also performed internally by NavigationManager.

In simulation mode, the map-matched position is simulated along the route with a user-defined speed. Map Matching is automatically enabled in both navigation mode and tracking mode. Otherwise, navigation operations will not work properly. Instead, the application must first download the required map data through the use of MapLoader or MapDataPrefetcher.

Since a map is not displayed with this approach, map data will not be passively downloaded.

onResume() and onPause() methods are reference-counted and should be called an equal number of times. MapEngine.getInstance().onPause() puts the engine into a suspended state and release cached in memory data. (For example, you may want to retrieve speed warnings but do not want to draw a map.) This puts the engine in the "active state".

MapEngine.getInstance().onResume() should be called when the engine is required for headless navigation operations.

For navigation operation to work properly on application that does NOT use MapView or AndroidXMapFragment, the application needs to do the followings: