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Draggable Marker
{{ activity_source_note("DraggableMarkerActivity.kt") }}
Adding a marker on tap
--8<-- "MapLibreAndroidTestApp/src/main/java/org/maplibre/android/testapp/activity/style/DraggableMarkerActivity.kt:addOnMapClickListener"
Allowing markers to be dragged
This is slightly more involved, as we implement it by implementing a DraggableSymbolsManager helper class.
This class is initialized and we pass a few callbacks when when markers are start or end being dragged.
--8<-- "MapLibreAndroidTestApp/src/main/java/org/maplibre/android/testapp/activity/style/DraggableMarkerActivity.kt:draggableSymbolsManager"
The implementation of DraggableSymbolsManager follows. In its initializer we define a handler for when a user long taps on a marker. This then starts dragging that marker. It does this by temporarily suspending all other gestures.
We create a custom implementation of MoveGestureDetector.OnMoveGestureListener and pass this to an instance of AndroidGesturesManager linked to the map view.
!!! tip See maplibre-gestures-android for the implementation details of the gestures library used by MapLibre Android.
--8<-- "MapLibreAndroidTestApp/src/main/java/org/maplibre/android/testapp/activity/style/DraggableMarkerActivity.kt:DraggableSymbolsManager"