This example from the Mapbox documentation shows how to restrict map panning. You can create a LatLngBounds object from the northwest and southeast corners of the region where you'd like to restrict map panning to. In this case, the region will be the entire world, and the boundaries will specify where you want the "left" and "right" vertical cutoffs to be.
The coordinates below worked well for me, but you could further adjust them to get the exact effect that you are looking for. geojson.io is a great resource for visualizing GeoJSON features on a map, if you'd like to experiment with adjusting this bounding box.
/* Define bounding box. */
private static final LatLng BOUND_CORNER_NW = new LatLng(82.85338229176081, -141.328125);
private static final LatLng BOUND_CORNER_SE = new LatLng( -62.59334083012023, 167.34375);
private static final LatLngBounds RESTRICTED_BOUNDS_AREA = new LatLngBounds.Builder()
.include(BOUND_CORNER_NW)
.include(BOUND_CORNER_SE)
.build();
Note that Mapbox GL JS has setRenderWorldCopies and getRenderWorldCopies methods, which, as demonstrated in this render world copies example, allows you to toggle between rendering a single world and multiple copies of the world. The Maps SDK for Android does not include the same feature, however.
