LatLngBounds.Builder builder = new LatLngBounds.Builder();
builder.include(northeast);
builder.include(southwest);
final LatLngBounds bounds = builder.build();

map.setOnMapLoadedCallback(new GoogleMap.OnMapLoadedCallback() {
    @Override
    public void onMapLoaded() {
        map.moveCamera(CameraUpdateFactory.newLatLngBounds(bounds, 5));
    }
});