In the following sample, the map does not respond to pinch gestures. This can be reproduced on different versions of Android and different vendors of Hardware

import QtQuick 2.5
import QtQuick.Controls 1.4
import QtLocation 5.5
import QtPositioning 5.5

ApplicationWindow {
visible: true
Plugin

Map {
id: map
plugin: myPlugin
anchors.fill: parent
gesture.activeGestures: MapGestureArea.ZoomGesture | MapGestureArea.PanGesture | MapGestureArea.FlickGesture
gesture.enabled: true
zoomLevel: 16
Component.onCompleted:

}
}