我正在尝试在 google map v2 上绘制自由格式线,所以我试图通过听标记拖动来做到这一点。我写了下面的代码,但它没有画任何东西
@Override
public void onMarkerDrag(Marker marker) {
Integer markerId = markerMapHash.get(marker);
// as I'm giving every marker a key by HashMap
if (markerId == 1) {
System.out.println("this is the draw line marker: "+marker.getPosition());
lineCordinates.add(marker.getPosition());
// lineCordinates is an arrayList
}
for (int i = 0; i < lineCordinates.size(); i++) {
myMap.addPolygon(new PolygonOptions()
.add(lineCordinates.get(i))
.strokeColor(Color.RED));
}
}
有人可以在这个问题上帮助我吗?提前致谢