Draw MyMarkerView at postion of values in barchart negative

[HaiPham94]

I try to draw markerview at to values position in bartchart negative. But it wrong postion.
In MyMarkerView extends MarkerView, I try to override fun :
@OverRide
public MPPointF getOffset() {
if (offY >= 0) { //value of Entry.getY
return new MPPointF(-(getWidth() / 2), -getHeight());
} else {
return new MPPointF(-(getWidth() / 2), getHeight());
}
}

But it not working! Please help me!