public int getEdgeSize() {
        return mEdgeSize;
    }
Return the size of an edge. This is the range in pixels along the edges of this view
that will actively detect edge touches or drags if edge tracking is enabled.

@return The size of an edge in pixels
@see #setEdgeTrackingEnabled(int)
app/src/main/java/home/smart/fly/animations/widget/slidepanel/ViewDragHelper.java