public void setEdgeTrackingEnabled(int edgeFlags) {
        mTrackingEdges = edgeFlags;
    }
Enable edge tracking for the selected edges of the parent view.
The callback's {@link Callback#onEdgeTouched(int, int)} and
{@link Callback#onEdgeDragStarted(int, int)} methods will only be invoked
for edges for which edge tracking has been enabled.

@param edgeFlags Combination of edge flags describing the edges to watch
@see #EDGE_LEFT
@see #EDGE_TOP
@see #EDGE_RIGHT
@see #EDGE_BOTTOM
app/src/main/java/home/smart/fly/animations/widget/slidepanel/ViewDragHelper.java