Have a program that USES baidumapapi_v2_4_0 in using mMKSearch. WalkingSearch (" xx ", stNode "xx", enNode); Want to draw up the trail, the callback function to public void onGetWalkingRouteResult (MKWalkingRouteResult result, int arg1) step through and found the result is always null arg1 has a value of 100. Excuse me, is there any know what the situation of the works, the program of 18 years,