java - Can not retrieve CellID and LAC for the current cell -

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i tried retrieve cid , lac connected cell, using

public void getcid(){   int cid;   int lac;   gsmcelllocation xxx = new gsmcelllocation();   cid = xxx.getcid();   lac = xxx.getlac();   toast output = toast.maketext(getapplicationcontext(), "base station lac "+lac+"\n"    +"base station cid " +cid, toast.length_short);   output.show(); }

the thing -1 value both parameters (i on 2g). may wrong or there way cid , lac of current cell?

telephonymanager telephonymanager = (telephonymanager) context.getsystemservice(context.telephony_service); celllocation location = telephonymanager.getcelllocation(); gsmcelllocation gsmlocation = (gsmcelllocation) location; int cellid = gsmlocation.getcid(); int lac = gsmlocation.getlac();

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