getAllCellInfo() method return null

Question

I have the above code and before the insert of try-catch I had this error at logcat

java.lang.NullPointerException: Attempt to invoke interface method 'java.util.Iterator java.util.List.iterator()' on a null object reference

The problem was into the for loop for the List cellInfoList. Where exactly is the problem.

List<CellInfo> cellInfoList = tm.getAllCellInfo();
            try {
                for (final CellInfo info : cellInfoList) {
                    if (info instanceof CellInfoLte) {
                        final CellSignalStrengthLte lte = ((CellInfoLte) info).getCellSignalStrength();
                        final CellIdentityLte identityLte = ((CellInfoLte) info).getCellIdentity();
                        test1 = lte.getDbm();
                        //lte.getTimingAdvance();
                        test2 = identityLte.getMcc();
                        //identityLte.getMnc();
                        test3 = identityLte.getCi();
                    }
                }
            } catch (Exception e) {
                Log.e(TAG, "Unable to obtain cell signal information", e);
            }

Thank you

@SantanuSur tm is this `TelephonyManager tm = (TelephonyManager) getActivity().getSystemService(Context.TELEPHONY_SERVICE);` — Edward M, Mar 05 '19 at 19:43
make sure you have added the necessary permissions in the manifest ! — Santanu Sur, Mar 05 '19 at 19:50

score 0 · Answer 1 · answered Mar 05 '19 at 20:07

0

Eventually,the problem was from my device that is not let me to take these informations to fill up the array.In another smartphone it works fine. Thank you

answered Mar 05 '19 at 20:07

Edward M

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getAllCellInfo() method return null

1 Answers1