how to get Cell Signal Strength in Lte without getAllCellInfo in android -

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i using bellow code signal strength in lte.

for (final cellinfo info : tm.getallcellinfo()) {    if (info instanceof cellinfolte) {      final cellsignalstrengthlte lte = ((cellinfolte) info).getcellsignalstrength();          lte.getdbm();   }  }

but getallcellinfo in returning null. way initialize cellsignalstrengthlte without calling tm.getallcellinfo? api version 17.


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