android - How can I implement filter in Navigation Drawer List Item -

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i have long list item on navigation drawer, have added edittext on top of it, implemented filterable on custom adapter, application crashes when add line of code

edittext searchsongs = (edittext)findviewbyid(r.id.searchinput);      if(adapter != null) {         searchsongs.addtextchangedlistener(new textwatcher() {             @override             public void beforetextchanged(charsequence s, int start, int count, int after) {              }              @override             public void ontextchanged(charsequence s, int start, int before, int count) {                 //adapter.getfilter().filter(s);             }              @override             public void aftertextchanged(editable s) {              }         });     }

if remove code works well, when comment out getfilter method, still crashes.


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