events - Android: Numeric key register backspace pressed -


i have edittext accepts numeric numbers defined this:

<edittext android:id="@+id/routeinit_price"      android:layout_height="wrap_content"     android:layout_width="120dp"     android:layout_gravity="center_horizontal"     android:lines="1"     android:inputtype="numberdecimal"/>

i validating if there valid input below enable/disable button. however, doesn't receive event on backspace/delete button pressed event. how can fix that? because when edittext empty button should diabled.

edittext pricefield = (edittext)findviewbyid(r.id.routeinit_price); pricefield.setonkeylistener(new view.onkeylistener() {         @override         public boolean onkey(view view, int keycode, keyevent keyevent) {             if(keyevent.getaction() == keyevent.action_up)             {                 if(((edittext)view).gettext().tostring().length() > 0)                     ready.setenabled(true);                  else                     ready.setenabled(false);             }              return false;         } });

try 

pricefield.addtextchangedlistener(new textwatcher() {          @override         public void ontextchanged(charsequence s, int start, int before, int count) {              if(pricefield.gettext().tostring().length() > 0)                 ready.setenabled(true);              else                 ready.setenabled(false);         }          @override         public void beforetextchanged(charsequence s, int start, int count, int after) {          }          @override         public void aftertextchanged(editable s) {          }     });

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