How to disable Button if EditText is empty ?

by 
    editText1.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {

           if(s.toString().trim().length()==0){
                button.setEnabled(false);
              } else {
                button.setEnabled(true);
              }
        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {
            // TODO Auto-generated method stub

        }

        @Override
        public void afterTextChanged(Editable s) {
            // TODO Auto-generated method stub

        }
    });

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