EditText内容的动态监听方法

   ed_plnr.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) {            if(s.toString()!="") {                iv_fs.setBackgroundResource(R.drawable.bt_concer_yhq);                iv_fs.setTextColor(Color.WHITE);            }        }        @Override        public void afterTextChanged(Editable s) {        }    });}