EditText:监听输入后的操作

  sure_detailPwd.addTextChangedListener(new TextWatcher() {            @Override            public void onTextChanged(CharSequence s, int start, int before, int count) {            }            @Override            public void beforeTextChanged(CharSequence s, int start, int count, int after) {            }            @Override            public void afterTextChanged(Editable s) {                if (TextUtils.isEmpty(s)) {                    sure_detailPwdFlag = false;                } else {                    sure_detailPwdFlag = true;                }                mHandler.sendEmptyMessage(4);            }        });    }