请问安卓工程中怎么实现edittext中输入一段文字 在textview中弹出另一段文字（不同文字）

et.addTextChangedListener(new TextWatcher(){

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

        }

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

        }

        @Override
        public void afterTextChanged(Editable s) {
            // TODO Auto-generated method stub
            if(et.getText().toString().compareTo("1") == 0)
            {
                tv.setText("11");
            }
            else if(et.getText().toString().compareTo("2") == 0)
            {
                tv.setText("222");
            }
            else
            {
                tv.setText("3333"+et.getText());
            }

        }

    });

et.getText().toString() == "2" 测试了下比较不了 用这个et.getText().toString().compareTo("1") == 0就可以