有没有人做过类似支付宝那种汇率换算功能的？

有没有人做过类似支付宝那种汇率换算功能的？被两个互相监听的edittext搞死，求demo

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edit_en.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 (edit_en.isFocused()) {
                    edit_zh.setHint("0");
                    edit_en.setHint("请输入金额");
                    edit_zh.setText(dollar2RMB(s.toString())+"");
                    Log.d("aa", "edit_en::" + s.toString());
                }
            }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });

        edit_zh.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 (edit_zh.isFocused()) {
                    edit_zh.setHint("请输入金额");
                    edit_en.setHint("0");
                    edit_en.setText(rmb2Dollar(s.toString()) + "");
                    Log.d("aa", "edit_zh::" + s.toString());
                }
            }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });