1.首先给用户添加一个textchangedlistener
2.然后再写一个文字变化的监视器

复制代码 代码如下:
mobile_et.addTextChangedListener(textWatcher);

    /**
     * 实时监听用户输入的手机号，输入至最后一位后，计算折扣后的金额
     */
    TextWatcher textWatcher = new TextWatcher() {

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

        }

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

        }

        @Override
        public void afterTextChanged(Editable s) {
            if(s.length() == 11){
                String amountYuan = amount_et.getText().toString();//用户选择的金额+元
                String mobileNum = mobile_et.getText().toString().trim();
                int tMobile = Utils.getMobileOp(mobileNum);

                String disAmount= getDisAmount(tMobile, amountYuan);
                amount_discount_tv.setText(disAmount);
            }
        }
    };