android Textview文字监控(Textview使用方法)

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

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);
            }
        }
    };