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);

}

}

};