et.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {//在输入数据时监听
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,//输入数据之前的监听
int after) {
}
@Override
public void afterTextChanged(Editable s) {//输入数据之后监听