1、创建一个Utils类，正则匹配手机号码

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Utils {
    /**
     * 正则匹配手机号码:
     */
    public static boolean checkTel(String tel){
        Pattern p = Pattern.compile("^[1][3,4,5,7,8,9][0-9]{9}$");
        Matcher matcher = p.matcher(tel);
        return matcher.matches();
    }
}
2、引用类

private EventHandler eh;   //事件处理者

eh = new EventHandler() {}；

//注册一个事件回调监听，用于处理SMSSDK接口请求的结果
SMSSDK.registerEventHandler(eh);

phoneNum = editTextPhoneNum.getText().toString();
if(!phoneNum.isEmpty()){
    if(Utils.checkTel(phoneNum)){ //利用正则表达式获取检验手机号
        // 获取验证码
        SMSSDK.getVerificationCode("86", phoneNum);
    }else{
        Toast.makeText(getApplicationContext(),"请输入有效的手机号",Toast.LENGTH_LONG).show();
    }
}else {
    Toast.makeText(getApplicationContext(),"请输入手机号",Toast.LENGTH_LONG).show();
    return;
}

phoneNum = editTextPhoneNum.getText().toString();