public class SMSBroadcastReceiver extends BroadcastReceiver {

  private static MessageListener mMessageListener;

  public SMSBroadcastReceiver() {
    super();
  }

  @Override
  public void onReceive(Context context, Intent intent) {
      public static final String SMS_RECEIVED_ACTION = "android.provider.Telephony.SMS_RECEIVED";
      if (intent.getAction().equals(SMS_RECEIVED_ACTION)) {
        Object[] pdus = (Object[]) intent.getExtras().get("pdus");
        for(Object pdu:pdus) {
          SmsMessage smsMessage = SmsMessage.createFromPdu((byte [])pdu);
          String sender = smsMessage.getDisplayOriginatingAddress();
          //短信内容
          String content = smsMessage.getDisplayMessageBody();
          long date = smsMessage.getTimestampMillis();
          Date tiemDate = new Date(date);
          SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
          String time = simpleDateFormat.format(tiemDate);

          //过滤不需要读取的短信的发送号码，博主这里用的是关键词过滤，小伙伴们也可以用电话号去过滤
          if (content.contains("***")&&content.contains("****")
              &&content.contains("***")) {
            //从短信内容中获取验证码
            String code=getCode(content,6);
             //回调数据
            mMessageListener.onReceived(code);
            abortBroadcast();
          }
        }
      }

  }

  //回调接口
  public interface MessageListener {
    public void onReceived(String message);
  }

  public void setOnReceivedMessageListener(MessageListener messageListener) {
    this.mMessageListener = messageListener;
  }

  public static String getCode(String body, int YZMLENGTH) {
    // 首先([a-zA-Z0-9]{YZMLENGTH})是得到一个连续的YZMLENGTH位数字字母组合
    // (?<![a-zA-Z0-9])负向断言([0-9]{YZMLENGTH})前面不能有数字
    // (?![a-zA-Z0-9])断言([0-9]{YZMLENGTH})后面不能有数字出现


    // 获得数字字母组合
    //  Pattern p = Pattern  .compile("(?<![0-9])([a-zA-Z0-9]{" + YZMLENGTH + "})(?![a-zA-Z0-9])");

    // 获得纯数字
    Pattern p = Pattern.compile("(?<![0-9])([0-9]{" + YZMLENGTH+ "})(?![0-9])");

    Matcher m = p.matcher(body);
    if (m.find()) {
      System.out.println(m.group());
      return m.group(0);
    }
    return null;
  }
}

private void initSmsReader(){
    public static final String SMS_RECEIVED_ACTION = "android.provider.Telephony.SMS_RECEIVED";
    //生成广播处理
    mSMSBroadcastReceiver = new SMSBroadcastReceiver();

    //实例化过滤器并设置要过滤的广播
    IntentFilter intentFilter = new IntentFilter(SMS_RECEIVED_ACTION);
    //设置优先级
    intentFilter.setPriority(Integer.MAX_VALUE);
    //注册广播
    this.registerReceiver(mSMSBroadcastReceiver, intentFilter);

    mSMSBroadcastReceiver.setOnReceivedMessageListener(new SMSBroadcastReceiver.MessageListener() {
      @Override
      public void onReceived(String message) {
    //在相应的编辑框中填写验证码
        passCode.setText(message);

      }
    });
  }

  @Override
  protected void onStart() {
    super.onStart();
    initSmsReader();
  }

  @Override
  protected void onDestroy() {
    super.onDestroy();
    //注销短信监听广播
    this.unregisterReceiver(mSMSBroadcastReceiver);
  }