<uses-permission android:name="android.permission.SEND_SMS" />
<uses-permission android:name="android.permission.RECEIVE_SMS" />
<uses-permission android:name="android.permission.READ_SMS" />
<uses-permission android:name="android.permission.WRITE_SMS" />

mContext = context;
//獲取短信的bundle
Bundle bundle = intent.getExtras();
//短信對象
SmsMessage msg;
if (null != bundle) {
 //獲取pdu編碼的短信數(shù)組（接受的短信都是以pdu編碼的16進制數(shù)組）
 Object[] smsObj = (Object[]) bundle.get("pdus");
 for (Object object : smsObj) {
  //將pdu編碼的短信解析為SmsMessage對象
  msg = SmsMessage.createFromPdu((byte[]) object);
  //獲取短信內(nèi)容
  String msgBody = msg.getDisplayMessageBody();
  //獲取發(fā)送短信的號碼
  String number = msg.getOriginatingAddress();
  //獲取短信時間戳
  long time = msg.getTimestampMillis();
  //獲取我們在主頁面設置的要回復短信的關鍵字及短信內(nèi)容的bean
  List<SmSBean> smsList = ShareUtil.getInstance(context).getSMS();
  for (SmSBean bean : smsList) {
   //判斷短信內(nèi)容是否包含設置的關鍵字
   if (!TextUtils.isEmpty(msgBody) && msgBody.contains(bean.key)) {
    //如果包含，則自動發(fā)送短信
    AutoSendSms(bean.content, context, number, time, msgBody);
    break;
   }
  }
 }
}

/**
 * 發(fā)送短信的方法
 * @param msg 發(fā)送的短信內(nèi)容
 * @param context 上下文對象
 * @param number 接受短信的號碼
 * @param time 時間戳
 * @param msgBody 接受到的短信
 */
private void AutoSendSms(String msg, Context context, String number, long time, String msgBody) {
 //獲取短信管理器
 SmsManager SM = SmsManager.getDefault();
 //通過反射獲取短信管理類
 Class SMClass = SmsManager.class; //通過反射查到了SmsManager有個叫做mSubId的屬性
 // 創(chuàng)建發(fā)送短信意圖
 Intent sentIntent = new Intent(SENT_SMS_ACTION);

 Field field = null;
 try {
  field = SMClass.getDeclaredField("mSubId");
  field.setAccessible(true);
  try {
   //獲取發(fā)送短信的卡
   int smsType = ShareUtil.getInstance(context).getSMSType();
   field.set(SM, smsType);
   //1.136
   //0.155
   sentIntent.putExtra("address", number);
   sentIntent.putExtra("msg", msg);
   sentIntent.putExtra("time", time);
   sentIntent.putExtra("msgBody", msgBody);
   PendingIntent sentPI = PendingIntent.getBroadcast(context, 0, sentIntent,0);
   //自動發(fā)送短信
   SM.sendTextMessage(number, null, msg, sentPI, null);
   Log.e("TAG", "onCreate: sendTextMessage");
  } catch (IllegalAccessException e) {
   e.printStackTrace();
  }
 } catch (NoSuchFieldException e) {
  e.printStackTrace();
 }
}

public class SmsService extends Service {
 private static final String TAG = SendSMSService.class.getSimpleName();
 @Nullable
 @Override
 public IBinder onBind(Intent intent) {
  return null;
 }
 @Override
 public void onCreate() {
  super.onCreate();
  new Handler().postDelayed(new Runnable() {
   @Override
   public void run() {
    Toast.makeText(SendSMSService.this, "SmsService------------", Toast.LENGTH_SHORT).show();
   }
  }, 10000);
 }
}

<receiver android:name=".SmsBroadcastReceiver">
 <intent-filter android:priority="999">
  <action android:name="android.provider.Telephony.SMS_RECEIVED" />
 </intent-filter>
</receiver>

<service android:name=".SmsService" />

mRgSim.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
 @Override
 public void onCheckedChanged(RadioGroup group, int checkedId) {
  switch (checkedId) {
   case R.id.rb_1:
 simType = 0;
    ShareUtil.getInstance(MainActivity.this).saveSMSType(simType);
    break;
   case R.id.rb_2:
    simType = 1;
    ShareUtil.getInstance(MainActivity.this).saveSMSType(simType);
    break;
   default:
    ShareUtil.getInstance(MainActivity.this).saveSMSType(simType);
    break;
  }
 }
});

//保存關鍵字及回復內(nèi)容
mEtSave.setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
  //關鍵字
  String key = mEtKey.getText().toString().trim();
  //回復的內(nèi)容
  String content = mEtContent.getText().toString().trim();
  //保存關鍵字及內(nèi)容的bean
  SmSBean bean = new SmSBean(key, content);
  //獲取之前已添加的關鍵字及內(nèi)容
  init();
  //添加新的關鍵字及內(nèi)容
  mDataList.add(bean);
  //用sharePreference保存關鍵字及內(nèi)容對象集合
  ShareUtil.getInstance(MainActivity.this).saveSMS(mDataList);
  //將關鍵字及內(nèi)容輸入框置空
  mEtKey.setText("");
  mEtContent.setText("");
 }
});