通过监听短信的广播去分析短信的内容。
@Override
public void onReceive(Context context, Intent intent) {
    sharedPreferencesHelper = new SharedPreferencesHelper(
            context, "anhua");
    String action = intent.getAction();
    //判断广播消息
    if (action.equals(SMS_RECEIVED_ACTION)){
        Bundle bundle = intent.getExtras();
        //如果不为空
        if (bundle != null){
            //将pdus里面的内容转化成Object[]数组
            Object pdusData[] = (Object[]) bundle.get("pdus");
            //解析短信
            SmsMessage[] msg = new SmsMessage[pdusData.length];
            for (int i = 0;i < msg.length;i++){
                byte pdus[] = (byte[]) pdusData[i];
                msg[i] = SmsMessage.createFromPdu(pdus);
            }
            StringBuffer content = new StringBuffer();//获取短信内容
            StringBuffer phoneNumber = new StringBuffer();//获取地址
            StringBuffer receiveData = new StringBuffer();//获取时间
            //分析短信具体参数
            for (SmsMessage temp : msg){
                content.append(temp.getMessageBody());
                phoneNumber.append(temp.getOriginatingAddress());
                receiveData.append(new SimpleDateFormat("yyyy-MM-dd hh:mm:ss.SSS")
                        .format(new Date(temp.getTimestampMillis())));
            }
           String myNumber="+86"+sharedPreferencesHelper.getSharedPreference("number", "暂未设置告警号码").toString().trim();
            //判断是否是告警电话
            if(phoneNumber.toString().equals(myNumber)){
                Toast.makeText(context,"这是告警"+phoneNumber.toString()+content+receiveData, Toast.LENGTH_LONG).show();//短信内容
                //如果是告警电话，需要有语音提示
                Intent intent1 = new Intent(context,PlayingMusicServices.class);
                context.startService(intent1);
            }
            /**
             * 这里还可以进行好多操作，比如我们根据手机号进行拦截（取消广播继续传播）等等
             */
            else{
                //Toast.makeText(context,"着不是告警"+phoneNumber.toString()+content+receiveData, Toast.LENGTH_LONG).show();//短信内容
            }
        }
    }
}

  写一个播放音乐的services，播放本地音乐
  public class PlayingMusicServices extends Service {
 private MediaPlayer mp;
@Override
public void onStart(Intent intent, int startId) {
    // TODO Auto-generated method stub
    // 开始播放音乐
    mp.start();
    // 音乐播放完毕的事件处理
    mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
        public void onCompletion(MediaPlayer mp) {
            // TODO Auto-generated method stub
            // 循环播放
            try {
                mp.start();
            } catch (IllegalStateException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    });
    // 播放音乐时发生错误的事件处理
    mp.setOnErrorListener(new MediaPlayer.OnErrorListener() {
        public boolean onError(MediaPlayer mp, int what, int extra) {
            // TODO Auto-generated method stub
            // 释放资源
            try {
                mp.release();
            } catch (Exception e) {
                e.printStackTrace();
            }

            return false;
        }
    });
    super.onStart(intent, startId);
}
@Override
public void onCreate() {
    // TODO Auto-generated method stub
    // 初始化音乐资源
    try {
        // 创建MediaPlayer对象
        mp = new MediaPlayer();
        // 将音乐保存在res/raw/xingshu.mp3,R.java中自动生成{public static final int xingshu=0x7f040000;}
        mp = MediaPlayer.create(PlayingMusicServices.this, R.raw.music1);
        // 在MediaPlayer取得播放资源与stop()之后要准备PlayBack的状态前一定要使用MediaPlayer.prepeare()
        mp.prepare();
    } catch (IllegalStateException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    super.onCreate();
}
@Override
public void onDestroy() {
    // TODO Auto-generated method stub
    // 服务停止时停止播放音乐并释放资源
    mp.stop();
    mp.release();
    super.onDestroy();
}
@Override
public IBinder onBind(Intent intent) {
    // TODO Auto-generated method stub
    return null;
}
}

   <application
    android:allowBackup="true"
    android:icon="@mipmap/icon"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <!-- action:name = 的名称是固定的 -->
    <receiver android:name=".NoteReceiver">
        <intent-filter android:priority="1000">
            <action android:name="android.provider.Telephony.SMS_RECEIVED"/>
        </intent-filter>
    </receiver>
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <service
        android:name=".PlayingMusicServices"
        android:exported="true"
        android:process=":remote">
    </service>
</application>