实际上 ConsumeFromWhere 的枚举类源码中还有另外三个值，但是已经被弃用了。但是这个配置仅对新的 ConsumerGroup 有效，已经存在的 ConsumerGroup 会继续按照上次消费到的 Offset 继续消费。

其实也很好理解，假设有 1000 条消息，你的服务已经消费到了 500 条了，然后你上线新的东西将服务重新启动，然后又从头开始消费了？这不扯吗？
这里我们传的是 *，代表订阅所有类别的消息。当然我们也可以传入 tagA || tagB || tagC 这种，代表我们只消费打了这三种 Tag 的消息。

RocketMQ 会根据我们传入的这两个参数，构造出 SubscriptionData ，放入一个位于内存的 ConcurrentHashMap 中维护起来，简单来说就一句话，把这个订阅的 Topic 缓存下来。

在缓存完之后会进行一个比较关键的操作，那就是开始向所有的 Broker 发送心跳。Consumer 客户端会将：

打包APK
Android 要求所有应用都有一个数字签名才会被允许安装在用户手机上，所以在把应用发布到类似�0�2Google Play store这样的应用市场之前，你需要先生成一个签名的 APK 包。Android 开发者官网上的�0�2如何给你的应用签名文档描述了签名的细节。本指南旨在提供一个简化的签名和打包 js 的操作步骤，不会涉及太多理论。

生成一个签名密钥
你可以用keytool命令生成一个私有密钥。在 Windows 上keytool命令放在 JDK 的 bin 目录中（比如C:\Program Files\Java\jdkx.x.x_x\bin），你可能需要在命令行中先进入那个目录才能执行此命令。

$ keytool -genkeypair -v -keystore my-release-key.keystore -alias my-key-alias -keyalg RSA -keysize 2048 -validity 10000

这条命令会要求你输入密钥库（keystore）和对应密钥的密码，然后设置一些发行相关的信息。最后它会生成一个叫做my-release-key.keystore的密钥库文件。

在运行上面这条语句之后，密钥库里应该已经生成了一个单独的密钥，有效期为 10000 天。--alias 参数后面的别名是你将来为应用签名时所需要用到的，所以记得记录这个别名。

注意：请记得妥善地保管好你的密钥库文件，一般不要上传到版本库或者其它的地方。

Gradle 的assembleRelease参数会把所有用到的 JavaScript 代码都打包到一起，然后内置到 APK 包中。如果你想调整下这个行为（比如 js 代码以及静态资源打包的默认文件名或是目录结构等），可以看看android/app/build.gradle文件，然后琢磨下应该怎么修改以满足你的需求。

在把发行版本提交到 Play Store 之前，你应该做一次最终测试。输入以下命令可以在设备上安装发行版本：

$ react-native run-android --variant=release

注意variant=release参数只能在你完成了上面的签名配置之后才可以使用。你现在可以关掉运行中的 packager 了，因为你所有的代码和框架依赖已经都被打包到 apk 包中，可以离线运行了。

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