Why should I use Bundle if I can pass values to new Activity by putting it directly to Intent extras?

Copied from https://stackoverflow.com/questions/15243798/advantages-of-using-bundle-instead-of-direct-intent-putextra-in-android

Bundle 是数据（键值对集合）。Intent 是 Android 很重要的一种机制，可以定义要执行的操作、要操作的数据（通过 Extras 携带数据，Bundle 是可以携带的数据类型之一）。Intent 的内涵要远比 Bundle 大的多。

这个问题主要是困惑于，既然 intent extras 和 Bundle 都可以携带数据，用哪一种有什么优势吗？

1. The code using an additional bundle is slightly easier to manage, being more general. If one day you decide that - before sending information inside an intent - you want to serialize the data to database - it will be a bit cleaner to have a bundle that you can serialize, all with one object.

2. Once data is put in a Bundle, you can send the same data through multiple intents.

3. you can isolate their creation/reading more easily, therefore separating the code handling the bundles from the code of the UI.