Core theme

• Intro

• Life Cycle:

  6个核心回调

  onCreate(), onStart(), onResume(), onPause(), onStop(), onDestroy()

`onCreate()`: called once activity create but not yet visible and it's where u should do any one type initializations

## Timber

![https://s3-us-west-2.amazonaws.com/secure.notion-static.com/79d57c0e-34c6-44d4-b01b-6f8dc4252f82/Untitled.png](https://s3-us-west-2.amazonaws.com/secure.notion-static.com/79d57c0e-34c6-44d4-b01b-6f8dc4252f82/Untitled.png)

[https://s3-us-west-2.amazonaws.com/secure.notion-static.com/463d3e25-23d9-410c-a5a5-4cb4b27ac1f8/activity-lifecycle-worksheet.pdf](https://s3-us-west-2.amazonaws.com/secure.notion-static.com/463d3e25-23d9-410c-a5a5-4cb4b27ac1f8/activity-lifecycle-worksheet.pdf)

activity lifecycle