本文介绍了如何在Android应用中保存和恢复Activity的状态信息。通过实现onSaveInstanceState()方法，开发者可以将关键的数据存储到Bundle对象中，从而确保在设备配置改变（如屏幕旋转）时，应用能够正确地恢复到之前的状态。文章还提到了在onCreate()方法中检查Bundle是否为空的重要性，并解释了onRestoreInstanceState()方法的调用时机。
1.
Save Your Activity State
1.1
To save additional state information for your activity, you must implement onSaveInstanceState() and add key-value pairs to the Bundle object.
2.
Restore Your Activity State
2.1
onCreate()，you must check whether the state Bundle is null before you attempt to read it.
2.2
The system calls onRestoreInstanceState() only if there is a saved state to restore, so you do not need to check whether the Bundle is null
To learn more about recreating your activity due to a restart event at runtime (such as when the screen rotates), read Handling Runtime Changes.
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