Android：从源码看onSaveInstanceState的调用条件

Posted 2022-01-01 bdmh

 Called to retrieve per-instance state from an activity before being killed so that the state can be restored in onCreate or onRestoreInstanceState (the Bundle populated by this method will be passed to both).
This method is called before an activity may be killed so that when it comes back some time in the future it can restore its state. For example, if activity B is launched in front of activity A, and at some point activity A is killed to reclaim resources, activity A will have a chance to save the current state of its user interface via this method so that when the user returns to activity A, the state of the user interface can be restored via onCreate or onRestoreInstanceState.
Do not confuse this method with activity lifecycle callbacks such as onPause, which is always called when the user no longer actively interacts with an activity, or onStop which is called when activity becomes invisible. One example of when onPause and onStop is called and not