What does Java – (savedinstancestate) mean

There are some codes in my main activities

if (savedInstanceState != null) {
            mCurrentSelectedPosition = savedInstanceState.getInt(STATE_SELECTED_POSITION);
            mFromSavedInstanceState = true;

I don't quite understand the meaning of (savedinstancestate) in this code Someone can tell me what it means in this case, because I'm a bit like a rookie. I want to know the code so that I can learn it, understand it, and even copy it when necessary

Solution

Quoted from（ http://developer.android.com/training/basics/activity-lifecycle/recreating.html )：

In addition, if you save the state of the application in a package (usually non persistent dynamic data in onsaveinstancestate), if you need to recreate the activity (for example, direction change), you can pass it back to oncreate so that you won't lose this previous information Savedinstancestate is null if no data is provided