Android : savedInstanceState null when launching application

Android : I always have savedInstanceState == null when I relaunch my app. I have a fragment where I want to store / reuse data after stopping the application.

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setHasOptionsMenu(true);
    mPrefs = android.preference.PreferenceManager.getDefaultSharedPreferences(getActivity());

    if (savedInstanceState != null) {
        mLoading = savedInstanceState.getBoolean(OUTSTATE_LOADING, false);
        mCurrentFiliere = savedInstanceState.getInt(OUTSTATE_CURRENT_FILIERE, 0);
    }
}

@Override
public void onSaveInstanceState(@NonNull Bundle savedInstanceState) {
    super.onSaveInstanceState(savedInstanceState);
    savedInstanceState.putInt(OUTSTATE_CURRENT_FILIERE, mCurrentFiliere);
}

@Override
public void onViewStateRestored(@Nullable Bundle savedInstanceState) {
    super.onViewStateRestored(savedInstanceState);
    if (savedInstanceState != null) {
        mCurrentFiliere = savedInstanceState.getInt(OUTSTATE_CURRENT_FILIERE);
    }
}

Both methods onCreate and onViewStateRestored return null

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@android:id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <ProgressBar
        android:id="@android:id/progress"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:indeterminate="true"
        android:visibility="gone" />
</FrameLayout>

And I haven't found any answer in other posts...

Solution

Well, due to a lack of comprehension of me of the saves on Android, my question isn't very good because my code works fine! Indeed if I don't close my application, I don't lose any data. My issue was how to conserve data when I close my application and the answer is to use preferences. And this way i can close my application and relaunch it without losing the saved data. It's obvious when we know the correct way to save.... My mistake was (very simply): savedInstanceState save between onCreate and onStop and preferences save when you are on onDestroy