Flutter shared_preferences not persistent?

Question

I have been using shared_preferences in flutter, was working fine until now. Suddenly it stopped working, both in iOS and Android. I debugged it step by step and it stores data to pref and while app is on, data still persists, but after hot restart _preferencecache always is empty. How can I solve this? (version is 0.5.12)

When user logs in I save the user_id:

final prefs = await SharedPreferences.getInstance();
 final userData = json.encode(
  {
    'user_id': userID,
  },
 );
prefs.setString('userData', userData);

Later, when user restarts again:

final prefs = await SharedPreferences.getInstance();
if (!prefs.containsKey('userData')) {
// print("no user data in shared preference");
  return false;
}

But the abpve function returns false, that's the issue, I checked the previous version of shared_preferences as well, but no solution.

Answer 1

I realized I was clearing my shared preferences some where in my app and I had forgotten about it. Please check every where in your code for sharedPreferences.clear(). You never know.

Answer 2

You can check this solution. As mentioned, you need to call the SharedPreference instance in initState.