PlayerPrefs persist on fresh install.

I'm running into a weird bug that loads a previously saved state in my Unity Editor when I do a fresh Android install.

I'm currently using the new Unity 2019.2

1. My game keeps track of 3 things: Coins, Stars and Levels Unlocked (connected to how many Stars you have).
2. I played around in Unity and collected 200 coins, 37 stars and 2 levels unlocked.
3. When I do a fresh install on an Android device - it starts with 0 coins, 0 stars and 0 levels unlocked.
4. If I force close the app and restart it - it shows 200 coins, 37 stars and 2 levels unlocked.

It's remembering my Unity saved state.

What's even more odd is that if I play the game on Android for a bit and collect some coins and stars and then force restart it - it will remember how many coins I collected, but the stars will reset back to 37.

5. I collect 350 coins, 55 stars and 3 levels unlocked then force close and restart - it shows 350 coins (correct), 37 stars and 2 levels.

It has both my programmer and me stumped. Any initial thoughts?

This is the code in my Game Manager that's related to the coins and stars.

Code (CSharp):

1. public void AddCoins(int coins)
2.     {
3.         this.coins += coins;
4.     }
5.  
6.     public int coins
7.     {
8.         get
9.         {
10.             return PlayerPrefs.GetInt("coins", 0);
11.         }
12.         set
13.         {
14.             coinsAdded?.Invoke(value);
15.             PlayerPrefs.SetInt("coins", value);
16.         }
17.     }
18.  
19.     public void AddImages(int images)
20.     {
21.         this.images += images;
22.     }
23.  
24.     public int images
25.     {
26.         get
27.         {
28.             return PlayerPrefs.GetInt("images", 0);
29.         }
30.         set
31.         {
32.             unlockedImages?.Invoke(value);
33.             PlayerPrefs.SetInt("images", value);
34.         }
35.     }
36.  
37.     public void Save()
38.     {
39.         levelCreator.Save();
40.     }
41.  
42.     private void OnApplicationQuit()
43.     {
44.         Save();
45.     }

 

I don't know what you mean about PlayerPrefs in the editor when you do a fresh Android install. PlayerPrefs in the editor are stored in the Windows registry, or on Mac wherever they are normally stored there. PlayerPrefs on an Android device are not stored with the application.
https://answers.unity.com/questions/131511/playerprefs-storage-location-on-android-or-ios.html

As for sometimes not saving PlayerPrefs, where are you calling PlayerPrefs.Save()? I don't see it here.

https://docs.unity3d.com/ScriptReference/PlayerPrefs.Save.html

If you're not calling PlayerPrefs.Save() then it will automatically be called when the user exits your game, but if the game crashes or otherwise doesn't get a chance to call OnApplicationQuit then all progress up to there is lost.

 

Some users have reported PlayerPrefs not saving when using Application.Quit https://forum.unity.com/threads/and...ont-initialize-after-application-quit.665497/

 

Thanks, Jeff.

I did a bit more digging and actually found that it's the PlayerPrefs that save correctly on a force stop, but the Application.persistentDataPath does not (my programmer used both in the game). Coins are set by PlayerPrefs and Stars set to Application.persistentDataPath (Application.persistentDataPath + "/json.data")

Any ideas?

I'm trying FORCE INTERNAL build to see if that fixes the problem as found in this old question - https://answers.unity.com/questions/1223929/android-data-save-issues-does-the-install-location.html

 

@wesdaco Can you elaborate? That method is a read-only method to get a path, it does not write or save any data https://docs.unity3d.com/ScriptReference/Application-persistentDataPath.html

 

@JeffDUnity3D I'm fairly certain he just means that the Stars are saved to a data file at

Application.persistentDataPath

.

@wesdaco Is there any code to save the stars on Application.Quit? It won't do it automatically for you like PlayerPrefs seems to.