Using save files on android, created originally in Unity

Questions
#1

Hi, I’m switching from Unity to Defold and currently rewriting my quiz games.

On android, I want to use the save files created in game, but I just can’t get access to the directory they are saved to.

The ads plugin I use is saving in the same location as the save files, so I know it’s possible.
From the Unity manual it states

Application.persistentDataPath points to /storage/emulated/<userid>/Android/data/<packagename>/files on most devices (some older phones might point to location on SD card if present), the path is resolved using android.content.Context.getExternalFilesDir

Any ideas please?

#2

If it’s Unity PlayerPrefs, try this library: GitHub - AGulev/ppreader: Defold Native Extension for reading Unity PlayerPrefs (or take a look how it’s implemented)

#3

Thank you. It seems ppreader is using the data/data/… directory on android (the one Defold is using for saves). I think I need access to the emulated directory which uses a userid.

#4

Did you try using io library to access files in that folder? If it’s succeed then you can move to next step, you can fork extension-directories and make some modifications for getting external files dir

#5

I haven’t tried to access the folder, but only due to the userid in the path name - I don’t have the slightest idea what that is even on my own phone!
Forking extension-directories is well beyond my skill level, but I could try to write the Java code to access android.context.Context.getExternalFilesDir based on other plugins (which may be beyond my skill level too!)

#6

Forking a github repository is super easy. You can even make modifications directly on github. The extension already has structure just add your stuff. I believe you can do that just few minutes. But if you want to create an extension yourself then go ahead, time to practice it :slight_smile:

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#7

When I tested this extension I tested that it gets files from where unity writes its PlayerPrefs, but if you write something in some of your custom folders then it will not fit for sure.

#8

I used the Easy Save plugin to create the save files, and it uses the persistentDataPath as the folder location for saves. You can see the files in a file browser, right along with the Unity Ads cache, so I should be able to use it - I just don’t know my way around Java, so wish me luck!

1 Like
#9

I’m attempting to write my first extension for this based on the code for a battery extension on the Assets Portal.

Of course it doesn’t work, could somebody please have a look - it’s probably a complete mess!

#10

Not sure but you could try this

jmethodID method = env->GetStaticMethodID(cls, "GetDirectory", "(Landroid/content/Context;)Ljava/lang/String;");

jstring return_value = (jstring)env->CallStaticObjectMethod(cls, method, dmGraphics::GetNativeAndroidActivity());
const char* dir_path = env->GetStringUTFChars(return_value, 0);
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#11

Thank you so much - no chance I would have got there without your help!

1 Like