Android PackageStats gives negative Values

Question

I am using PackageStats and on printing the PackageStats's codeSize, cacheSize, dataSize, some data is coming as negative.

A few questions:

How is this possible?
What are the scenarios when codeSize could be negative considering the apk size is around 50MB?
Any other ways which can be reliably used to extract above information?

Also, for Android N it gives me "NoSuchMethodException".So,

Is it removed for Android N or is there some way to use it?
Any alternatives that could help me calculate the above sizes?

Code:

PackageManager packageManager = context.getPackageManager();
Method myUserId = UserHandle.class.getDeclaredMethod("myUserId");
int userID = (Integer) myUserId.invoke(packageManager);

Method getPackageSizeInfo = packageManager.getClass().getDeclaredMethod("getPackageSizeInfo", String.class, int.class,
IPackageStatsObserver.class);
getPackageSizeInfo.invoke(packageManager, context.getPackageName(), userID, new IPackageStatsObserver.Stub() {

    @Override
    public void onGetStatsCompleted(PackageStats pStats, boolean succeeded) throws RemoteException {
        long codeSize = pStats.codeSize / MB; //long MB = 1024*1024;
        long cacheSize = pStats.cacheSize / MB;
        long dataSize = pStats.dataSize / MB;
        long appSize = codeSize + cacheSize + dataSize;
    };
}

Could you add a code example including how you are displaying / checking the value as well as any calculations being performed on that value? — Zachary, Sep 18 '16 at 12:12
Ok sure. I am not performing any calculations except 1 wherein I divide the values by 1024*1024 to get the value in MB. — thepace, Sep 18 '16 at 12:32

Martin Zeitler · Answer 1 · 2016-09-21T09:52:59.910

1

just tried on API 23/24 and can just instance it.

these external* properties might refer to the SD card.

    PackageStats stats = new PackageStats(context.getPackageName());
    long codeSize  = stats.codeSize + stats.externalCodeSize;
    long dataSize  = stats.dataSize + stats.externalDataSize;
    long cacheSize = stats.cacheSize + stats.externalCacheSize;
    long appSize   = codeSize + dataSize + cacheSize;

edited Sep 21 '16 at 09:52

answered Sep 21 '16 at 09:11

Martin Zeitler

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I agree with you. One other way is if it exceeds long which is possible. What do you mean by just instance it? – thepace Sep 21 '16 at 09:21
@thepace with "just instance it" I mean the `new` keyword - without `invoke()` and the `onGetStatsCompleted()`. negative values are basically only possible with signed integer, so the maximum might not be 4294967295, but 2147483647 (while -2147483647 might simply indicate an error or an absent value)... while it indeed matters which user runs the code, since there is application, user-private and user-shared storage - and the user-private area might vary in size. – Martin Zeitler Sep 21 '16 at 09:46
could you share the exact command to get the size (as you suggested with onGetStatsCompleted not required) – thepace Sep 21 '16 at 11:07
It gives zero every time. I doubt it works because if it were that simple everyone would be using it. http://stackoverflow.com/questions/1806286/getting-installed-app-size – thepace Sep 22 '16 at 06:23
Only instantiating will never give you the size of the application. Have a look at line number 16562 of PackageManagerService class where you can find how the Package sized is initialized. The actual calculation for size is done in Installer class – Anirudha Agashe Sep 23 '16 at 06:06
@thepace I don't think it's plausible that a stat exceeds a Long. There's not enough memory on today's devices to do that. – M. Prokhorov Dec 28 '17 at 07:56

Android PackageStats gives negative Values

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