[android-developers] Re: LVL: possible to check license for a different app?

Does any-one has a solution to this? I would really need this to work! Isn't there any way to check the license of one package from another package?

On Thursday, January 23, 2014 8:47:16 AM UTC+1, 3c wrote:

Hello, I was really wondering the same thing (for a different purpose), however no-one clearly answered your original question here, so I've actually tested it directly.

First thing, I had to modify the LVL library to take a package name and version code as parameter instead of using the current app's information automatically.

Without the other paid app installed, I received a ERROR_INVALID_PACKAGE_NAME.

Once the other paid app was installed, I unfortunately received a ERROR_NON_MATCHING_UID.

As I couldn't find any UID information in the LVL library, the answer is now pretty clear: it's not possible.

On Thursday, January 6, 2011 1:27:25 AM UTC+1, andfan22 wrote:

Hi all

Just wondering if I can use LVL to check that the user is licensed to
use a DIFFERENT app from the current one -- ie. one with a different
package name.

Why would I want to do this?  I'm developing an app which I'm
considering publishing using a free + pro license model.  The main app
would be a free, ad supported app.  To turn off ads the user would
purchase a pro license key from the market (published as a paid app
containing no functionality).  The user would continune to use the app
that was downloaded for free, which checks if the paid app is
installed, and if so it disables ads.   I prefer this model to a fully
featured paid app model, as it eliminates the need to migrate data
from the free version to the paid when the user upgrades.

Under this model I would like the free app to check if the paid app is
installed, and if so the free app would then use LVL to check if the
user has purchased the paid app via the market.  Will it be possible
for the free app to pass the package name of the paid app to LVL, and
to get back a result confirming whether the paid app has been
purchased or not?

Looking at the LVL source code I suspect I can do this by modifying
the constructor of LicenseChecker to set mPAckageName to a supplied
argument rather than setting it to mContext.getPackageName().

Are there any gotcha's I may be missing?

Thanks ...

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