[android-developers] Re: LVL: possible to check license for a different app?
I'm looking to do this too as i'm investigating a way to migrate from a free app + paid purchase to a free app + IAP purchase. However as 3c said, simply doing the check from another app won't work as that will result in a ERROR_INVALID_PACKAGE_NAME error. Anyone else ever migrate from a separate paid version to IAPs? How did you manage it? On Wednesday, 5 January 2011 20:27:25 UTC-4, 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 ... > -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To unsubscribe from this group and stop receiving emails from it, send an email to android-developers+unsubscr...@googlegroups.com. To post to this group, send email to android-developers@googlegroups.com. Visit this group at https://groups.google.com/group/android-developers. To view this discussion on the web visit https://groups.google.com/d/msgid/android-developers/30f28ccd-dae1-4c59-814f-04e31fbf%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[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 ... -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en --- You received this message because you are subscribed to the Google Groups Android Developers group. To unsubscribe from this group and stop receiving emails from it, send an email to android-developers+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
[android-developers] Re: LVL: possible to check license for a different app?
Educated guess: the UID may be the app's user id (UID). As far as I know, Android creates a unique user for each installed app for enforcing app-specific file system permissions. The licensing service probably checks that the requesting app process' user id matches the user id for the requested package. So it looks more like a security check and I'd assume that you cannot work around that, unless you'd run your request as that other user. And that's probably only possible on a rooted device. On Thursday, February 6, 2014 7:54:17 AM UTC-6, 3c wrote: 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 ... -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en --- You received this message because you are subscribed to the Google Groups Android Developers group. To unsubscribe from this group and stop receiving emails from it, send an email to android-developers+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
[android-developers] Re: LVL: possible to check license for a different app?
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 ... -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en --- You received this message because you are subscribed to the Google Groups Android Developers group. To unsubscribe from this group and stop receiving emails from it, send an email to android-developers+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
[android-developers] Re: LVL: possible to check license for a different app?
Thanks Zsolt - I agree I need to modify the LVL classes. I was just wondering if the change I had in mind is workable or if something would break when attempting to check the license of a different package. (I'll try it in due course, just don't want to start down a fruitless path if that can be avoided.) Cheers. On Jan 6, 8:11 pm, Zsolt Vasvari zvasv...@gmail.com wrote: You absolutely want to modify the LVL classes. Not modifing your class is an invitation for automated cracking of your app. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Re: LVL: possible to check license for a different app?
Thanks for your thoughts Brill. However, your solution is not very secure because it can be circumvented by anyone with root access. An attacker would just copy the paid app from a rooted phone and distribute it at will. At least if LVL is incorporated correctly into the code then the app must be cracked to disable the licensing check. On Jan 6, 8:58 pm, Brill Pappin br...@pappin.ca wrote: You miss my point. I'm saying don't depend on LVL for this feature. Sent from my Acer Android device Zsolt Vasvari zvasv...@gmail.com wrote: You absolutely want to modify the LVL classes. Not modifing your class is an invitation for automated cracking of your app. http://android-developers.blogspot.com/2010/09/securing-android-lvl-a... On Jan 6, 2:27 pm, Brill Pappin br...@pappin.ca wrote: I like that concept... it would certainly save me some hassle :) But, you maybe don't need to modify the LVL classes. All you really need is some way to check that they paid for something. Why not set up a content provider that contains the license details (you could actually do multiple levels of license then) and simply fail gracefully if the provider was not present? Another way would be to have the paid app write the license key to a shared preferences location when run. I agree that LVL should be able to do all this, but I think Google is simply not interested in improving LVL to work *with* the market. I'd be interested in developing a solution as well. What I was looking for was paid levels of license (all LVL would really need to do is return a licensing level instead of a boolean). - Brill Pappin On Jan 5, 7:27 pm, andfan22 andfa...@gmail.com 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 ...- Hide quoted text - - Show quoted text - -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Re: LVL: possible to check license for a different app?
No, you don't remove LVL so its still used to check the market. BTW - I'm not sure I completely agree with Zsolt on the modification. Fine to modify the library a little, but a non security/encryption expert is likely to make easy holes in such a library, particularly messing with the algorithms. The fact is that a determined cracker is going to get at your app no matter what you do. No, the idea is simply to use the LVL in the normal way, but communicate with the paid version in another way. Changes to LVL won't break it ether. - Brill Pappin -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Re: LVL: possible to check license for a different app?
Interesting idea, but I do not believe that the Market will let you publish a free app which asks for CHECK_LICENSE permissions, so I don't think that your free app will not be allowed to use LVL. On Jan 6, 7:41 am, Brill Pappin br...@pappin.ca wrote: No, you don't remove LVL so its still used to check the market. BTW - I'm not sure I completely agree with Zsolt on the modification. Fine to modify the library a little, but a non security/encryption expert is likely to make easy holes in such a library, particularly messing with the algorithms. The fact is that a determined cracker is going to get at your app no matter what you do. No, the idea is simply to use the LVL in the normal way, but communicate with the paid version in another way. Changes to LVL won't break it ether. - Brill Pappin -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
Re: [android-developers] Re: LVL: possible to check license for a different app?
I'm not positive about this, but I think LVL actually does allow free apps, and it always return true (free apps are always licensed). - Brill Pappin On 2011-01-06, at 12:26 PM, John Gaby jg...@gabysoft.com wrote: Interesting idea, but I do not believe that the Market will let you publish a free app which asks for CHECK_LICENSE permissions, so I don't think that your free app will not be allowed to use LVL. On Jan 6, 7:41 am, Brill Pappin br...@pappin.ca wrote: No, you don't remove LVL so its still used to check the market. BTW - I'm not sure I completely agree with Zsolt on the modification. Fine to modify the library a little, but a non security/encryption expert is likely to make easy holes in such a library, particularly messing with the algorithms. The fact is that a determined cracker is going to get at your app no matter what you do. No, the idea is simply to use the LVL in the normal way, but communicate with the paid version in another way. Changes to LVL won't break it ether. - Brill Pappin -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Re: LVL: possible to check license for a different app?
I'm developing an app which I'm considering publishing using a free + pro license model. I'm going to pass on some good advice I got from here. Don't do it. The users don't understand the free + license model. As amazing as this sounds, there will be people who buy your paid app before installing the free version. And there will be people who uninstall your free version, since they are about to buy the paid version. Both of them will wonder why they paid for a Pro version and it doesn't show up - or do anything. They'll be asking you about this, or hitting the refund button. Meanwhile, the others will complain that there are two icons once they've installed the license. To be nice, you'll take away the extra icon, and the first group will be even more mystified. I did the free + license app model. I switched over to demo and paid. I did this just in time. With the 15 minute refund period, I would be getting gobs of refunds. It's more of a pain for you to build and update two products, and a bit of a pain to transfer preferences. But it makes more sense for the users, and is less of a pain then trying to explain it. Nathan -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
Re: [android-developers] Re: LVL: possible to check license for a different app?
Hmm... this gives me an idea.
in one of my apps I require the Barcode Scanner app.
It has a built in request that the user install a dependency.
example from Barcode Scanner:
AlertDialog dialog = IntentIntegrator
.initiateScan(YOURLOCALCONTEXT);
if (dialog != null) {
Log.d(TAG, The user was asked
to install Barcode Scanner app.);
}
you might be able to use that kind of feature for this, so that if they install
the paid version first, it automatically prompts them to download the main
component.
It would work the other way as well. if a user tries to use a feature that is
only available for the paid version, they are prompted to install the
licensing app.
It's fairly easy to build an app that doesn't have a launcher icon, i.e. a
content provider or service...
However I've found with my IME that if the user doesn't see a launcher icon,
they get upset.
So i added a launcher icon for my IME that simply has instructions and support
contacts and I've got a lot less uninstalls and negative ratings... a
noticeable amount. I still do get a few who don't read even the main marketing
material but there is not much i can do about ID10T errors.
- Brill Pappin
On 2011-01-06, at 1:31 PM, Nathan wrote:
I'm developing an app which I'm
considering publishing using a free + pro license model.
I'm going to pass on some good advice I got from here.
Don't do it. The users don't understand the free + license model.
As amazing as this sounds, there will be people who buy your paid app
before installing the free version. And there will be people who
uninstall your free version, since they are about to buy the paid
version.
Both of them will wonder why they paid for a Pro version and it
doesn't show up - or do anything. They'll be asking you about this, or
hitting the refund button.
Meanwhile, the others will complain that there are two icons once
they've installed the license. To be nice, you'll take away the extra
icon, and the first group will be even more mystified.
I did the free + license app model. I switched over to demo and paid.
I did this just in time. With the 15 minute refund period, I would be
getting gobs of refunds.
It's more of a pain for you to build and update two products, and a
bit of a pain to transfer preferences. But it makes more sense for the
users, and is less of a pain then trying to explain it.
Nathan
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[android-developers] Re: LVL: possible to check license for a different app?
BTW - I'm not sure I completely agree with Zsolt on the modification. So you don't agree with Google on the modification? It's not coming from me, it's coming from Google. I showed you the link. Obviously, you wouldn't change the algorithm, just how the code is integrated/organized. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
Re: [android-developers] Re: LVL: possible to check license for a different app?
No, I don't automatically agree with what I'm told simply because I'm told it, Google or not :) more of us need to think for ourselves if your asking my opinion. However it's obvious what they are suggesting and why. It might even work to a degree, though I think it would be of limited help because there are at least two (likely more) bottlenecks where the system could be spoofed. The fact is that if someone wants to get at your code, they will. No system of this nature can be perfectly secure. Goodness knows Apple has tried with the iPhone and they are in a much better position to do it if it was possible. That doesn't mean we should not try to secure our work, just that we need to include breakage (if I might borrow a term from retail and manufacture) in our estimates. - Brill Pappin On 2011-01-06, at 7:04 PM, Zsolt Vasvari zvasv...@gmail.com wrote: BTW - I'm not sure I completely agree with Zsolt on the modification. So you don't agree with Google on the modification? It's not coming from me, it's coming from Google. I showed you the link. Obviously, you wouldn't change the algorithm, just how the code is integrated/organized. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Re: LVL: possible to check license for a different app?
I like that concept... it would certainly save me some hassle :) But, you maybe don't need to modify the LVL classes. All you really need is some way to check that they paid for something. Why not set up a content provider that contains the license details (you could actually do multiple levels of license then) and simply fail gracefully if the provider was not present? Another way would be to have the paid app write the license key to a shared preferences location when run. I agree that LVL should be able to do all this, but I think Google is simply not interested in improving LVL to work *with* the market. I'd be interested in developing a solution as well. What I was looking for was paid levels of license (all LVL would really need to do is return a licensing level instead of a boolean). - Brill Pappin On Jan 5, 7:27 pm, andfan22 andfa...@gmail.com 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 ... -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Re: LVL: possible to check license for a different app?
You absolutely want to modify the LVL classes. Not modifing your class is an invitation for automated cracking of your app. http://android-developers.blogspot.com/2010/09/securing-android-lvl-applications.html On Jan 6, 2:27 pm, Brill Pappin br...@pappin.ca wrote: I like that concept... it would certainly save me some hassle :) But, you maybe don't need to modify the LVL classes. All you really need is some way to check that they paid for something. Why not set up a content provider that contains the license details (you could actually do multiple levels of license then) and simply fail gracefully if the provider was not present? Another way would be to have the paid app write the license key to a shared preferences location when run. I agree that LVL should be able to do all this, but I think Google is simply not interested in improving LVL to work *with* the market. I'd be interested in developing a solution as well. What I was looking for was paid levels of license (all LVL would really need to do is return a licensing level instead of a boolean). - Brill Pappin On Jan 5, 7:27 pm, andfan22 andfa...@gmail.com 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 ...- Hide quoted text - - Show quoted text - -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
Re: [android-developers] Re: LVL: possible to check license for a different app?
You miss my point. I'm saying don't depend on LVL for this feature. Sent from my Acer Android device Zsolt Vasvari zvasv...@gmail.com wrote: You absolutely want to modify the LVL classes. Not modifing your class is an invitation for automated cracking of your app. http://android-developers.blogspot.com/2010/09/securing-android-lvl-applications.html On Jan 6, 2:27 pm, Brill Pappin br...@pappin.ca wrote: I like that concept... it would certainly save me some hassle :) But, you maybe don't need to modify the LVL classes. All you really need is some way to check that they paid for something. Why not set up a content provider that contains the license details (you could actually do multiple levels of license then) and simply fail gracefully if the provider was not present? Another way would be to have the paid app write the license key to a shared preferences location when run. I agree that LVL should be able to do all this, but I think Google is simply not interested in improving LVL to work *with* the market. I'd be interested in developing a solution as well. What I was looking for was paid levels of license (all LVL would really need to do is return a licensing level instead of a boolean). - Brill Pappin On Jan 5, 7:27 pm, andfan22 andfa...@gmail.com 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 ...- Hide quoted text - - Show quoted text - -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
