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I took some methods (not all) from free open source desktop application under GPL. This application written in C++ language, I convert those methods from C++ into Java code and used them in my android application.
So, Should I open source my android application?
It's not a matter of should you -- you're legally obligated to open source it if you distribute it at all.
Agreed with what has been answered so far... you have to...
Now, if for some reason, you would prefer to not release the source code, include the copyright notice and be obligated under GPL, you would need to rewrite those functions from scratch as a "clean room implementation" (implement only from the specifications / description, without taking any "inspiration" from the original work). If you can do that and somehow prove in case there is a dispute that you did actually do it, then you are good to go.
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I want to use this github library to implement in-app purchases: https://github.com/anjlab/android-inapp-billing-v3
Is it possible he inserted some code to steal license keys or something?
Not all code on Github is safe. However, a library with 2000 stars is almost certainly not doing anything malicious. If it were, somebody else would have looked through the code by now and found the nefarious content.
Are all libraries from github safe?
No, not really. Like all software, they can have vulnerabilities.
Although GitHub has put in place measures to cub Vulnerabilities in libraries, some might still have.
The good thing about open source is you can always look through the source code yourself and if you spot any suspicious code, you can easily not integrate it in your app.
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First of all I'm focused on iOS but but I've done ~2 apps for android in Java and it was horrible. I can't explain it why. Was it Java or Android itself but I hate it so much that when now I have to write another app for Android so I'm looking every option for me. This is what I found:
Kotlin - people said this is "Swift for android" but I still stuck with Android libraries.
Silver - "you can use Swift to write code directly against the .NET, Java, Android and Cocoa APIs. And you can also share a lot of non-UI code between platforms." But at this moment I've trouble with download it.
What's your opinion in this matter?
Do you have any experience with those two solutions?
As far as I know, there is no way to write apps for iOS and directly port them to Android.
What you can do is develop the bulk of the app in C++, while having calls to the GUI through JNI java functions.
With that being said, Android isn't scary at all, just face it straight on and you can do it.
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I hired one guy to develop android/ios application for my site. I want it as native, but i want to check if the developer used phonegap to create this application. Can i identify that without checking the source code ?
Answer consists of looking at the source code but you don't need direct access to it.
You could find out by simply uncompressing the .apk or .ipa installation file for android or ios respectively (like you would any zip file). If it's a phonegap app you will find a /www/ folder with html/css/js files, one which should be named cordova.js or phonegap.js.
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I've recently started using groovy as an alternative to Java and I would like to develop Android apps in groovy. All the examples I have investigated seem to be quite old.
So I was wondering if it is possible to develop Android apps in groovy?
It's a great idea, and it's been tried with partial success - there was a project called DiscoBot that had things partially working - see http://skillsmatter.com/podcast/groovy-grails/groovy-android
However, it's a difficult proposition though, both because of the size of the Groovy runtime, and because much of what Groovy does to implement a dynamic language is not fully supported by the Dalvik VM.
That said, it is being worked on.
I'm guessing that the reason that you got some 'close' votes here is because you could have found all of this information for yourself with a quick search in your favorite web search engine.
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I want to use the source code of stock image editor present in ICS. where can I download it. please help some one. I am new to this field.
Thanks!
The ICS Image Editor is baked right into the Gallery app. You can find that here, where you can clone the GIT repository. The Camera source code is also available. You will find, however, that some aspects of these sources are run natively (in C) and the sources for this I do not believe are publicly available. (You may also find this question useful.)
Photo Studio is a third-party app that is closed-source and not stock.
There is a 3rd party Image Editor source code at Google Code. I do warn you: The code may not be as simple as you're hoping for. (PS: You may want to do some research next time... this was found with one Google search.)