"nanopb" (protobuf c) it can be used on android? - android

this is nanopb website https://code.google.com/p/nanopb/
i dont know nanopb it can be used on android and iOS?
thanks
Best Wish

You can use C language code in android and iOS. In android NDK is provided for native libraries.

Yes, it is possible.
However, if your main application is in Java, it is probably not very pleasant to use a Protocol Buffers library through NDK. It will require a lot of boilerplate code in marshalling the messages back and forth.
I would suggest using the Google's own Java protobuf library, in its "nano" configuration mode.

Related

Can I access Java APIs and Packages that are not in Android?

Not all Java Packages are part of Android but is there a way to gain access to them through some work around? Purely as an example javax.sound is one such class. Yes Android has classes to do the same thing but if we already had the working Java written, rewriting it all using Android APIs is not ideal.
Is there any way to use the Java API or do we have to use the Android API?
No, not all Java libraries have been ported to Android. You will need to use the Android-specific implementation, especially for things that deal with the hardware layer or require a specific technology stack, such as audio libraries.
Yep totally you can but it depending on which libs that you want to use for example you cant use databases drivers in your android apps, neither UI libs , but you can use gson for example

C++ File adding

Can anyone please tell me how to add a C++ file in to an android project? Is there any method to import classes other than java classes?
The answer is that, you can't really add a C++ file directly to a project, but you can compile it and load it into the code that runs in your process and interface to it using the JNI. This is a way to interface native code to Java. However, be aware that you can't really do that much with the JNI. Getting access to standard Android things like UI, Intents, service connections, etc.., these are all somewhat more difficult to use in native code. And you certainly can't take a UNIX app "off the shelf" and stick it on Android by using the JNI. this is a fairly good looking tutorial on the JNI with Android. However, like I said, using the JNI is not an excuse for learning java and the Android SDK. The main reasons people use native code are for utility code (like crypto stuff) and performance (for example, quite a few Android games use the NDK)..
You have to use android NDK. Just download it and refer from android official site.

C++ library for mobile application

I have my own C++ library with source code. It contains functions like this: CreateDvice, FillDevice, CloseDevice and etc. There is no dependency to any third-party libraries.
There is requirement to create application for mobile platform:
Blackberry
iPhone
Android
The application has to use logic provided by this library.
Is there chance to use existing library in mobile application or at least some of them?
Or does it require to re-implement library code for each platform?
For iOS (iPhone/iPad) you can directly compile your library and use it from a regular iOS app written in Objective-C++ and/or C++.
For Android you can directly compile your library using the NDK, then either write your app in Java and call your library via JNI, or write the whole app in C++ using the NDK.
I believe you are out of luck on Blackberry, for this platform you'll need to rewrite your library in Java, as neither apps or libs can be written in C++.
Edit: See my other answer for a completely different approach that may work for you.
Blackberry:
It's technically possible to have ASM on BlackBerry (or Android, iPhone, etc.) but 3rd-party developers are often not allowed (or not able in the case of BlackBerry) to do so.
iPhone:
Absolutely. You can statically link a C++ library. Of course it will have to be compiled with the right instruction set. There are a host of examples out there on how to do this. Translate - you will need the code.
Android:
Absolutely. There is a good book on this by Mark Murphy. Introductory material here:
http://www.androidguys.com/2009/10/14/android-beyond-java-part-one/
Your question is unclear. Do you need a cross-platform library/engine to create a mobile application?
If it is so, Cocos2D would be the best choice. Originally it's a game engine, but it is suitable for applications too. And it supports all the platforms written above.
Instead of compiling your C++ library on each target device that you intend to support, you could opt for creating a service that packs your library. You can install this library on a host you have control, then from each platform the only thing you need to do is invoke this service.
I'm not sure if this thing makes sense for the kind of library that you have, but this would be a way to maintain a single version of your library, and you'll have a guaranteed same behavior on all devices.
Good luck.
Android is not natively Java, it's natively C++. And iOS is also natively C++. So why not just leave the C++ code untouched and drop RIM's current platform (since they are switching to BBX which does support C++ as well).
For Blackberry you can use the C++/Qt Cascades; for iOS you can use C/C++ & Objective-C (a superset of C) and Android can use the C++ NDK. You can use Java on all platforms as long as the Java apps are standalone and the JRE is pre-packaged with the app (iOS). You can interface with C/C++ libs using JNI
If you want to use a Java library on all platforms, that would work.
Android and Blackberry are natively Java.
You can use a tool called XMLVM to cross-compile your Java library to Objective C for use on iOS.
http://xmlvm.org/overview/
It is not 100% perfect, but pretty darn close. We use it extensively to port common Java library code to iOS. Port the C++ library to Java and you are good to go.

Start programming to Android

I know there is a dedicated area for Android issues, BUT I just want to know if there's an option to program to Android in C or in Java, and what will be the best language to write apps for Android.
This info you can't find in the Android area...
Thanks !!
Android practically is java.
Just read some how to start tutorials and you will see theres not much difference to conventional java applications.
It is Java with some platform dependent features.
SDK:
http://developer.android.com/sdk/index.html
DevGuides:
http://developer.android.com/guide/index.html
The Android API is in Java. You can find the developer guide here.
For performance-critical code, you can use the Android NDK.
Android's comprehensive java SDK makes it a lot easier to write apps in Java. You should check out the getting started page on their developer site.
The best? Java.
You can also write in C/C++ with the NDK.
And you can also write with Python or, say, Scala, but is not easy at all.
Java is the best because the API is Java, so all the documentation is in Java. Equally important, Google's ADT plugin to program Android in Eclipse is super easy, so you are going to work with an IDE, no need to advanced text editors and so.
Android applications are java based. (although I heard new NDK support development of full application in C).
It is possible to develop some libraries in c/c++ and load them to your application using JNI, which is also a Java feature. Start from here: http://developer.android.com/index.html I know it seems to general, but the official site is a great place to start from.
You use Java to program Android. It says it in the documentation for development for Android.
You can also use the NDK but don't start with that.

JNI tech. on Android or Linux platform when development ,so?

I face a problem while developing a native C/C++ shared library for Android platform. As we all know that Android use Java language for the upper layer development. Now I have ported my Engine code using ASCII C/C++ to Android using its bionic library, yet when need to design the User Interface, I have to use the JNI to call my engine code.
As far as I know, that is the only choice. The problem is my engine own hundreds of export APIs. If I use the JNI tech. I need to wrap these APIs to a new shared library for use, which will cost a lot of time for development and testing.
Can somebody give some suggestions for this situation? I am not familiar with java or JNI tech by the way.
TIPS:
When I searched the internet, I found some open source for JNI generator such as JNative etc. Until now I do not know is it suitable for Android platform or not.
You can easily use SWIG www.swig.org which will generate the JNI bindings for you.
there is nothing android-specific in that operation, so it will work rather out-of-the-box.

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