Develop Reference

How to Start with Pjsip Video chat android application?

I have lot of search for tutorial and demo project but i can't find, any one please help me to start learning Pjsip with guidance and demo app source code thank you.

Did you check the official documentation? It literally states: We have a GUI sample application with video support. The project is located under pjsip-apps/src/vidgui. Read more here
I recently build the library for android without any issues, however it did not include the video support. Try and follow the provided steps so you can build their example project and use it as a starting point. Good luck!

How to open my Android native application with Xamarin.forms?

I've been developing an Android application with Android Studio and now I need to be able to open it with Xamarin.forms in Visual Studio (it's a task that my teacher gave me, and it's because a classmate has been creating the iOS version and now we will combine them into one project).
I have to say that I'm pretty much a noob and been looking a few tutorials that talk about Dependency Service and other stuff, but don't seem to quite cover what I'm looking for (or, at least, not clearly enough).
If you have a precise video that explains simply how to do this, I would be grateful if you share it with me.
I thank you for your time and wish you a great day :)

It is impossible at even now in current version of Visual Srudio .
Every file in Xamain is different with Native Android . The Java code can not be directly copyed to use in Xamarin , you should translate them to C#.
Having a look at this document: Porting Java to C# for Xamarin.Android .
There are two ways to port Java code to C#. The first way is to port the code manually. ..The second porting methodology is to try and automate the process by using a code converter...There is often a non-trivial amount of work involved with bootstrapping an automated code conversion tool, and this may prove to be a barrier to use. In many cases, it may be simpler and easier to port Java to C# by hand.

React-Native using Android Studio

Is it possible to run a React-Native project using only Android Studio. Right now I use Genymotion for emulator and Webstorm to make changes to source files. It would be great if I can use Android Studio for both running the emulator and making changes to files. I would really appreciate if someone can point me how to do it?

The short answer is "NO".
A better question would be:
Is it possible to write React like programs in Android Studio?
The answer is "Yes" but probably not in the way you are thinking. The main difference is Java, it works totally different then JavaScript. So you could make react like code in Java with RxAndroid (see how) but it will look different

android application dividing the project

I am working in a team to create an andorid application.Initially we worked on a particular single system for developing.
Problem is that we want to divide the work among all of the team members so that they can work on a particular section of the development in seperate systems.
But we dont know how to divide a project into different systems.Also we would like to know how to club these works together after completion to form the application.We are using eclpse for developing.
Please help us.We are having a great problem with this.
Please help us.

#user3285824 : You need a Revision Control or Source Control Tool. Please check out Apache Subversion which is the best tool to develop separate modules in eclipse with team members.
Follow the tutorial to install SVN in eclipse.

Use GIT repositories in a common server. There you can get your own copy of the project and you can modify your copy. Then you can update your changes in the server. Please refer to http://git-scm.com/book/en/Git-on-the-Server-Setting-Up-the-Server

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.