Kivy on Android

Kivy is a open source Python library for rapid development, runs on Linux, Windows, OS X, Android, iOS, and Raspberry Pi. You can run the same code on all supported platforms.

You can run Kivy applications on Android, on (more or less) any device with OpenGL ES 2.0 (Android 2.2 minimum). This is standard on modern devices; Google reports the requirement is met by 99.9% of devices.

Kivy APKs are normal Android apps that you can distribute like any other, including on stores like the Play store. They behave properly when paused or restarted, may utilise Android services and have access to most of the normal java API.

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Xamarin Cross-platform Application Development - Second Edition

Develop production-ready applications for iOS and Android using Xamarin

Xamarin Cross-platform Application Development - Second Edition
About This Book

• Write native iOS and Android applications with Xamarin.iOS and Xamarin.Android respectively
• Learn strategies that allow you to share code between iOS and Android
• Design user interfaces that can be shared across Android, iOS, and Windows Phone using Xamarin.Forms

Who This Book Is For
If you are a developer with experience in C# and are just getting into mobile development, this is the book for you. If you have experience with desktop applications or the Web, this book will give you a head start on cross-platform development.

In Detail
Developing a mobile application for just one platform is becoming a thing of the past. Companies expect their apps to be supported on both iOS and Android, while leveraging the best native features on both. Xamarin's tools help ease this problem by giving developers a single toolset to target both platforms.

This book is a step-by-step guide to building real-world applications for iOS and Android. The book walks you through building a chat application, complete with a backend web service and native features such as GPS location, camera, and push notifications. Additionally, you'll learn how to use external libraries with Xamarin and Xamarin.Forms to create shared user interfaces and make app-store-ready applications. This second edition has been updated with new screenshots and detailed steps to provide you with a holistic overview of the new features incorporated in Xamarin 3. By the end of the book, you will have gained expertise to build on the concepts learned and effectively develop a market-ready cross-platform application.

Visual C++ for Cross Platform Mobile Development using Visual Studio 2015

In this video, Ankit Asthana shows you how to use Visual Studio 2015 to share, reuse, build, deploy, and debug your cross-platform mobile C/C++ code, including how to: Create projects from templates for Android Native Activity apps, or for shared code libraries that you can use on multiple platforms and in Xamarin hybrid apps. Use platform-specific IntelliSense to explore APIs and generate correct code for Android or Windows targets. Configure your build for x86 or ARM native platforms. Deploy your code to attached Android devices or use Microsoft's performant Android emulator for testing. Set breakpoints, watch variables, view the stack and step through code in the Visual Studio debugger. Share all but the most platform-specific code across multiple app platforms, and build them all with a single solution in Visual Studio. 

Visual C++ for Cross Platform Mobile Development using Visual Studio 2015

Native Mobile Application Development for iOS, Android, and Windows in C# and Visual Studio Using Xamarin

Xamarin enables C# developers to become native iOS, Android, and Windows mobile developers overnight. In this session, learn how to leverage your existing skills, tools, and code to build mobile apps for all major device platforms. Using Xamarin, you can develop native iOS, Android, and Windows apps while sharing on average 75% of your code. This session also gives you the tools to assess your current code base, look at the architecture necessary to support maximum code sharing and reuse, and provide guidance and best practices for handling fragmentation across and within each device platform. To illustrate these points, we look at real-world example mobile apps and the architecture and patterns that power them.

For more information, check out this course on Microsoft Virtual Academy: Visual Studio.

Strategies for Developing Cross-Device Applications with Visual Studio 2013

This session will cover the strategic decisions developers have to make when targeting multiples devices in application. The video will explore the tools and technologies that available in Visual Studio 2013 for both web and native applications that target Windows, iOS and Android devices, as well as best practices to reuse code and skills across them.

source: http://channel9.msdn.com/Events/Build/2014/2-586