#Android

Background

In this blog, I will introduce how to use custom renderer to customize the back button icon and text in app’s navigation bar.

There is reason that why I have to log this blog. Let’s say, if you want to customize some control in Xamarin.Forms using custom render, usually you will do this: First, learn what is the native control that is wrapped in Xamarin.Forms, then you create a new class which inherits from that control’s class. After that, you will create a renderer class for that control in the platform-specific project which is Android, iOS or UWP. You will use the normal format how custom renderer does on that class and implement the OnElementChanged method for the customization logic, the OnElementChanged method was called when the control was generated. At the end, you will be able to use that new control in your XAML page file.

The official document of how to use custom renderer is here: Xamarin.Forms Custom Renderers

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It’s really important for engineers who use Xamarin to develop Android app to know how to transfer Java code to C# code.

Recently I am trying to implement something in Xamarin.Android project (Not Forms) and I encountered lots of issues.

What I can find online is mostly Android native documents from Google. And I do find one sample project from Google that is implemented in Android Studio using Java.

So what I have to do is to understand how to transfer Java code to C# code, otherwise you will find it quite difficult to use pure Xamarin.Android project.

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Background

One of the most common issues that we will meet when developing with Xamarin is that there are lots of the libraries exist in Android or iOS but not in .NET. It’s the same reason as WinPhone’s failure. There are lots of applications exist in Android and iOS but you cannot find in Microsoft Store.

To resolve this issue, Xamarin has a project type which is called Binding project. Using this, you will be able to binding a jar/aar package under Android or objective-C library under iOS in Xamarin project as a dll library. You can even import a native library written in C/C++ (but we will not cover in this article).

In this article, we will focus on how to bind a jar package in Xamarin. Aar package is the same actually only with some resouces packaged in that library.

Content

There are 2 aspects in this article. First is that I will reference an article written by MS senior developer for Xamarin, these are the concepts on how to do the troubleshooting. The second aspect is what I have done while dealing with Xamarin.Android binding project and how I used the knowledge in the first aspect.

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