Android Navigation Arch Component — A Curious Investigation

Android Navigation Arch Component — A Curious Investigation

On the last Google IO, JetPack was announced - a series of libraries to help Android development and boost it. These libraries are fully developing these essential parts of the application. Necessary parts mean things like handling configuration, holding data still, carrying out operations in the background and so on.

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Some of these libraries were announced by Google OJ 2017, and are now releasing fairly, and some are completely new. Navigation is one of the new libraries.

What is Navigation

The shipping component is a new architectural component designed to simplify the application of navigation in an application. At the beginning, it is important to mention that the shipping component is scope to one Activity. It means the idea that individual activity with different fractions would be used to navigate through different parts of the application. Therefore, there would be a Activity Navigation component (if possible, in the application). Then, one of the fragments of this Activity could be focused on another Activity, which would have to define its own Navigation range. Now this is a little difficult because of the problems identified with the fragments and the fragments manager, but the good news is that this Navigation component is there to do these things for us. Thus self-management is undertaken.

Why navigation

This is one of the first questions that comes to mind when you are thinking about the Shipping component. As mentioned earlier, there was an identified problem with the fragments and many developers wanted to use fragments, or at least work with the Divisional Manager to avoid it. Turns out, the need for such a component sets the fact that the activities have some limitations too.

Many, Ian Lake's arguments in this tweet are more than enough to think about making a stronger and easier to use solution. Not only does the navigation component help solve those problems mentioned by Ian Lake in this tweet, but it offers some fantastic features such as running safe arguments, default arguments, handling deep links, automatic setup with side-navigationView and with BottomNavigationView. In addition, there is also a visual editor in which all these items can be put together, and the developers can give an overview of what goes around and understand and manage the structure more easily. We will look closer.

Getting Started

I would highly recommend the official guidance for the new Navigation component, as well as its documentation to proceed with implementation.

Apply navigation with Architectural Navigation Component. \ T Android Developers

The Architectural Shipping Component makes the implementation of shipping simplified between destinations in your app. A…

developer.android.com

I have created a simple play project where I wanted different things with the Navigation component. Remember that I'm using the latest version of Android Studio from the Canary Channel.

mitrejcevski playground / jetpack

pipette playground - Playground to learn new things JetPack

github.com

At first, we declare that the component of Navigation is dependent in our construction file, and info:

enforcement 'android.arch.navigation: shipping-il-ktx: 1.0.0-alpha01'

'android.arch.navigation: navigation-ui-ktx: 1.0.0-alpha01'

Define Navigation Graph

To start the shipping component, we first define the navigation graph. The shipping graph contains only an XML file being placed in the navigation folder in the resources. With right click on the re folder, we select New Resources File -> Android

Add new resource file

Then, in the New Resource File window, we specify a name for the file, and then choose Navigation as a Resource type

Define a new navigation graphics resource file

Once it's done, the newly defined navigation graph is open to the studio navigation editor. By using the latest Android Studio, we can see this XML file in a design preview as well as to edit the XML as text. The same thing we could do with the layout files. The shipping editor provides the ability to wire things and configure the navigation in the desired way.

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