Скачать или смотреть How to Make NavHostFragment and ViewPager2 Work Together in Your Android App

Discover how to seamlessly integrate `NavHostFragment` and `ViewPager2` in your Android application without sacrificing functionality.
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This video is based on the question https://stackoverflow.com/q/74181134/ asked by the user 'asdwq' ( https://stackoverflow.com/u/19309232/ ) and on the answer https://stackoverflow.com/a/74181354/ provided by the user 'TheLibrarian' ( https://stackoverflow.com/u/3434763/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

Creating mobile applications often involves navigating between different screens or fragments. When using Android's Navigation Component alongside ViewPager2, developers may encounter a frustrating issue: both elements often don't work together seamlessly. If you're facing the challenge of wanting to swipe between fragments while still being able to navigate to another fragment directly, this post is for you. Let’s delve into the solution step by step.

Understanding the Issue

When you set up your layout to include both a NavHostFragment and a ViewPager2, you might initially expect to be able to swipe through fragments and navigate to a separate fragment. However, placing a FragmentContainerView and a ViewPager2 in the same layout can lead to conflicts in user interactions:

If FragmentContainerView is on top of ViewPager2, you can navigate between fragments, but lose the ability to swipe.

Conversely, if you switch their order, you can swipe but cannot navigate directly to a specific fragment.

A Proper Solution

The good news is that both NavHostFragment and ViewPager2 can exist together, but they need to be structured correctly in your application.

1. Setting up the Fragments

Instead of trying to make ViewPager2 and NavHostFragment work simultaneously in a single layout, you'll need to create a dedicated fragment that will handle the ViewPager2. Here's how you can set it up:

a. Create a Wrapper Fragment

FragmentA: This fragment will contain your ViewPager2. It will serve as the container for all your swiping fragments, say Fragment1, Fragment2, and Fragment3.

b. Layout for FragmentA

In FragmentA, you'll implement the ViewPager2 where all the swiping actions will occur:

[[See Video to Reveal this Text or Code Snippet]]

c. Swift Navigation

When you want to navigate to another fragment (let's say FragmentB), you can make use of the Navigation Component to go from FragmentA (which holds your ViewPager2) to FragmentB.

2. Implementation Steps

a. Setup the Navigation Graph

Ensure your navigation graph is correctly configured to handle transitions from FragmentA to FragmentB.

b. Integrate ViewPager2 Adapter

In FragmentA, set up the adapter for ViewPager2 that manages Fragment1, Fragment2, and Fragment3.

c. Code Example

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By setting up a dedicated fragment for your ViewPager2, you maintain the ability to swipe between fragments without losing the functionality provided by the Navigation Component. This structured approach enables a more organized navigation flow within your Android application, enhancing overall user experience.

Now, go ahead and reorganize your app's layout while leveraging the strengths of both NavHostFragment and ViewPager2 together! Happy coding!