Home
Feed

Extend

Hashnode Pro
Hashnode for Agents

Resources

The foreword
Hashnode gql skill

Buildful - AI coding agent that delivers frontier-level results at a fraction of the cost Bug0 - The AI-native e2e QA regression testing Hackathons Changelog Brand @hashnode on X Hashnode on LinkedIn Support - hello+support@hashnode.com Code of Conduct Terms Privacy Sitemap

Search Hashnode

Search posts, tags, users, and pages

Feed/

Discussion

Using an Activity from a Hilt ViewModel

👋 Hi, this is P.Y., I work as an Android Engineer at Block. This blog shares a bit of hackery to be able to access an activity instance within a Hilt ViewModel. If you come up with other interesting

Sep 7, 2022·5 min read·blog.p-y.wtfUpdated Mar 26Read the article

#android
#dagger-hilt

#dependency-injection

#viewmodel

Written by

Pierre-Yves Ricau

@py · San Francisco

View profile

Deep dives

My pronouns are he / him. Android Engineer at Square / Block. A few things I enjoy: Publishing Open Source libraries (LeakCanary, Curtains, Radiography, square/logcat) Rollerblading Writing technical blogs (previously on dev.to/pyricau) Cooking Giving tech talks Reading sci-fi

Responses2

Markdown supported · ⌘↵ to post

Eugen Martynov

Sep 12, 2022

My first thought was that the provider would implement the activity lifecycle callback. So I would just have one line to register it.

However, when you have multiple of them, maybe this is better so you can control the order of the calls or what is the intent?

Pierre-Yves Ricau

Sep 12, 2022

Yeah the general idea here is that this ensures you add an activity to a specific activity stack, rather than starting it from a random live activity or from the application context which isn't tied to a specific activity stack.

florent guillemot

Sep 12, 2022

Hi Py,

I don't get your blog post to start an activity you don't have to have an activity right? a context is enough as it is possible to call context.startActivity

Thanks, Flo

Eugen Martynov

Unfortunately, context is enough in limited cases.

Sep 12, 2022

Pierre-Yves Ricau

Sep 12, 2022

Starting an activity from the Application class isn't the same as starting it from an activity. When using the application class the activity manager doesn't know which activity stack the new activity should be added to.