Navigation in Modular Applications with Deep Linking

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Navigation in Modular Applications Damian Burke Onefootball @damian2048 damian-burke

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Modularization

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Single Module app Easy access to everything. Scoping with modiﬁers (public, private, protected, …) and packages.

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Modularization by Layer app domain data ... Layers work on a need-to-know basis. Easy to build for different targets (mobile, wearOS, TV).

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Modularization by Feature app dashboard newsfeed profile core Feature scopes allow parallel work with less conﬂicts.

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Modularization Matrix app dashboard-ui core dashboard-domain dashboard-data newsfeed-ui dashboard-domain dashboard-data profile-ui profile-domain profile-data

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Navigation

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Multi-Activity and Intent

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Fragment Transactions

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View Groups and Views Or use one of the view-based frameworks like… - Conductor - Scoop

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AndroidX Navigation Component

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Deep Linking

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How to Link URI - Uniform Resource Identiﬁer URI Scheme: RFC 3986

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Surﬁng the web… Platform independent.

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Deep Linking

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Deep Linking Scheme: myapp Host: profile Path: 12345

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Deep Linking in Action

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Manually via Android Manifest

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Deeplink Processor Single Activity to catch-all deeplinks.

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Deeplink Processor Single Activity to catch-all deeplinks.

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Deeplink Processor Single Activity to catch-all deeplinks. Passes the link on to a handler.

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Deeplink Processor Single Activity to catch-all deeplinks. Passes the link on to a processor.

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Annotation-based Deeplink Processor https://github.com/airbnb/DeepLinkDispatch

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Annotation-based Deeplink Processor https://github.com/airbnb/DeepLinkDispatch

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AndroidX Navigation Component

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Modularization + Navigation

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Modularization by Feature app dashboard profile core All possible targets can be made available by adding the dependency. newsfeed

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Modularization by Feature… with Dynamic Delivery app dashboard profile core Sometimes the newsfeed module is there, sometimes it’s not. newsfeed

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Detour: Dynamic Features app dashboard profile core Google introduced Dynamic Features to further modularize app delivery. Next step after App Bundles. Reverses the module-dependency. newsfeed (injecting functionality)

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Detour: Dynamic Features app dashboard profile core App has no compile-time dependency on newsfeed. App (or base) doesn’t know about Android components. newsfeed (injecting functionality)

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Multi-Activity and Intent Now requires a String instead of the class name.

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Fragment Transactions Now require reﬂection to create the Fragment instead of a simple constructor or method call.

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Modularization + Deep Linking

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Modularization: The tough part with dynamic features Dynamic features are/can be added at runtime. Requires a dynamic navigation. Implementation details might be unknown. app dashboard profile core newsfeed ? ?

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Modularization: The tough part with dynamic features We could use fully qualiﬁed class names and create Intents, but that introduces tight coupling between otherwise independent dynamic features. app dashboard profile core newsfeed ?

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Modularization: The tough part with dynamic features Fully qualiﬁed class names as Strings… just doesn’t feel right. dashboard newsfeed

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Deep Linking Implementation independent. Descriptive.

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Modularization: The tough part with dynamic features Deep Linking through via Intents as a decoupled navigation pattern. Good for a decoupled scenario. app dashboard profile core newsfeed intent: myapp://newsfeed/article/123

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Modularization: The tough part with dynamic features AndroidManifest is still merged. Intent-Filters are alive in dynamic features. Flexible and dynamic. app dashboard profile core newsfeed intent: myapp://newsfeed/article/123 intent-ﬁlter: myapp://newsfeed/{type}/{id}

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What’s next?

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Modularization is hard. Take a look at other approaches. Navigation in Modular Applications with Deep Linking - https://blog.usejournal.com/navigation-in-modular-applicatio ns-with-deep-linking-6a599c11e487 Patterns for accessing code from dynamic feature modules - https://medium.com/androiddevelopers/patterns-for-accessi ng-code-from-dynamic-feature-modules-7e5dca6f9123 Plaid - https://github.com/android/plaid airbnb Deeplink Dispatcher - https://github.com/airbnb/DeepLinkDispatch AndroidX Navigation - https://developer.android.com/guide/navigation/

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Thank You Onefootball @damian2048 damian-burke (we’re hiring)