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@MOLSJEROEN SUCCESSFULLY MODULARIZING APPS

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@MOLSJEROEN @MOLSJEROEN @MOLSJEROEN

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@MOLSJEROEN WHY MODULARIZATION ARCHITECTURE HOW TO APPROACH LESSONS LEARNED

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WHY

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@MOLSJEROEN 1. SPEED UP BUILDS Gradle does two things to speed up builds • Avoid work/caching • Parallellization Need smaller items of work

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@MOLSJEROEN 1. SPEED UP BUILDS: SMALLER ITEMS OF WORK

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@MOLSJEROEN 1. SPEED UP BUILDS: SINGLE MODULE

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@MOLSJEROEN 1. SPEED UP BUILDS: MULTI MODULE

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@MOLSJEROEN 1. SPEED UP BUILDS: MULTI MODULE

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@MOLSJEROEN 2. ALLOW ON DEMAND DELIVERY

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@MOLSJEROEN 2. ALLOW ON DEMAND DELIVERY At-install delivery On demand delivery Conditional delivery Instant delivery Need to split up app Support future requirements

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@MOLSJEROEN 3. SIMPLIFY DEVELOPMENT APP

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@MOLSJEROEN 3. SIMPLIFY DEVELOPMENT APP FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6

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IT’S EASIER TO BUILD SEVERAL SMALL THINGS THAN TO BUILD ONE BIG THING Unknown

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@MOLSJEROEN 3. SIMPLIFY DEVELOPMENT Clear contracts between modules • Less spaghetti code • Fewer cascading changes • Easier in-module refactoring Easy to understand code Cheaper maintenance

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@MOLSJEROEN 4. REUSE MODULES

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@MOLSJEROEN 4. REUSE MODULES: MULTIPLE APPS APP 1 FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6 LIBRARY 1 LIBRARY 2 APP 2

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@MOLSJEROEN APP 1 FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6 LIBRARY 1 LIBRARY 2 APP 2 4. REUSE MODULES: MULTIPLE APPS

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@MOLSJEROEN APP 1 FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6 LIBRARY 1 LIBRARY 2 APP 2 FEATURE X FEATURE X 4. REUSE MODULES: MULTIPLE APPS

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@MOLSJEROEN APP 1 FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6 LIBRARY 1 LIBRARY 2 APP 2 FEATURE X FEATURE X 4. REUSE MODULES: MULTIPLE APPS

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@MOLSJEROEN APP 1 FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6 SDK LIBRARY 2 4. REUSE MODULES: SDK

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@MOLSJEROEN APP 1 FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6 SDK LIBRARY 2 4. REUSE MODULES: SDK

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@MOLSJEROEN APP 1 EXPOSED FEATURE WITH INTENT FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6 LIBRARY 1 LIBRARY 2 4. REUSE MODULES: EXPOSE FEATURES

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@MOLSJEROEN APP 1 EXPOSED FEATURE WITH INTENT FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6 LIBRARY 1 LIBRARY 2 4. REUSE MODULES: EXPOSE FEATURES

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@MOLSJEROEN APP 1 FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6 AWESOME GITHUB LIBRARY LIBRARY 2 4. REUSE MODULES: OPEN SOURCE

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@MOLSJEROEN APP 1 FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6 AWESOME GITHUB LIBRARY LIBRARY 2 4. REUSE MODULES: OPEN SOURCE

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@MOLSJEROEN 5. EXPERIMENT WITH NEW TECHNOLOGIES Rapidly evolving Android landscape Need to experiment rapidly Cost of wrong technology choice Avoid technology lock-in

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@MOLSJEROEN Source: https://blog.daftcode.pl/hype-driven-development-3469fc2e9b22

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@MOLSJEROEN 5. EXPERIMENT WITH NEW TECHNOLOGIES APP FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6

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@MOLSJEROEN 6. SCALING Large teams cause new issues • Merge conflicts • Dependencies • Code ownership

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@MOLSJEROEN 6. SCALING: DEVELOP IN PARALLEL Team A Team B APP FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6

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@MOLSJEROEN 6. SCALING: DEVELOP IN PARALLEL Team A Team B APP FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6

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@MOLSJEROEN 6. SCALING: OUTSOURCE Team A External company APP FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6

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@MOLSJEROEN 7. IMPROVE LEGACY CODE

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@MOLSJEROEN Aggressive High impact Lot of work Not value focussed Risky launch Exciting Less risky Gradual Slow Tedious Continuous releases Unsatisfying REWRITE REFACTOR V S

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@MOLSJEROEN Aggressive High impact Lot of work Not value focussed Risky launch Exciting Less risky Gradual Slow Tedious Continuous releases Unsatisfying REWRITE REFACTOR V S

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@MOLSJEROEN 7. IMPROVE LEGACY CODE: REWRITE, REFACTOR OR ACCEPT APP FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6

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@MOLSJEROEN 7. IMPROVE LEGACY CODE: REWRITE, REFACTOR OR ACCEPT APP FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6

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@MOLSJEROEN 7. IMPROVE LEGACY CODE Able to rewrite parts of code base Keep ability to release Gradually roll out possible Faster time to market

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@MOLSJEROEN 8. SIMPLIFY TEST AUTOMATION

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@MOLSJEROEN 8. SIMPLIFY TEST AUTOMATION

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@MOLSJEROEN 8. SIMPLIFY TEST AUTOMATION Speeds up tests Simplified test setup Higher test reliability

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@MOLSJEROEN WHY: RECAP Speed up builds Allow on demand delivery Simplify development Reuse modules across apps Experiment with new technologies Scale development team Improve legacy code Simplify test automation

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MODULARIZATION ARCHITECTURE

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YOU HAVE YOUR WAY. I HAVE MY WAY. THE RIGHT WAY, THE CORRECT WAY, AND THE ONLY WAY DOES NOT EXIST. F. Nietzsche

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@MOLSJEROEN APP STRUCTURE

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@MOLSJEROEN APP STRUCTURE

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@MOLSJEROEN APP STRUCTURE

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@MOLSJEROEN APP STRUCTURE

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FEATURES ARE A FLOW OF SCREENS

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@MOLSJEROEN APP WIREFRAME

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@MOLSJEROEN APP WIREFRAME

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@MOLSJEROEN APP WIREFRAME

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APPS CONSIST OF SEVERAL FEATURES

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@MOLSJEROEN ANDROID APP COMPONENTS ACTIVITY SERVICE BROADCAST RECEIVER CONTENT PROVIDER

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@MOLSJEROEN ANDROID APP COMPONENTS Full screen UI Reuse across apps Started via explicit or implicit intents ACTIVITY SERVICE BROADCAST RECEIVER CONTENT PROVIDER

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@MOLSJEROEN IMPLICIT INTENTS

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ANDROID LINKS MULTIPLE APPS TOGETHER VIA IMPLICIT INTENTS

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@MOLSJEROEN MODULARIZED ARCHITECTURE APP

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@MOLSJEROEN MODULARIZED ARCHITECTURE APP FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6

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@MOLSJEROEN MODULARIZED ARCHITECTURE APP FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6 LIBRARY 4 LIBRARY 4 LIB 1 LIBRARY 2 LIBRARY 3

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@MOLSJEROEN FEATURE MODULES Full screen, coherent user facing functionality in the app Android library module Single activity with (optional) navigation graph Respond to implicit intents and pass back a result Never depend on other features or app Depend on several library modules APP FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6 LIBRARY 4 LIBRARY 4 LIB 1 LIBRARY 2 LIBRARY 3

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@MOLSJEROEN LIBRARY MODULES Plumbing that is reused across several or all features Android library, pure Java or pure Kotlin module Never depend on features or app Can (but don’t have to) depend on other libraries APP FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6 LIBRARY 4 LIBRARY 4 LIB 1 LIBRARY 2 LIBRARY 3

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@MOLSJEROEN APP MODULE Links feature modules together in a useful app Android application module Depends on other features and libraries Orchestrates navigation between features Decides what features are enabled using feature toggles Doesn’t contain much code APP FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6 LIBRARY 4 LIBRARY 4 LIB 1 LIBRARY 2 LIBRARY 3

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@MOLSJEROEN ADVANTAGES Application structure Navigation Testing Scaling Feature flagging Experiment with new technology

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@MOLSJEROEN APPLICATION STRUCTURE

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@MOLSJEROEN DASHBOARD FEATURE

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@MOLSJEROEN DASHBOARD ACTIVITY

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@MOLSJEROEN LOGIN FEATURE

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@MOLSJEROEN SHARING FEATURE

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@MOLSJEROEN NAVIGATION Split navigation in smaller parts • Within a feature -> handled by the feature • Between features -> handled by the app module APP FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6

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@MOLSJEROEN NAVIGATION: IN FEATURE Android Navigation components • Visualize navigation flow • Find back screens • Easy code browsing

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@MOLSJEROEN NAVIGATION: IN FEATURE

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@MOLSJEROEN NAVIGATION: IN FEATURE

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@MOLSJEROEN NAVIGATION: IN FEATURE

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@MOLSJEROEN NAVIGATION: IN FEATURE

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@MOLSJEROEN NAVIGATION: IN FEATURE

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@MOLSJEROEN NAVIGATION: IN FEATURE

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@MOLSJEROEN NAVIGATION: IN FEATURE

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@MOLSJEROEN NAVIGATION: IN FEATURE

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@MOLSJEROEN findNavController().navigate(R.id.action_welcomeFragment_to_loginFragment) NAVIGATION: IN FEATURE

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@MOLSJEROEN NAVIGATION: IN FEATURE

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@MOLSJEROEN NAVIGATION: BETWEEN FEATURES startActivity(Intent(activity, DashboardActivity::class.java))

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@MOLSJEROEN NAVIGATION: BETWEEN FEATURES startActivity(Intent("action.dashboard.open"))

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@MOLSJEROEN NAVIGATION: BETWEEN FEATURES

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@MOLSJEROEN NAVIGATION: BETWEEN FEATURES

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@MOLSJEROEN NAVIGATION: BETWEEN FEATURES String duplication of action In depth knowledge of intent creation Other apps could also handle action

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@MOLSJEROEN NAVIGATION: BETWEEN FEATURES APP FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6 ACTIONS LIBRARY 4 LIB 1 LIBRARY 2 LIBRARY 3

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@MOLSJEROEN NAVIGATION: BETWEEN FEATURES object Actions { fun openLoginIntent() = Intent("action.login.open") fun openDashboardIntent() = Intent("action.dashboard.open") fun openSharingIntent() = Intent("action.sharing.open") } activity.startActivity(Actions.openDashboardIntent())

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@MOLSJEROEN NAVIGATION: BETWEEN FEATURES object Actions { fun openLoginIntent() = Intent("action.login.open") fun openDashboardIntent() = Intent("action.dashboard.open") fun openSharingIntent() = Intent("action.sharing.open") } activity.startActivity(Actions.openDashboardIntent())

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@MOLSJEROEN NAVIGATION: BETWEEN FEATURES object Actions { fun openDashboardIntent(userId: String) = Intent(context, "action.dashboard.open") .putExtra(EXTRA_USER, UserArgs(userId)) } activity.startActivity(Actions.openDashboardIntent("userId"))

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@MOLSJEROEN NAVIGATION: BETWEEN FEATURES object Actions { fun openDashboardIntent(userId: String) = Intent(context, "action.dashboard.open") .putExtra(EXTRA_USER, UserArgs(userId)) } activity.startActivity(Actions.openDashboardIntent("userId"))

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@MOLSJEROEN NAVIGATION: BETWEEN FEATURES

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@MOLSJEROEN NAVIGATION: BETWEEN FEATURES object Actions { fun openLoginIntent(context: Context) = internalIntent(context, "action.login.open") private fun internalIntent(context: Context, action: String) = Intent(action).setPackage(context.packageName) }

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@MOLSJEROEN NAVIGATION: BETWEEN FEATURES object Actions { fun openLoginIntent(context: Context) = internalIntent(context, "action.login.open") private fun internalIntent(context: Context, action: String) = Intent(action).setPackage(context.packageName) }

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@MOLSJEROEN NAVIGATION: BETWEEN FEATURES Implicit intents Actions module Abstract away feature parameters Restrict to current package

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@MOLSJEROEN TESTING UNIT INTEGRATION E2E

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@MOLSJEROEN TESTING APP FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6 LIBRARY 4 LIBRARY 4 LIB 1 LIBRARY 2 LIBRARY 3

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@MOLSJEROEN FEATURE TESTING class LoginFlowTest { @Rule @JvmField var mActivityTestRule = ActivityTestRule(LoginActivity::class.java) @Test fun loginFlowTest() { onView(withId(R.id.button_login_start)).perform(click()) onView(withId(R.id.button_login_signin)).perform(click()) onView(withId(R.id.button_login_toapp)).check(matches(isDisplayed())) } }

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@MOLSJEROEN FEATURE TESTING class LoginFlowTest { @Rule @JvmField var mActivityTestRule = ActivityTestRule(LoginActivity::class.java) @Test fun loginFlowTest() { onView(withId(R.id.button_login_start)).perform(click()) onView(withId(R.id.button_login_signin)).perform(click()) onView(withId(R.id.button_login_toapp)).check(matches(isDisplayed())) } }

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@MOLSJEROEN FEATURE TESTING class LoginFlowTest { @Rule @JvmField var mActivityTestRule = ActivityTestRule(LoginActivity::class.java) @Test fun loginFlowTest() { onView(withId(R.id.button_login_start)).perform(click()) onView(withId(R.id.button_login_signin)).perform(click()) onView(withId(R.id.button_login_toapp)).check(matches(isDisplayed())) } }

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@MOLSJEROEN APP FLOW TESTING class AppFlowTest { @Rule @JvmField var mActivityTestRule = ActivityTestRule(MainActivity::class.java) @Test fun test_criticalUserFlow_throughoutEntireApp() { onView(withId(modularization.login.R.id.button_login_start)).perform(click()) onView(withId(modularization.login.R.id.button_login_signin)).perform(click()) onView(withId(modularization.login.R.id.button_login_toapp)).perform(click()) onView(withId(R.id.action_albums)).perform(click()) onView(withId(R.id.action_sharing)).perform(click()) onView(withId(R.id.button_social_facebook)).perform(click()) onView(withId(R.id.recyclerView_sharing_contacts)).check(matches(isDisplayed())) } }

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@MOLSJEROEN SCALING: TEAMS Team A Team B APP FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6 LIBRARY 4 LIBRARY 4 LIB 1 LIBRARY 2 LIBRARY 3

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@MOLSJEROEN APP 1 FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6 LIBRARY 1 LIBRARY 2 APP 2 FEATURE X FEATURE X SCALING: APPS

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@MOLSJEROEN SCALING: SDKS APP EXPOSED FEATURE WITH INTENT FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6 LIBRARY 4 AWESOME GITHUB LIBRARY LIB 1 SDK LIBRARY 3

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@MOLSJEROEN SCALING: TECHNOLOGY APP FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6 LIBRARY 4 LIBRARY 4 LIB 1 LIBRARY 2 LIBRARY 3

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@MOLSJEROEN IMPROVE LEGACY APP FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6 LIBRARY 4 LIBRARY 4 LIB 1 LIBRARY 2 LIBRARY 3

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@MOLSJEROEN IMPROVE LEGACY: REWRITE FEATURE APP FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6 LIBRARY 4 LIBRARY 4 LIB 1 LIBRARY 2 LIBRARY 3

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@MOLSJEROEN IMPROVE LEGACY: REWRITE FEATURE APP FEATURE 1 FEATURE 2 FEATURE 3 FEATURE 4 FEATURE 5 FEATURE 6 LIBRARY 4 LIBRARY 4 LIB 1 LIBRARY 2 LIBRARY 3 FEATURE 5*

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@MOLSJEROEN IMPROVE LEGACY: FEATURE FLAGS object Actions { fun openLoginIntent() = if (FeatureFlag.loginRewrite) { Intent("action.login2.open") } else { Intent("action.login.open") } }

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@MOLSJEROEN IMPROVE LEGACY: FEATURE FLAGS object Actions { fun openLoginIntent() = if (FeatureFlag.loginRewrite) { Intent("action.login2.open") } else { Intent("action.login.open") } }

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@MOLSJEROEN IMPROVE LEGACY: ROLL OUT

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@MOLSJEROEN

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@MOLSJEROEN ARCHITECTURE: RECAP Easy code navigation Simple in-feature and across feature navigation Better test automation Enables scaling Able to experiment with new technologies Staged rollout of rewritten features

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HOW TO APPROACH

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@MOLSJEROEN APP FEATURE FEATURE FEATURE FUTURE. FEATURE FUTURE FEATURE FUTURE FEATURE OLD APP LIB LIBRARY FUTURE LIBRARY APP FEATURE FEATURE FEATURE FUTURE FEATURE FUTURE FEATURE FUTURE FEATURE LIB 1 LIB FUTURE LIBRARY LIBRARY CHOOSE YOUR SIDE

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@MOLSJEROEN PULL CODE UP APP FEATURE FEATURE FEATURE FUTURE FEATURE FUTURE FEATURE FUTURE FEATURE OLD APP LIB LIBRARY FUTURE LIBRARY Pull modules up

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@MOLSJEROEN PULL CODE UP Conceptually very simple Extract features without dependency issues Huge upfront change Encourages gradual modularization Incompatible with Butterknife: change to R2.id.*** Features need to be extracted before libraries

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@MOLSJEROEN PUSH CODE DOWN APP FEATURE FEATURE FEATURE FUTURE FEATURE FUTURE FEATURE FUTURE FEATURE LIB 1 LIB FUTURE LIBRARY LIBRARY Push modules down

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@MOLSJEROEN PUSH CODE DOWN Initially a lot harder Extract libraries without dependency issues No big upfront change Forces aggressive modularisation Better grip on modularisation process Bottom up code clean up

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@MOLSJEROEN APP FEATURE FEATURE FEATURE FUTURE. FEATURE FUTURE FEATURE FUTURE FEATURE OLD APP LIB LIBRARY FUTURE LIBRARY APP FEATURE FEATURE FEATURE FUTURE FEATURE FUTURE FEATURE FUTURE FEATURE LIB 1 LIB FUTURE LIBRARY LIBRARY CHOOSE YOUR SIDE

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@MOLSJEROEN APP FEATURE FEATURE FEATURE FUTURE. FEATURE FUTURE FEATURE FUTURE FEATURE OLD APP LIB LIBRARY FUTURE LIBRARY APP FEATURE FEATURE FEATURE FUTURE FEATURE FUTURE FEATURE FUTURE FEATURE LIB 1 LIB FUTURE LIBRARY LIBRARY CHOOSE YOUR SIDE

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@MOLSJEROEN CONSIDERATIONS Make a big initial push Aggressively restrict visibility Combine with general code improvements Postpone/avoid problems • Cut dependencies using abstractions • Deprecate and rewrite • Clean up internals later

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WHEN PLANNING IS LONG THEN IT’S WRONG, IF IT’S TIGHT THEN IT’S RIGHT Elon musk

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LESSONS LEARNED

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@MOLSJEROEN CONFIGURE MODULES Adding a new module must be easy Maintaining module configurations must be easy

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@MOLSJEROEN CONFIGURE MODULES subprojects { afterEvaluate { project -> if (project.hasProperty('android')) { android { buildToolsVersion Config.buildTools compileSdkVersion Config.compileSdk defaultConfig { minSdkVersion Config.minSdk targetSdkVersion Config.targetSdk } compileOptions { sourceCompatibility Config.javaVersion targetCompatibility Config.javaVersion } } } } }

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@MOLSJEROEN CONFIGURE MODULES subprojects { afterEvaluate { project -> if (project.hasProperty('android')) { android { buildToolsVersion Config.buildTools compileSdkVersion Config.compileSdk defaultConfig { minSdkVersion Config.minSdk targetSdkVersion Config.targetSdk } compileOptions { sourceCompatibility Config.javaVersion targetCompatibility Config.javaVersion } } } } }

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@MOLSJEROEN CONFIGURE MODULES subprojects { afterEvaluate { project -> if (project.hasProperty('android')) { android { buildToolsVersion Config.buildTools compileSdkVersion Config.compileSdk defaultConfig { minSdkVersion Config.minSdk targetSdkVersion Config.targetSdk } compileOptions { sourceCompatibility Config.javaVersion targetCompatibility Config.javaVersion } } } } }

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@MOLSJEROEN CONFIGURE MODULES apply plugin: 'com.android.library' apply plugin: 'kotlin-android-extensions' apply plugin: 'kotlin-android' dependencies { implementation project(':libraries:ui-components') implementation project(':libraries:actions') implementation Deps.androidx_material implementation Deps.androidx_constraintlayout implementation Deps.androidx_navigation_fragment implementation Deps.androidx_navigation_ui testImplementation Deps.testlib_junit androidTestImplementation Deps.testandroidx_runner androidTestImplementation Deps.testandroidx_rules androidTestImplementation Deps.testandroidx_espressocore }

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@MOLSJEROEN CONFIGURE MODULES

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@MOLSJEROEN MODULE GRAPH apply from: 'https://raw.githubusercontent.com/JakeWharton/SdkSearch/master/ gradle/projectDependencyGraph.gradle' ./gradlew projectDependencyGraph

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@MOLSJEROEN MODULE GRAPH

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@MOLSJEROEN ORGANIZE SETTINGS.GRADLE include ':app', ':features:login', ':features:dashboard', ':features:sharing', ':libraries:ui- components', ':libraries:actions'

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@MOLSJEROEN ORGANIZE SETTINGS.GRADLE include ':app' include ':features:login' include ':features:dashboard' include ':features:sharing' include ':libraries:ui-components' include ':libraries:actions'

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@MOLSJEROEN ORGANIZE SETTINGS.GRADLE include ':app' include ':features:login' include ':features:dashboard' include ':features:sharing' include ':libraries:ui-components' include ':libraries:actions'

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@MOLSJEROEN MODULE INTERNALS

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@MOLSJEROEN MODULE INTERNALS - ORGANIZATION

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@MOLSJEROEN MODULE INTERNALS - ORGANIZATION

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@MOLSJEROEN MODULE INTERNALS - PACKAGE NAME features: [project-name].features.[feature-name]
 e.g. modularization.features.login libraries: [project-name].libraries.[library-name]
 e.g. modularization.libraries.actions

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@MOLSJEROEN MODULE INTERNALS - PACKAGE NAME import android.content.Intent import android.os.Bundle import androidx.appcompat.app.AppCompatActivity import modularization.features.login.LoginActivity import modularization.features.sharing.SharingActivity import modularization.features.dashboard.DashboardActivity import modularization.libraries.actions.Actions import modularization.libraries.uicomponents.RoundedButton

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@MOLSJEROEN LAYOUT PREVIEWS

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@MOLSJEROEN LAYOUT PREVIEWS

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@MOLSJEROEN LAYOUT PREVIEWS

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@MOLSJEROEN LAYOUT PREVIEWS

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@MOLSJEROEN LAYOUT PREVIEWS

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@MOLSJEROEN DEPENDENCY MANAGEMENT object Config { val minSdk = 23 val javaVersion = JavaVersion.VERSION_1_8 val buildTools = "28.0.3" } object Versions { val androidx_core = "1.0.1" val androidx_nav = "2.0.0" ... } object Deps { val androidx_core = "androidx.core:core-ktx:${Versions.androidx_core}" val androidx_nav_fragment = "androidx.navigation:navigation-fragment-ktx:${Versions.androidx_nav}" val androidx_nav_ui = “androidx.navigation:navigation-ui-ktx:${Versions.androidx_nav}" ... }

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@MOLSJEROEN CONFIGURE MODULES apply plugin: 'com.android.library' apply plugin: 'kotlin-android-extensions' apply plugin: 'kotlin-android' dependencies { implementation project(':libraries:ui-components') implementation project(':libraries:actions') implementation Deps.androidx_material implementation Deps.androidx_constraintlayout implementation Deps.androidx_navigation_fragment implementation Deps.androidx_navigation_ui testImplementation Deps.testlib_junit androidTestImplementation Deps.testandroidx_runner androidTestImplementation Deps.testandroidx_rules androidTestImplementation Deps.testandroidx_espressocore }

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@MOLSJEROEN DEPENDENCY MANAGEMENT ./gradlew dependencyUpdates

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@MOLSJEROEN SPEED UP BUILDS dependencies { // Avoid doing this api project(':libraries:ui-components') // Do this instead implementation project(':libraries:ui-components') }

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@MOLSJEROEN API VS IMPLEMENTATION DEPENDENCY APP

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@MOLSJEROEN API DEPENDENCY APP

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@MOLSJEROEN API DEPENDENCY APP

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@MOLSJEROEN API DEPENDENCY APP

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@MOLSJEROEN IMPLEMENTATION DEPENDENCY APP

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WRAP UP

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THERE ARE NO BIG PROBLEMS, THERE ARE JUST A LOT OF LITTLE PROBLEMS. Henry Ford

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@MOLSJEROEN MODULARIZATION HAS TONS OF BENEFITS APP FEATURES LIBRARIES NAVIGATION WITHIN AND BETWEEN FEATURES PUSH CODE DOWN SIMPLIFY ADDING MODULES

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@MOLSJEROEN

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@MOLSJEROEN HTTPS://JEROENMOLS.COM/BLOG

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@MOLSJEROEN REFERENCES Blog posts: 1. http://bit.ly/modularization_why 2. http://bit.ly/modularization_architecture 3. http://bit.ly/modularization_example 4. http://bit.ly/modularization_how 5. http://bit.ly/modularization_lessons http://bit.ly/modularization_code

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@MOLSJEROEN IMAGE CREDITS Welcome image by Clement127 https://flic.kr/p/n9ctTn Official Android documentation https://d.android.com Font awesome https://fontawesome.com/

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MOLSJEROEN