Tips for implementing Android Dynamic Feature Module

At CA.apk#9, I have talked about the merit for implementing features with Dynamic Feature Module (DFM), and shared some tips for implementing features with DFM.

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Official Docs
* Android App Bundles | Android Developers
https://developer.android.com/guide/app-bundle

* About Dynamic Delivery  |  Android Developers
https://developer.android.com/guide/app-bundle/dynamic-delivery

* About Conditional Delivery | Android Developers
https://developer.android.com/guide/app-bundle/conditional-delivery

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Other Presentations regarding DFM(JP)
* Dynamic Feature Module in Practice
https://speakerdeck.com/star_zero/droidkaigi-2020

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Other Links
* R8 & DataBinding with DFM
https://stackoverflow.com/questions/54404492/proguard-with-appbundle-and-data-binding-illegalstateexception
https://issuetracker.google.com/issues/139046605

* Delivery Config - Apk
https://stackoverflow.com/questions/54844007/how-to-generate-full-apk-file-including-dynamic-feature-module

* Jacoco Config
https://github.com/arturdm/jacoco-android-gradle-plugin/issues/80
https://github.com/vanniktech/gradle-android-junit-jacoco-plugin/pull/158

Transcript

1. DFM Tips
   
   @shoheikawano
   @_shoheikawano
   

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2. Content
   ・Why DFM?
   ・Tips for adding feature with DFM
   ・Conclusion

   

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3. Why DFM?
   

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4. Why DFM?
   ・”Ability to customize how and when the feature
   to be downloaded onto devices running Android
   5.0”
   　・Reduce initial App install size
   https://developer.android.com/guide/app-bundle/dynamic-delivery
   

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5. Why DFM?
   0
   17
   34
   Without DFM with DFM
   Initial App Intall Size ※Estimate
   

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6. Tips
   

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7. Tips Delivery Config
   Jacoco Config
   R8 & DataBinding
   

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8. Tips
   R8 & DataBinding
   Delivery Config
   Jacoco Config
   

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9. R8 & DataBinding
   

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10. R8 & DataBinding
    // app/build.gradle
    release {
    minifyEnabled = true
    }
    

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11. R8 & DataBinding
    // dynamic-feature-module/build.gradle
    buildFeatures {
    dataBinding = true
    }
    // app/build.gradle
    release {
    minifyEnabled = true
    }
    

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12. R8 & DataBinding
    // dynamic-feature-module/build.gradle
    buildFeatures {
    dataBinding = true
    }
    // dynamic-feature-module/DynamicActivity.kt
    DataBindingUtil.setContentView(this, layoutId)
    // app/build.gradle
    release {
    minifyEnabled = true
    }
    

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13. R8 & DataBinding
    // dynamic-feature-module/build.gradle
    buildFeatures {
    dataBinding = true
    }
    // dynamic-feature-module/DynamicActivity.kt
    DataBindingUtil.setContentView(this, layoutId)
    Release Build
    // app/build.gradle
    release {
    minifyEnabled = true
    }
    

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14. R8 & DataBinding
    //dynamic-feature-module/build.gradle
    buildFeatures {
    dataBinding = true
    }
    // DynamicActivity.kt
    DataBindingUtil.setContentView(this, layoutId)
    Release Build
    //app/build.gradle
    release {
    minifyEnabled = true
    } RuntimeException
    
    java.lang.RuntimeException: Unable to start activity
    ComponentInfo{...DynamicActivity}: java.lang.IllegalStateException:
    DataBindingUtil.setConte… R.layout.dynamic_activity) must not be null
    Caused by: java.lang.IllegalStateException: DataBindingUtil.setConte…
    R.layout.dynamic_activity) must not be null
    at DynamicActivity.onCreate(DynamicActivity.kt:38)
    

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15. # dynamic-feature-module/proguard-rules-dynamic-features.pro
    -keep class your.dfm.package.name.DataBinderMapperImpl { *; }
    https://issuetracker.google.com/issues/139046605
    R8 & DataBinding
    https://stackoverflow.com/questions/54404492/proguard-with-appbundle-and-data-binding-illegalstateexception
    // dynamic-feature-module/build.gradle
    buildTypes {
    release {
    proguardFiles 'proguard-rules-dynamic-features.pro'
    }
    }
    

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16. Tips Delivery Config
    Jacoco Config
    R8 & DataBinding
    

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17. Tips Delivery Config
    Jacoco Config
    R8 & DataBinding
    

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18. Delivery Config - Install
    

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24. Delivery Config - Apk
    

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34. Delivery Config - Apk
    

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36. Delivery Config - Apk
    

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42. // dynamic-feature-module/build.gradle
    productFlavors {
    flavor1 {
    manifestPlaceholders = [include_fusing: true, exclude_install_time: false]
    }
    flavor2 {
    manifestPlaceholders = [include_fusing: false, exclude_install_time: true]
    }
    }
    ...
    Delivery Config - Apk
    

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43. Tips Delivery Config
    Jacoco Config
    R8 & DataBinding
    

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44. Tips Delivery Config
    Jacoco Config
    R8 & DataBinding
    

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45. Jacoco Config
    // root/build.gradle
    dependencies {
    classpath ‘com.dicedmelon.gradle:jacoco-android:0.1.4'
    }
    // dynamic-feature-module/build.gradle
    apply plugin: 'jacoco-android'
    

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46. Jacoco Config
    // root/build.gradle
    dependencies {
    classpath ‘com.dicedmelon.gradle:jacoco-android:0.1.4'
    }
    // dfm/build.gradle
    apply plugin: 'jacoco-android'
    * What went wrong:
    A problem occurred evaluating script.
    > Failed to apply plugin [id 'jacoco-android']
    > You must apply the Android plugin or the Android library plugin before
    using the jacoco-android plugin
    
    

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47. Jacoco Config
    // root/build.gradle
    dependencies {
    classpath ‘com.dicedmelon.gradle:jacoco-android:0.1.4'
    }
    // dynamic-feature-module/build.gradle
    apply plugin: 'jacoco-android'
    

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48. Jacoco Config
    // root/build.gradle
    dependencies {
    classpath ‘com.dicedmelon.gradle:jacoco-android:0.1.4'
    }
    // dynamic-feature-module/build.gradle
    apply plugin: 'jacoco-android'
    

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49. Jacoco Config
    // root/build.gradle
    dependencies {
    classpath ‘com.dicedmelon.gradle:jacoco-android:0.1.4'
    }
    // dynamic-feature-module/build.gradle
    apply plugin: 'jacoco-android'
    

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50. Jacoco Config .. Alternative?
    

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51. Conclusion
    

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52. Tips
    Why DFM?
    — To reduce App Install Size — Keep DataBinderMapperImpl
    — Configure delivery options Carefully
    — Use fusing / include option for APK
    — Use manifest placeholder if necessary
    — Some Jacoco android gradle plugin(s)
    just do not work with DFM
    Conclusion
    

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53. DFM Tips
    
    @shoheikawano
    @_shoheikawano
    Thank you!
    

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