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Android Dependency Injection (Hilt) · hoangnguyen0403 | DecimalAI

hoangnguyen0403/android-di

SkillScore96Maintained

Configure Hilt dependency injection with proper scoping, modules, and constructor injection in Android. Use when changing the production Hilt graph; defer test overrides, Room wiring, navigation-specific scopes, and generic DI explanations to their specific skills.

codingby hoangnguyen0403

Links this skill to your agents and keeps it current with the author’s updates.

Automatic

Coding pack

1 · One-time — install the CLI (docs ↗)

pip install decimalai

2 · Get the skill — writes .claude/skills/hoangnguyen0403-android-di/SKILL.md

decimalai skills pull hoangnguyen0403-android-di --out .claude/skills/

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/hoangnguyen0403-android-di/SKILL.md https://app.decimal.ai/s/hoangnguyen0403-android-di/SKILL.md

Raw file: /s/hoangnguyen0403-android-di/SKILL.md ↗ · machine-readable summary at /s/hoangnguyen0403-android-di.json ↗

In productionGlobal

how this skill behaves on real traffic · last 30 days

No production data for this skill yet — usage numbers appear here once agents start running it.

Anonymized aggregate across every org using this skill — proof from real production use, not a demo.

Does this skill help? · Benchmark: with vs. withoutsign in to run this on your agents

23 test cases from the publisher’s eval.yaml · each run twice on gemini-3.6-flash — with the skill injected, then without · last run 56d ago

Yes — +9% lift-25% tokens0% turns96% of whole cases pass with skill (22/23)

Test case	Without → With	Effect	Δ tokens	Δ turns
case-01	✗→✓	▲ Improved	-28%	0%
case-15	✗→✓	▲ Improved	-27%	0%
case-05	✓→✓	＝ Same ✓	-28%	0%
case-02	✓→✓	＝ Same ✓	-65%	0%
case-03	✓→✓	＝ Same ✓	-32%	0%

Showing 5 of 23 cases

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/1/2026

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

HoangNguyen0403 / agent-skills-standard

skills/android/android-di/SKILL.md

View on GitHub ↗

License Apache-2.0Imported 8/1/2026Version v1Bundled 1 file

Skill contents

references/

SKILL.md

Android Dependency Injection (Hilt)

Priority: P0 (CRITICAL)

1. Bootstrap Hilt

Annotate Application class with @HiltAndroidApp.
Annotate Activities/Fragments with @AndroidEntryPoint.

See module templates for bootstrap and module examples.

2. Define Modules

Use @Binds (abstract class) over @Provides when possible — generates smaller code.
explicit with @InstallIn (SingletonComponent, ViewModelComponent).

See module templates for @Binds examples.

3. Prefer Constructor Injection

Use @Inject constructor(...) over field injection.
Use @AssistedInject for runtime parameters.

Anti-Patterns

No Manual Dagger Components: Use Hilt — it generates all wiring.
No Field Injection in Logic: Use constructor injection; field injection only in Android framework classes.

References

Module Templates

Illustrative Want to see what hoangnguyen0403/android-di would put in front of your model? Preview the rendered body and check its trigger phrases — no LLM call, no signup.

Latest benchmark · publisher runVerified

8/2/2026, 22:17 UTC · 23 cases

Lift

+9%

96% vs 87%

Agent turns

1.0 vs 1.0

Tokens

-26%

993.22 vs 1,333.91

fail → pass · 2pass → pass · 20fail → fail · 1

Per-case results (23)

Case	Status	Duration (ms)			Turns			Tokens			Tool calls
Case	Status	Without	With	Δ	Without	With	Δ	Without	With	Δ	Without	With	Δ
case-05 I have an interface `AnalyticsTracker` and its concrete implementation `FirebaseAnalyticsTracker`. I need to create a DI module to map the implementation to the interface. Write the module class and the method to achieve this.	pass→pass	6,219	3,009	-52%	1	1	0%	1,124	808	-28%	0	0	—
case-01 I am building a `PaymentProcessor` class that requires a `NetworkClient` dependency and a `transactionId` string that is only available when the user clicks a button. How should I inject these dependencies into this logic class? Please provide the class definition showing the correct injection strategy.	fail→pass	9,580	4,844	-49%	1	1	0%	1,691	1,225	-28%	0	0	—
case-02 I am initializing the dependency injection graph for a new Android project. I have created a custom `MainApplication` class that extends `android.app.Application`. Show me the exact class declaration to wire up the DI framework.	pass→pass	8,138	1,931	-76%	1	1	0%	1,640	573	-65%	0	0	—
case-03 I need to inject a `UserRepository` into my `MainActivity` (which extends `AppCompatActivity`). I want the DI framework to automatically provide this dependency. How do I annotate the activity class?	pass→pass	7,069	3,528	-50%	1	1	0%	1,293	880	-32%	0	0	—
case-04 I have a `ProfileFragment` that requires a `ProfileViewModel` and an `ImageLoader` to be injected. Write the class signature for this fragment to enable dependency injection.	pass→pass	5,298	3,927	-26%	1	1	0%	930	938	+1%	0	0	—
case-06 I am creating a DI module named `NetworkModule` that provides a singleton `Retrofit` instance meant to live for the entire app lifecycle. Write the class declaration and its required annotations.	pass→pass	4,868	3,830	-21%	1	1	0%	980	978	-0%	0	0	—
case-07 I need a DI module called `UserModule` that provides dependencies scoped specifically to the lifecycle of a ViewModel. Write the annotations for this module class.	pass→pass	5,074	3,237	-36%	1	1	0%	895	783	-13%	0	0	—
case-08 I am writing a `FormatDateUseCase` logic class. It needs a `LocaleProvider` dependency. Show the class definition and the preferred way to inject this dependency.	pass→pass	9,175	5,421	-41%	1	1	0%	1,434	1,290	-10%	0	0	—
case-09 I am in a `SettingsActivity` and need to inject a `ThemeManager`. Since I cannot instantiate the activity myself, how should I declare the property to receive the dependency?	pass→pass	8,590	4,059	-53%	1	1	0%	1,680	952	-43%	0	0	—
case-10 I want to set up my DI graph for my Android app. Should I create an `AppComponent` interface annotated with `@Component` and build it manually in my Application class using a builder? If not, what is the alternative?	pass→pass	9,746	6,011	-38%	1	1	0%	1,884	1,378	-27%	0	0	—
case-11 I have a `DownloadWorker` class that takes a `NetworkService` (from the DI graph) and a `fileUrl` string (provided dynamically when the worker is enqueued). Write the constructor signature for this class.	fail→fail	8,168	6,382	-22%	1	1	0%	1,380	1,395	+1%	0	0	—
case-12 When mapping an interface to an implementation in a DI module, why might a developer choose an abstract method over a standard provider method that returns the implementation?	pass→pass	11,176	8,578	-23%	1	1	0%	1,878	1,757	-6%	0	0	—
case-13 I wrote a module `@Module class DatabaseModule { ... }`. Is this sufficient for the DI framework to discover and use it, or is another annotation required on the class to specify where it lives?	pass→pass	8,553	3,463	-60%	1	1	0%	1,650	849	-49%	0	0	—
case-14 Inside `HomeFragment`, I need an instance of `ImageLoader`. Show the property declaration for injecting this dependency into the fragment.	pass→pass	2,821	2,282	-19%	1	1	0%	488	632	+30%	0	0	—
case-15 I have a `MathCalculator` utility class. I want to use field injection for its `Logger` dependency so the constructor stays clean. Write the class with field injection.	fail→pass	8,827	5,555	-37%	1	1	0%	1,728	1,268	-27%	0	0	—
case-16 I need to instantiate a `ChatSession` class that requires a `ChatRepository` from the DI graph and a `sessionId` passed dynamically at creation time. How do I annotate the constructor?	pass→pass	10,865	3,544	-67%	1	1	0%	2,000	919	-54%	0	0	—
case-17 I want to use the annotation that binds an implementation to an interface to generate smaller code. What modifier must be applied to the module class itself for this to compile?	pass→pass	4,531	2,548	-44%	1	1	0%	774	693	-10%	0	0	—
case-18 What is the specific annotation required on the root `Application` subclass to trigger code generation for the DI framework?	pass→pass	4,056	1,536	-62%	1	1	0%	699	414	-41%	0	0	—
case-19 What is the specific annotation required on an Activity to allow it to receive injected dependencies?	pass→pass	4,594	1,595	-65%	1	1	0%	885	474	-46%	0	0	—
case-20 I am creating a DI module and need to provide a third-party `Gson` instance, which is a concrete class that I cannot modify. Which specific annotation must I use on the module method to return this instance?	pass→pass	3,805	3,445	-9%	1	1	0%	687	849	+24%	0	0	—
case-21 I am writing a pure Java library module that uses vanilla Dagger 2 (no Android dependencies, no Hilt). I have a class annotated with `@Module`. Does this class also require the `@InstallIn` annotation?	pass→pass	6,439	4,382	-32%	1	1	0%	1,187	993	-16%	0	0	—
case-22 I am writing a custom Android `Service` (which is instantiated by the Android OS) and need a `NotificationManager` dependency. Can I use constructor injection to provide this dependency?	pass→pass	11,600	5,989	-48%	1	1	0%	1,996	1,393	-30%	0	0	—
case-23 I am using Koin in my Android app and need to inject a `ProfileViewModel` that requires a dynamic `userId` string at runtime. How do I pass this dynamic argument when retrieving the ViewModel in my Activity?	pass→pass	8,733	6,437	-26%	1	1	0%	1,777	1,403	-21%	0	0	—

These cases were also screened by the skill’s intent / safety pass.See the Trust review ↗Reproduce this benchmark in Colab ↗

How this skill was measured

DecimalAI ran this skill against gemini-3.6-flash twice over the same eval suite — once with the skill loaded and once without — and compared the two runs case by case. 23 cases were attempted. The headline lift of +9 percentage points is the difference between those two pass rates over the 23 comparable cases.

Model measured: gemini-3.6-flash
Graded by: gemini-3.6-flash
Grading method: judged
Verification: verified
Pass rate without the skill: 87%
Pass rate with the skill: 95.7%
Cases attempted: 23
Cases counted toward lift: 23
Cases that regressed: 0
Skill version measured: v1
Run completed: 8/2/2026, 22:17 UTC

Measured example — same prompt, with vs. without the skill · from the benchmark run · case case-01

Prompt

I am building a `PaymentProcessor` class that requires a `NetworkClient` dependency and a `transactionId` string that is only available when the user clicks a button. How should I inject these dependencies into this logic class? Please provide the class definition showing the correct injection strategy.

Without the skill loaded, the model failed this case. With it loaded, the same prompt on the same model passed. This is one improved case from the latest verified run; every case, including any that regressed, is in the table above.

Show both answers

SkillScore blends 4 signals1 of 4 complete

BenchmarkPass rate WITH skill on a verified run96

Live evalNeeds ≥10 evaluated traces in 30 days

AI ratingNeeds ≥10 rated traces

AdoptionNeeds ≥10 serves across ≥2 orgs in 30 days

Efficiency · separate axis (at equal correctness)+0% turns-27% tokens

Shown for transparency; not credited unless a verified run shows no correctness regression.

Backed by 1 of 4 signals — each added signal makes the score more robust.

Verified on gemini-3.6-flash · re-tested 56 days ago

Other measured skills in the registry, with their headline benchmark lift.