android-java
by alinaqiandroid-java skill for Android Java development in existing apps using MVVM, ViewBinding, and Espresso testing. It helps you work in the right folders, follow project structure, and handle frontend development tasks with less guesswork.
This skill scores 69/100, which means it is listable but best presented with a caution that it is more of a structured Android Java guidance pack than a fully operational automation skill. For directory users, it offers enough workflow specificity to reduce guesswork versus a generic prompt, but not enough tooling or executable support to feel fully turnkey.
- Valid frontmatter with a clear trigger: Android Java development for source files, especially under `**/*.java`, `android/**`, and `**/build.gradle`.
- Substantial body content with multiple headings and code-fence examples, including project structure and workflow-oriented guidance.
- Covers useful Android Java patterns such as MVVM, ViewBinding, Espresso testing, and layered app structure, which can help agents navigate real codebases.
- No install command, scripts, or support files, so there is little evidence of automation or deeper operational scaffolding.
- The repository evidence shows limited explicit constraints and only modest workflow signal, so agents may still need interpretation for edge cases and task boundaries.
Overview of android-java skill
What android-java is for
android-java is a focused Android Java skill for working inside Java-based Android app code, especially when the project uses MVVM, ViewBinding, and Espresso tests. It is most useful when you need the android-java skill to edit or extend source files without guessing the project’s Android structure.
Who should use it
Use this android-java skill if you are changing screens, ViewModels, repositories, Gradle setup, or test code in an Android app written in Java. It is a good fit for frontend development work on Android when the main job is wiring UI, state, and app structure correctly rather than inventing a new architecture from scratch.
What makes it different
The main value is practical guidance for common Android app layers: data, domain, ui, dependency injection, and test folders. That makes the android-java guide more useful than a generic Android prompt because it helps you preserve project conventions while making changes. It is less helpful if your app is Kotlin-first, Compose-first, or heavily framework-specific.
How to Use android-java skill
Install and open the right files
For android-java install, add the skill through your directory tool or skill manager, then open SKILL.md first. From there, read the surrounding project context that usually matters most: README.md, AGENTS.md, metadata.json, and any rules/, resources/, references/, or scripts/ folders if they exist. In this repository, the skill body is concentrated in one file, so SKILL.md is the key starting point.
Give the skill a concrete Android task
The android-java usage works best when your prompt names the exact feature, file area, and constraint. Instead of asking for “help with Android,” ask for something like: “Update the login flow in app/src/main/java/.../ui/login/ to support error states, keep MVVM, and add Espresso coverage for the failure path.” That gives the android-java skill enough context to make correct choices about layer placement, naming, and test scope.
Read the repository path before editing
Use the file tree in the skill to orient your work: app/src/main/java/.../data for local or remote data access, domain for business rules, ui for activities, fragments, and ViewModels, and androidTest for instrumentation coverage. If you are unsure where a change belongs, inspect the nearest feature folder first, then follow dependencies outward instead of rewriting the whole app.
Prompt for architecture and test intent
A strong android-java guide prompt should state architecture expectations and acceptance criteria. Example: “Add a repository method that fetches user details, expose it through a ViewModel, update the fragment UI with ViewBinding, and include a unit test for the repository plus an Espresso test for the happy path.” This is better than a vague feature request because it tells the skill what layers must change and what proof of correctness you expect.
android-java skill FAQ
Is android-java only for frontend development?
No. The android-java for Frontend Development angle is real, but the skill also covers data flow, repositories, dependency injection, and tests that affect UI behavior. If your task touches app logic that feeds the screen, this skill can still help.
Do I need an existing Android Java project to use it?
Yes, that is the best fit. The android-java skill is designed for working inside an existing Java Android codebase with established folders and Gradle files. It is not a general Java backend skill and is not the right choice for a blank app concept with no structure yet.
How is this different from a normal prompt?
A normal prompt may produce generic Android advice. android-java is more useful when you want the model to respect Android project layout, keep changes in the right layer, and think about ViewBinding, MVVM, and Espresso together. That reduces cleanup work after the first draft.
When should I not use it?
Skip android-java install if your project is Kotlin-only, Jetpack Compose-first, or the main task is unrelated to Android source files. It is also a weaker fit if you need deep product design help rather than implementation help.
How to Improve android-java skill
Give it the smallest complete feature brief
The best outputs come from inputs that name the screen, data source, and success/failure behavior. For example: “In FeatureFragment, show loading, empty, and error states for the new API response, and keep the ViewModel as the only place that formats UI state.” This is better than “make the screen better” because it constrains the implementation and prevents unnecessary refactors.
State constraints that affect the implementation
If your project uses Hilt, Retrofit, Room, or existing ViewBinding patterns, say so explicitly. The android-java skill produces better code when you mention constraints like minSdk, compatibility requirements, test type, or whether you want to avoid introducing new libraries. Those details often decide whether a suggestion is actually shippable.
Ask for tests and the expected edge cases
To improve android-java usage, request the test layer you need and list the edge cases you care about. For example: “Add unit tests for null response handling and an Espresso test for tapping retry after a network failure.” This helps the skill move beyond a happy-path implementation and match real Android app behavior.
Iterate by reviewing file placement first
After the first answer, check whether the change landed in the right folders and whether the dependencies still flow from UI to domain to data cleanly. If the output is close but not aligned, ask for a narrower revision such as “move parsing out of the fragment,” “keep this logic in the repository,” or “convert this to ViewBinding only.”