Android Dependency Class Lookup

Automatically indexes classes from Gradle-cached AAR/JAR dependencies and provides

instant API lookups. Zero external dependencies — pure Python standard library.

When to Use

• Encountering unknown classes (especially from internal or third-party AAR dependencies)
• Needing to know the exact API of a dependency library
• Wanting to use a library's feature but unsure about method signatures
• Confirming which dependency a class belongs to

Lookup Flow

Step 1: Get the Fully Qualified Class Name

Always check import statements first — the same simple class name may exist in multiple libraries:

1. Look at import statements at the top of the file for the FQCN (e.g., com.example.StringUtils)
2. Use FQCN for precise lookup
3. Only use simple class name or fuzzy search when import is unavailable

Step 2: Identify the Module Path

The tool needs the Android module path (directory containing build.gradle or build.gradle.kts).

Step 3: Run the Query

Script location: scripts/lookup_class.py (relative to this skill directory)

Lookup by class name (most common):

python3 <SKILL_DIR>/scripts/lookup_class.py -p <MODULE_PATH> -c <class_name>

Examples:

# Precise lookup with FQCN (recommended)
python3 scripts/lookup_class.py -p /path/to/module -c com.example.StringUtils

# Simple name lookup (returns all matches)
python3 scripts/lookup_class.py -p /path/to/module -c StringUtils

# Show full source code instead of API summary
python3 scripts/lookup_class.py -p /path/to/module -c StringUtils --source

Other queries:

# List all classes in a package
python3 scripts/lookup_class.py -p <MODULE_PATH> --package com.example.util

# List all classes in a library
python3 scripts/lookup_class.py -p <MODULE_PATH> --library com.example:utils

# Fuzzy search
python3 scripts/lookup_class.py -p <MODULE_PATH> --search Toast

# Index statistics
python3 scripts/lookup_class.py -p <MODULE_PATH> --stats

Step 4: Use the Results

Results are JSON with: class (FQCN), library (Maven coordinate), version, and api_summary (public method signatures with Javadoc when sources.jar is available).

Key Features

• Auto-indexing: First query builds the index automatically (~0.5s), subsequent queries use cache (~0.1s)
• Auto-invalidation: Rebuilds when build.gradle changes
• Dual extraction: Prefers sources.jar for source-level API (with Javadoc), falls back to javap
• Gradle DSL support: Both Groovy (build.gradle) and Kotlin DSL (build.gradle.kts)
• Dependency configs: implementation, api, compileOnly, runtimeOnly, kapt, ksp, annotationProcessor, etc.

Coding Guidelines

When writing code based on lookup results:

• Prefer internal utility classes over reinventing the wheel
• When a class exists in multiple libraries, use the one already imported in the current file
• Match method signatures and parameter types exactly as shown in the API summary