Android Gradle Skill

Automate Gradle tasks for Android projects: build, test, coverage, clean.

When to Use

• Building debug/release APK
• Running unit tests
• Generating coverage reports
• Cleaning build cache
• Checking dependencies

Commands

Build Commands

Test Commands

Coverage Commands

Dependency Commands

Usage Examples

# Build and install debug APK
./gradlew assembleDebug && ./gradlew installDebug

# Run specific test class
./gradlew test --tests "*.GameManagerImplTest"

# Generate coverage report
./gradlew jacocoTestDebugUnitTestReport
# Report at: app/build/reports/jacoco/jacocoTestDebugUnitTestReport/html/index.html

# Clean rebuild
./gradlew clean assembleDebug

Timeout Configuration

Version Compatibility

Error Handling

// Handle build failures in scripts
fun handleGradleResult(exitCode: Int, output: String) {
    when {
        exitCode != 0 && output.contains("Compilation failed") ->
            println("Fix compilation errors in: ${extractErrorFiles(output)}")
        exitCode != 0 && output.contains("AAPT") ->
            println("Resource error - check XML files")
        exitCode != 0 && output.contains("OutOfMemoryError") ->
            println("Increase heap: org.gradle.jvmargs=-Xmx4g")
    }
}

Common Errors:

• Build failure: Parse error message, check file:line references
• Test failure: Run with --info for stack traces
• Coverage below threshold: Check app/build/reports/jacoco/*/html/index.html
• OOM: Increase heap in gradle.properties

Test Result Validation

# Run tests and validate results
./gradlew testDebugUnitTest && echo "✓ All tests passed" || echo "✗ Tests failed"

# Check coverage threshold
./gradlew jacocoTestDebugUnitTestReport
# Verify: app/build/reports/jacoco/jacocoTestDebugUnitTestReport/html/index.html
# Target: 80%+ line coverage

# Parse test results programmatically
cat app/build/test-results/testDebugUnitTest/*.xml | grep -E "(tests=|failures=)"

Troubleshooting

Command Workflows

# Full CI workflow
./gradlew clean testDebugUnitTest jacocoTestDebugUnitTestReport assembleDebug

# Quick iteration
./gradlew assembleDebug -x lint -x test && ./gradlew installDebug

# Pre-commit check
./gradlew ktlintCheck testDebugUnitTest

CI/CD Integration

# GitHub Actions example
- name: Build & Test
  run: |
    ./gradlew testDebugUnitTest
    ./gradlew jacocoTestDebugUnitTestReport
    ./gradlew assembleDebug

- name: Upload Coverage
  uses: codecov/codecov-action@v4
  with:
    files: app/build/reports/jacoco/*/jacoco*.xml

Best Practices

• Always use Gradle wrapper (./gradlew), never system Gradle
• Use --parallel for multi-module projects
• Enable configuration cache for faster builds
• Skip lint with -x lint if not needed for quick iterations

References

• Gradle User Guide
• Android Gradle Plugin
• JaCoCo Coverage