Production Quality Skill

Quick Start

Unit Testing

@Test
fun loadUser_updates_state() = runTest {
    val user = User(1, "John")
    val mockRepo = mockk<UserRepository>()
    coEvery { mockRepo.getUser(1) } returns user
    
    val viewModel = UserViewModel(mockRepo)
    viewModel.loadUser(1)
    
    assertEquals(user, viewModel.state.value)
}

Security

// Encrypted storage
val prefs = EncryptedSharedPreferences.create(context, "secret",
    MasterKey.Builder(context).build(), AES256_SIV, AES256_GCM)

// SSL pinning
CertificatePinner.Builder()
    .add("api.example.com", "sha256/...").build()

Play Store Deployment

./gradlew bundleRelease
# Upload to Google Play Console
# Monitor crashes and ratings

Key Concepts

Testing

• Unit tests (70-80% coverage)
• Integration tests
• UI tests with Espresso
• Mock external dependencies

Performance

• ANR prevention
• Memory leak detection
• 60 FPS target
• Battery optimization

Security

• Data encryption
• HTTPS/SSL pinning
• Permission handling
• OWASP Top 10

Deployment

• Internal → Closed → Open → Production
• Staged rollout strategy
• Crash analytics monitoring
• User rating management

Best Practices

✅ Write comprehensive tests
✅ Profile regularly
✅ Implement security features
✅ Monitor production apps
✅ Use staged rollouts

Resources

• Testing Guide
• Security & Privacy
• Play Console Help