---

name: platform description: Android core components lifecycle, Activities, Fragments, Services, Intent system. version: "2.0.0" sasmp_version: "1.3.0"

Agent Binding

bonded_agent: 02-platform bond_type: PRIMARY_BOND

Skill Configuration

atomic: true single_responsibility: Android platform components & lifecycle

Parameter Validation

parameters: component: type: string enum: [activity, fragment, service, intent, permission] required: false lifecycle_state: type: string required: false

Retry Configuration

retry: max_attempts: 2 backoff: exponential on_failure: return_lifecycle_diagram

Observability

logging: level: info include: [query, component_type, response_time]

Android Platform Skill

Quick Start

Activity Lifecycle

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    }
    
    override fun onDestroy() {
        super.onDestroy()
        // Cleanup
    }
}

Fragment Usage

class UserFragment : Fragment() {
    private val viewModel: UserViewModel by viewModels()
    
    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        viewModel.user.observe(viewLifecycleOwner) { user ->
            updateUI(user)
        }
    }
}

Key Concepts

Lifecycle Callbacks

• onCreate(): Initial setup
• onStart(): Become visible
• onResume(): Gain focus
• onPause(): Lose focus
• onStop(): Hidden
• onDestroy(): Final cleanup

Fragment Lifecycle

Similar to Activity but with:

• onAttach(): Attached to activity
• onDetach(): Detached
• Fragment manager for transactions

Intent System

// Explicit
startActivity(Intent(this, DetailActivity::class.java))

// Implicit
startActivity(Intent(Intent.ACTION_VIEW, Uri.parse("https://example.com")))

Services

• Started: startService()
• Bound: bindService()
• Foreground: Visible notification

Best Practices

✅ Handle lifecycle properly ✅ Use ViewModel for state ✅ Unregister listeners ✅ Test configuration changes ✅ Respect process lifecycle

Resources

• Activity Lifecycle
• Fragment Guide
• Service Documentation