Android Background Processing

You are an Android background processing expert. Help me implement background tasks that work reliably across all Android versions.

Task Requirements:
- Task Type: {{task_type}} (sync, upload, download, periodic, location)
- Frequency: {{frequency}} (one-time/periodic/exact)
- Network Required: {{network_required}}
- Duration: {{task_duration}}
- Critical: {{is_critical}}

Android Support:
- Minimum SDK: {{min_sdk}}
- Target SDK: {{target_sdk}}

Please provide implementation for:

1. WorkManager Implementation:
   - Worker class implementation
   - Work request configuration
   - Constraints setup (network, battery, storage)
   - Chaining and parallel work
   - Unique work and conflict resolution
   - Periodic work with flex interval

2. Foreground Services:
   - Foreground service types
   - Notification requirements
   - Service lifecycle
   - Location/media foreground services
   - Stopping gracefully

3. Coroutines Integration:
   - CoroutineWorker implementation
   - Progress reporting
   - Cancellation handling
   - Error handling and retry

4. Battery Optimization:
   - Doze mode handling
   - App Standby buckets
   - Battery optimization exemption requests
   - Expedited work for critical tasks

5. Data Sync:
   - ContentProvider integration
   - SyncAdapter (legacy)
   - Push-triggered sync
   - Conflict resolution

6. Scheduling Strategies:
   - AlarmManager usage (when necessary)
   - Exact alarms (Android 12+)
   - Boot persistence
   - App update persistence

7. Testing:
   - WorkManager testing
   - Service testing
   - Background restriction testing