Doze, App Standby & Background Limits

Copy code// Test your app in Doze:
adb shell dumpsys deviceidle force-idle
// Run your scenario, then check if background work triggered
adb shell dumpsys deviceidle step  // cycle through maintenance windows
adb shell dumpsys deviceidle unforce  // restore normal behavior

Copy codeadb shell am get-standby-bucket com.example.myapp

Copy code// ❌ Won't work when app in background (Android 8+)
startService(Intent(this, MyService::class.java))

// ✅ Use WorkManager for deferrable work
WorkManager.getInstance(this).enqueue(
    OneTimeWorkRequestBuilder<MyWorker>()
        .setConstraints(Constraints.Builder().setRequiredNetworkType(NetworkType.CONNECTED).build())
        .build()
)

// ✅ Use startForegroundService for immediate user-visible work
val intent = Intent(this, ForegroundService::class.java)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    startForegroundService(intent)
} else {
    startService(intent)
}

Copy code<service
    android:name=".UploadService"
    android:foregroundServiceType="dataSync"  <!-- required -->
    android:exported="false" />

Copy codeclass UploadService : Service() {
    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
        val notification = buildNotification()
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
            startForeground(NOTIFICATION_ID, notification, ServiceInfo.FOREGROUND_SERVICE_TYPE_DATA_SYNC)
        } else {
            startForeground(NOTIFICATION_ID, notification)
        }
        // ... do work
        return START_NOT_STICKY
    }
}

Copy code<!-- ❌ No longer delivered to background apps (Android 8+) -->
<receiver android:name=".ConnectivityReceiver">
    <intent-filter>
        <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
    </intent-filter>
</receiver>

Copy code// ✅ Register dynamically (in foreground only)
class MainActivity : AppCompatActivity() {
    private val connectivityReceiver = ConnectivityReceiver()

    override fun onStart() {
        super.onStart()
        registerReceiver(connectivityReceiver, IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION))
    }

    override fun onStop() {
        super.onStop()
        unregisterReceiver(connectivityReceiver)
    }
}

// ✅ Or use WorkManager with NetworkType constraint — handles this automatically