NetworkStateObserverImpl

All Implemented Interfaces:

com.appsflyer.internal.network.NetworkStateObserver
```
public final class NetworkStateObserverImpl
 implements NetworkStateObserver
                    
```
Observes device connectivity and notifies registered listeners on online/offline transitions.
Platform-specific observation is encapsulated behind ConnectivityStrategy (Strategy pattern). A concrete strategy is chosen once in createStrategy based on the device API level:
- API 24+: NetworkCallbackStrategy — uses ConnectivityManager.registerDefaultNetworkCallback
- API < 24: BroadcastReceiverStrategy — listens for ConnectivityManager.CONNECTIVITY_ACTION
- isOnline reads a @Volatile field — safe from any thread without locking.
- handleConnectivityChange is @Synchronized to serialize state transitions, preventing interleaved or out-of-order listener notifications from concurrent callbacks.
- CopyOnWriteArrayList for listeners — optimized for frequent iteration with rare mutation.
start → creates and activates the strategy → stop tears it down. Both are idempotent, guarded by an AtomicBoolean.

Constructor Summary

Constructors
Constructor	Description
`NetworkStateObserverImpl(Context appContext, ConnectivityManager connectivityManagerOverride)`
`NetworkStateObserverImpl(Context appContext)`

Method Summary

Modifier and Type	Method	Description
`Boolean`	`isOnline()`	Returns the current connectivity state.
`Unit`	`start()`	Begins observing connectivity changes.
`Unit`	`stop()`	Stops observing and releases all system callbacks/receivers.
`Unit`	`addListener(NetworkStateListener listener)`
`Unit`	`removeListener(NetworkStateListener listener)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - NetworkStateObserverImpl
```
NetworkStateObserverImpl(Context appContext, ConnectivityManager connectivityManagerOverride)
```
  - NetworkStateObserverImpl
```
NetworkStateObserverImpl(Context appContext)
```
- Method Detail
  - isOnline
```
 Boolean isOnline()
```
    Returns the current connectivity state. After start is called, this value is kept up-to-date reactively.
  - start
```
 Unit start()
```
    Begins observing connectivity changes. Idempotent — subsequent calls are no-ops. Must be paired with stop to prevent resource leaks.
  - stop
```
 Unit stop()
```
    Stops observing and releases all system callbacks/receivers. Idempotent — safe to call even if not started.
  - addListener
```
 Unit addListener(NetworkStateListener listener)
```
  - removeListener
```
 Unit removeListener(NetworkStateListener listener)
```