Android event for internet connectivity state change [duplicate]

Answer 1

Android Nougat & O (API 24+) - Network State

Changes mades to @darnmason answer (constructor) to make it work on API 24+.

public NetworkStateReceiver(Context context) {
    mListeners =  new ArrayList<>();
    mManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

    IntentFilter intentFilter = new IntentFilter();
    intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
    context.registerReceiver(NetworkStateReceiver.this, intentFilter);

    checkStateChanged();
}