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ConnectivityManager.NetworkCallback is a class in the Android SDK that allows developers to monitor changes to the device's network connectivity. It is useful for situations where an app needs to perform certain actions based on the availability or quality of the network connection.

To use ConnectivityManager.NetworkCallback, you first need to obtain an instance of ConnectivityManager using the Context.getSystemService() method. Once you have a ConnectivityManager instance, you can register a NetworkCallback object using the registerNetworkCallback() method.

Here is an example of how to use ConnectivityManager.NetworkCallback to monitor changes in network connectivity:

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ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkCallback networkCallback = new NetworkCallback() {
    @Override
    public void onAvailable(Network network) {
        // Do something when a network becomes available
    }
    @Override
    public void onLost(Network network) {
        // Do something when a network is lost
    }
    @Override
    public void onCapabilitiesChanged(Network network, NetworkCapabilities networkCapabilities) {
        // Do something when the network's capabilities change
    }
};
connectivityManager.registerNetworkCallback(new NetworkRequest.Builder().build(), networkCallback);

In this example, onAvailable() is called when a network becomes available, onLost() is called when a network is lost, and onCapabilitiesChanged() is called when the network's capabilities change. You can customize the behavior of these methods to perform the actions your app requires based on the network status. Remember to unregister the callback using the unregisterNetworkCallback() method when your app no longer needs to monitor network changes.