import com.pusher.client.connection.ConnectionStateChange; //导入依赖的package包/类
public PusherClient(String key) {

        channels = new HashMap<>();

        PusherOptions options = new PusherOptions();
        pusher = new Pusher(key, options);
        pusher.connect(new ConnectionEventListener() {
            @Override
            public void onConnectionStateChange(ConnectionStateChange change) {
                log("State changed from " + change.getPreviousState() + " to " + change.getCurrentState());
            }

            @Override
            public void onError(String message, String code, Exception e) {
                log("Error: " + message + " (" + code + ")");
            }
        }, ConnectionState.ALL);

    }
 

import com.pusher.client.connection.ConnectionStateChange; //导入依赖的package包/类
@Override
public void onConnectionStateChange(final ConnectionStateChange connectionStateChange) {
    final ConnectionState newState = connectionStateChange.getCurrentState();

    final StringBuilder sb = new StringBuilder("State change: ").append(newState.name());
    if (newState == ConnectionState.CONNECTED) {
        sb.append(" (")
                .append(options.isEncrypted() ? "SSL" : "Non SSL")
                .append(")");
    }
    log("P", sb.toString());

    updateUiOnStateChange(newState);

    if (newState == ConnectionState.DISCONNECTED && reconnectOnCompletedDisconnection) {
        reconnectOnCompletedDisconnection = false;
        // We received this update from the previous pusher instance which we tore
        // down to change the SSL option. Now that it is fully disconnected, we call
        // connect on the new instance we replaced it with.
        pusher.connect(this);
    }
}
 

import com.pusher.client.connection.ConnectionStateChange; //导入依赖的package包/类
@Override
public void onConnectionStateChange(ConnectionStateChange change) {

    System.out.println(String.format(
            "[%d] Connection state changed from [%s] to [%s]",
            timestamp(), change.getPreviousState(), change.getCurrentState()));
}
 

import com.pusher.client.connection.ConnectionStateChange; //导入依赖的package包/类
@Override
public void onConnectionStateChange(ConnectionStateChange change) {
    switch (change.getCurrentState()) {
        case CONNECTED:
            connectionListener.opened(new ConnectionEventValue(ConnectionEvent.OPENED));
            break;
        case DISCONNECTED:
            connectionListener.closed(new ConnectionEventValue(ConnectionEvent.CLOSED));
            break;
    }
}