修改了一些问题

cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMPushService.java

@@ -56,7 +56,7 @@ public class CIMPushService extends Service {
     @Override
     public void onCreate() {
         connectorManager = CIMConnectorManager.getManager(this.getApplicationContext());
-        notificationManager = getSystemService(NotificationManager.class);
+        notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
 
             keepAliveReceiver = new KeepAliveBroadcastReceiver();

cim-server-sdk/cim-server-sdk-netty/src/main/java/com/farsunset/cim/sdk/server/coder/WebMessageDecoder.java

@@ -17,7 +17,7 @@ public class WebMessageDecoder extends SimpleChannelInboundHandler<Object> {
 
     private final static String URI = "ws://localhost:%d";
 
-    private static ConcurrentHashMap<String, WebSocketServerHandshaker> handShakerMap = new ConcurrentHashMap<>();
+    private static final ConcurrentHashMap<String, WebSocketServerHandshaker> handShakerMap = new ConcurrentHashMap<>();
 
     private static final Logger LOGGER = LoggerFactory.getLogger(WebMessageDecoder.class);
 

cim-server-sdk/cim-server-sdk-netty/src/main/java/com/farsunset/cim/sdk/server/handler/CIMNioSocketAcceptor.java

@@ -54,8 +54,8 @@ import java.util.concurrent.ConcurrentHashMap;
 public class CIMNioSocketAcceptor{
 	private static final Logger LOGGER = LoggerFactory.getLogger(CIMNioSocketAcceptor.class);
 
-	private HashMap<String, CIMRequestHandler> innerHandlerMap = new HashMap<>();
-    private ConcurrentHashMap<String,Channel> channelGroup = new ConcurrentHashMap<>();
+	private final HashMap<String, CIMRequestHandler> innerHandlerMap = new HashMap<>();
+    private final ConcurrentHashMap<String,Channel> channelGroup = new ConcurrentHashMap<>();
 
 
 	private EventLoopGroup appBossGroup;