Netty_Android

项目地址：https://github.com/zhangYanGitHub/Netty_Demo

采用netty-4.1.16.Final 于服务器保持长连接进行通讯

主要思路为： 开启一个service 初始化Netty连接

• service 类

  private NetworkReceiver receiver;
      public static final String TAG = NettyService.class.getName();
  
      public NettyService() {
      }
  
      @Override
      public IBinder onBind(Intent intent) {
          // TODO: Return the communication channel to the service.
          throw new UnsupportedOperationException("Not yet implemented");
      }
  
      @Override
      public void onCreate() {
          super.onCreate();
          receiver = new NetworkReceiver();
          IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
          LocalBroadcastManager.getInstance(this).registerReceiver(receiver, filter);
  
      }
  
      @Override
      public int onStartCommand(Intent intent, int flags, int startId) {
          //初始化Netty
          NettyClient.getInstance().setListener(this);
          connect();
          return super.onStartCommand(intent, flags, startId);
      }
  
      @Override
      public void onDestroy() {
          super.onDestroy();
          LocalBroadcastManager.getInstance(this).unregisterReceiver(receiver);
          NettyClient.getInstance().setReconnectNum(0);
          NettyClient.getInstance().disconnect();
      }
  
      private void connect() {
          if (!NettyClient.getInstance().getConnectStatus()) {
              new Thread(new Runnable() {
                  @Override
                  public void run() {
                      NettyClient.getInstance().connect();//连接服务器
                  }
              }).start();
          }
      }
  
      @Override
      public void onMessageResponse(String messageHolder) {
          notifyData(NettyActivity.MSG_FROM_SERVER, messageHolder);
  
      }
  
      private void notifyData(int type, String messageHolder) {
          final Stack<NettyActivity> activities = ActivityManager.getInstance().getActivities();
          for (NettyActivity activity : activities) {
              if (activity == null || activity.isFinishing()) {
                  continue;
              }
              Message message = Message.obtain();
              message.what = type;
              message.obj = messageHolder;
              activity.getHandler().sendMessage(message);
          }
      }
  
      @Override
      public void onServiceStatusConnectChanged(int statusCode) {
          if (statusCode == NettyListener.STATUS_CONNECT_SUCCESS) {
              Log.e(TAG, "connect sucessful");
              sendAuthor();
          } else {
              Log.e(TAG, "connect fail statusCode = " + statusCode);
              notifyData(NettyActivity.MSG_NET_WORK_ERROR, String.valueOf("服务器连接失败"));
          }
  
      }
  
      /**
       * 连接初始化 认证信息
       * 发送认证信息 这个可以根据项目的实际需要数据类型 进行修改
       */
      private void sendAuthor() {
          final Netty_RegisterInfo nettyRegisterInfo = new Netty_RegisterInfo();
          nettyRegisterInfo.setUserId(1);
          nettyRegisterInfo.setUserType(2);
          final NettyBaseFeed<Netty_RegisterInfo> reqRegisterVONettyBaseFeed = new NettyBaseFeed<>();
          reqRegisterVONettyBaseFeed.setCmd(1);
          reqRegisterVONettyBaseFeed.setModule(1);
          reqRegisterVONettyBaseFeed.setData(nettyRegisterInfo);
          NettyClient.getInstance().sendMessage(reqRegisterVONettyBaseFeed, null);
      }
  
      public class NetworkReceiver extends BroadcastReceiver {
          @Override
          public void onReceive(Context context, Intent intent) {
              ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
              NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
              if (activeNetwork != null) { // connected to the internet
                  if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI
                          || activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) {
                      connect();
                      Log.e(TAG, "connecting ...");
                  }
              }
          }
      }
  

• NettyClient类

  public class NettyClient {
  
      private static NettyClient nettyClient = new NettyClient();
  
      private EventLoopGroup group;
  
      private NettyListener listener;
  
      private Channel channel;
  
      private boolean isConnect = false;
  
      private int reconnectNum = Integer.MAX_VALUE;
  
      private long reconnectIntervalTime = 5000;
      public final static String TAG = NettyClient.class.getName();
      private final Gson gson;
      private Bootstrap bootstrap;
  
      public NettyClient() {
          gson = new Gson();
      }
  
      public static NettyClient getInstance() {
          return nettyClient;
      }
  
      public synchronized NettyClient connect() {
          if (!isConnect) {
              group = new NioEventLoopGroup();
              bootstrap = new Bootstrap().group(group)
                      .option(ChannelOption.SO_KEEPALIVE, true)
                      .option(ChannelOption.SO_BACKLOG, 128)
                      .option(ChannelOption.TCP_NODELAY, true)
                      .channel(NioSocketChannel.class)
                      .handler(new NettyClientInitializer(listener));
              try {
                  ChannelFuture future = bootstrap.connect(UrlConstant.SOCKET_HOST, UrlConstant.SOCKET_PORT).sync();
                  if (future != null && future.isSuccess()) {
                      channel = future.channel();
                      isConnect = true;
                  } else {
                      isConnect = false;
                  }
  
  
              } catch (Exception e) {
                  e.printStackTrace();
                  listener.onServiceStatusConnectChanged(NettyListener.STATUS_CONNECT_ERROR);
                  reconnect();
              }
          }
          return this;
      }
  
      public void disconnect() {
          group.shutdownGracefully();
      }
  
      public void reconnect() {
          if (reconnectNum > 0 && !isConnect) {
              reconnectNum--;
              try {
                  Thread.sleep(reconnectIntervalTime);
              } catch (InterruptedException e) {
                  e.printStackTrace();
              }
              disconnect();
              connect();
          } else {
              disconnect();
          }
      }
  
      public Channel getChannel() {
          return channel;
      }
  
      /**
       * 发送消息
       *
       * @param vo  发送消息的Json对象
       * @param futureListener 发送成功与否的监听
       */
      public void sendMessage(NettyBaseFeed vo, FutureListener futureListener) {
          boolean flag = channel != null && isConnect;
          if (!flag) {
              Log.e(TAG, "------尚未连接");
              return;
          }
          final String s = gson.toJson(vo);
          if (futureListener == null) {
              channel.writeAndFlush(s).addListener(new FutureListener() {
  
                  @Override
                  public void success() {
                      Log.e(TAG, "发送成功--->" + s);
                  }
  
                  @Override
                  public void error() {
                      Log.e(TAG, "发送失败--->" + s);
                  }
              });
          } else {
              channel.writeAndFlush(s).addListener(futureListener);
          }
      }
  
      /**
       * 设置重连次数
       *
       * @param reconnectNum 重连次数
       */
      public void setReconnectNum(int reconnectNum) {
          this.reconnectNum = reconnectNum;
      }
  
      /**
       * 设置重连时间间隔
       *
       * @param reconnectIntervalTime 时间间隔
       */
      public void setReconnectIntervalTime(long reconnectIntervalTime) {
          this.reconnectIntervalTime = reconnectIntervalTime;
      }
  
      public boolean getConnectStatus() {
          return isConnect;
      }
  
      /**
       * 设置连接状态
       *
       * @param status
       */
      public void setConnectStatus(boolean status) {
          this.isConnect = status;
      }
  
      public void setListener(NettyListener listener) {
          if (listener == null) {
              throw new IllegalArgumentException("listener == null ");
          }
          this.listener = listener;
      }
  
  
  }
  

然后发送认证数据至服务器

• 接收服务器的消息 从NettyClientHandler的回调方法channelRead0 这里开始 调用至service之后再遍历NettyActivity的子类 通过主线程的Handler 分发至主线程

  public class NettyClientHandler extends SimpleChannelInboundHandler<String> {
      private static final String TAG = NettyClientHandler.class.getName();
      private NettyListener listener;
  
      public NettyClientHandler(NettyListener listener) {
          this.listener = listener;
      }
  
      @Override
      public void channelActive(ChannelHandlerContext ctx) throws Exception {
          NettyClient.getInstance().setConnectStatus(true);
          listener.onServiceStatusConnectChanged(NettyListener.STATUS_CONNECT_SUCCESS);
      }
  
      @Override
      public void channelInactive(ChannelHandlerContext ctx) throws Exception {
          NettyClient.getInstance().setConnectStatus(false);
          listener.onServiceStatusConnectChanged(NettyListener.STATUS_CONNECT_CLOSED);
          NettyClient.getInstance().reconnect();
      }
  
      @Override
      protected void channelRead0(ChannelHandlerContext channelHandlerContext, String byteBuf) throws Exception {
          Log.e(TAG, "thread == " + Thread.currentThread().getName());
          Log.e(TAG, "来自服务器的消息 ====》" + byteBuf);
          listener.onMessageResponse(byteBuf);
  
      }
  

• 主线程发送消息

   NettyClient.getInstance().sendMessage(baseFeed, null);
  

• 注意 解码器和编码器 要与服务器保持一致