diff --git a/cim-client-sdk/cim-android-sdk/pom.xml b/cim-client-sdk/cim-android-sdk/pom.xml
index a45c8ae..0153197 100755
--- a/cim-client-sdk/cim-android-sdk/pom.xml
+++ b/cim-client-sdk/cim-android-sdk/pom.xml
@@ -6,7 +6,7 @@
 
     <groupId>com.farsunset</groupId>
     <artifactId>cim-android-sdk</artifactId>
-    <version>4.2.7</version>
+    <version>4.2.8</version>
     <packaging>jar</packaging>
 
     <name>${project.groupId}:${project.artifactId}</name>
diff --git a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMCacheManager.java b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMCacheManager.java
index f4d4473..43adefa 100644
--- a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMCacheManager.java
+++ b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMCacheManager.java
@@ -46,6 +46,10 @@ class CIMCacheManager {
 
     public static final String KEY_NTC_CHANNEL_NAME = "KEY_NTC_CHANNEL_NAME";
 
+    public static final String KEY_NTC_CHANNEL_MESSAGE = "KEY_NTC_CHANNEL_MESSAGE";
+
+    public static final String KEY_NTC_CHANNEL_ICON = "KEY_NTC_CHANNEL_ICON";
+
 
     public static final String CONTENT_URI = "content://%s.cim.provider";
 
diff --git a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMConnectorManager.java b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMConnectManager.java
similarity index 86%
rename from cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMConnectorManager.java
rename to cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMConnectManager.java
index 630a9a1..c6bef22 100644
--- a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMConnectorManager.java
+++ b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMConnectManager.java
@@ -26,6 +26,7 @@ import android.content.Intent;
 import android.os.Handler;
 import com.farsunset.cim.sdk.android.coder.ClientMessageDecoder;
 import com.farsunset.cim.sdk.android.coder.ClientMessageEncoder;
+import com.farsunset.cim.sdk.android.constant.BundleKey;
 import com.farsunset.cim.sdk.android.constant.CIMConstant;
 import com.farsunset.cim.sdk.android.constant.IntentAction;
 import com.farsunset.cim.sdk.android.logger.CIMLogger;
@@ -35,18 +36,18 @@ import java.io.IOException;
 import java.net.ConnectException;
 import java.net.InetSocketAddress;
 import java.net.SocketTimeoutException;
+import java.net.UnknownHostException;
 import java.nio.ByteBuffer;
 import java.nio.channels.SocketChannel;
 import java.util.Random;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
+import java.util.concurrent.atomic.AtomicBoolean;
 
 /*
  * 连接服务端管理，cim核心处理类，管理连接，以及消息处理
  */
-class CIMConnectorManager {
-
-    private static CIMConnectorManager manager;
+class CIMConnectManager {
 
     private static final int READ_BUFFER_SIZE = 2048;
 
@@ -76,20 +77,12 @@ class CIMConnectorManager {
 
     private final Random random = new Random();
 
-    private CIMConnectorManager(Context context) {
+    private final AtomicBoolean connecting = new AtomicBoolean(false);
+
+    public CIMConnectManager(Context context) {
         this.context = context;
     }
 
-    public static synchronized CIMConnectorManager getManager(Context context) {
-
-        if (manager == null) {
-            manager = new CIMConnectorManager(context);
-        }
-
-        return manager;
-
-    }
-
     public void connect(final String host, final int port) {
 
         if (!CIMPushManager.isNetworkConnected(context)) {
@@ -102,7 +95,7 @@ class CIMConnectorManager {
             return;
         }
 
-        if (isConnected()) {
+        if (isConnected() || connecting.get()) {
             return;
         }
 
@@ -118,6 +111,8 @@ class CIMConnectorManager {
 
             try {
 
+                connecting.set(true);
+
                 socketChannel = SocketChannel.open();
                 socketChannel.configureBlocking(true);
                 socketChannel.socket().setTcpNoDelay(true);
@@ -129,6 +124,8 @@ class CIMConnectorManager {
 
                 handleConnectedEvent();
 
+                connecting.set(false);
+
                 /*
                  *开始读取来自服务端的消息，先读取3个字节的消息头
                  */
@@ -141,10 +138,12 @@ class CIMConnectorManager {
                  */
                 close();
 
-            } catch (ConnectException | SocketTimeoutException ignore) {
-                handleConnectAbortedEvent();
-            } catch (IOException ignore) {
+            } catch (ConnectException | SocketTimeoutException | UnknownHostException exception) {
+                handleConnectFailedEvent(exception);
+            } catch (IOException exception) {
                 handleDisconnectedEvent();
+            }finally {
+                connecting.set(false);
             }
         });
     }
@@ -155,12 +154,7 @@ class CIMConnectorManager {
             return;
         }
 
-        try {
-            socketChannel.close();
-        } catch (IOException ignore) {
-        } finally {
-            this.onSessionClosed();
-        }
+        this.closeForce();
     }
 
     public boolean isConnected() {
@@ -200,6 +194,15 @@ class CIMConnectorManager {
 
     }
 
+    private void closeForce(){
+        try {
+            socketChannel.close();
+        } catch (IOException ignore) {
+        } finally {
+            this.onSessionClosed();
+        }
+    }
+
 
     private void onSessionCreated() {
         LOGGER.sessionCreated(socketChannel);
@@ -270,27 +273,36 @@ class CIMConnectorManager {
     private final Handler idleHandler = new Handler() {
         @Override
         public void handleMessage(android.os.Message m) {
-            workerExecutor.execute(CIMConnectorManager.this::onSessionIdle);
+            workerExecutor.execute(CIMConnectManager.this::onSessionIdle);
         }
     };
 
     private void handleDisconnectedEvent() {
-        close();
+        closeForce();
     }
 
-    private void handleConnectAbortedEvent() {
+    private void handleConnectFailedEvent(Exception exception) {
 
-        /*
-         * 随机3-10秒后重连
-         */
-        long interval = 3000L + random.nextInt(7001) ;
+        long retryAfter;
 
-        LOGGER.connectFailure(interval);
+        if (exception instanceof UnknownHostException){
+            /*
+             * 通常是网络由WIFI切换为移动网出现这个异常
+             */
+            retryAfter = 3000L;
+        }else {
+            /*
+             * 随机3-10秒后重连
+             */
+            retryAfter = 3000L + random.nextInt(7001) ;
+        }
+
+        LOGGER.connectFailure(retryAfter);
 
         Intent intent = new Intent();
         intent.setPackage(context.getPackageName());
         intent.setAction(IntentAction.ACTION_CONNECT_FAILED);
-        intent.putExtra("interval", interval);
+        intent.putExtra(BundleKey.KEY_RECONNECT_AFTER, retryAfter);
         context.sendBroadcast(intent);
 
     }
diff --git a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMEventBroadcastReceiver.java b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMEventBroadcastReceiver.java
index 67a2ed9..7905791 100644
--- a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMEventBroadcastReceiver.java
+++ b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMEventBroadcastReceiver.java
@@ -77,7 +77,7 @@ public abstract class CIMEventBroadcastReceiver extends BroadcastReceiver {
          * cim连接服务器失败事件
          */
         if (IntentAction.ACTION_CONNECT_FAILED.equals(action)) {
-            long interval = intent.getLongExtra("interval", CIMConstant.RECONNECT_INTERVAL_TIME);
+            long interval = intent.getLongExtra(BundleKey.KEY_RECONNECT_AFTER, CIMConstant.RECONNECT_INTERVAL_TIME);
             onInnerConnectFailed(interval);
         }
 
@@ -126,22 +126,16 @@ public abstract class CIMEventBroadcastReceiver extends BroadcastReceiver {
 
     private void onInnerConnectionClosed() {
         CIMCacheManager.putBoolean(context, CIMCacheManager.KEY_CIM_CONNECTION_STATE, false);
-
-        if (CIMPushManager.isNetworkConnected(context)) {
-            connect(0);
-        }
-
+        connect(0L);
         onConnectionClosed();
     }
 
     private void onInnerConnectFailed(long interval) {
 
-        if (CIMPushManager.isNetworkConnected(context)) {
+        onConnectFailed();
 
-            onConnectFailed();
+        connect(interval);
 
-            connect(interval);
-        }
     }
 
     private void onInnerConnectFinished() {
@@ -152,11 +146,6 @@ public abstract class CIMEventBroadcastReceiver extends BroadcastReceiver {
     }
 
     private void onDevicesNetworkChanged() {
-
-        if (CIMPushManager.isNetworkConnected(context)) {
-            connect(0);
-        }
-
         onNetworkChanged();
     }
 
diff --git a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMPushService.java b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMPushService.java
index c155f1f..6d8bd1b 100644
--- a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMPushService.java
+++ b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMPushService.java
@@ -53,7 +53,8 @@ public class CIMPushService extends Service {
 
     private static final int NOTIFICATION_ID = Integer.MAX_VALUE;
 
-    private CIMConnectorManager connectorManager;
+    private CIMConnectManager connectManager;
+
     private KeepAliveBroadcastReceiver keepAliveReceiver;
     private ConnectivityManager connectivityManager;
     private NotificationManager notificationManager;
@@ -62,7 +63,7 @@ public class CIMPushService extends Service {
     @Override
     public void onCreate() {
 
-        connectorManager = CIMConnectorManager.getManager(this.getApplicationContext());
+        connectManager = new CIMConnectManager(this);
 
         notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
 
@@ -84,6 +85,7 @@ public class CIMPushService extends Service {
         @Override
         public void onAvailable(Network network) {
             sendBroadcast(new Intent(IntentAction.ACTION_NETWORK_CHANGED));
+            handleKeepAlive();
         }
 
         @Override
@@ -125,11 +127,11 @@ public class CIMPushService extends Service {
         }
 
         if (ServiceAction.ACTION_SEND_REQUEST_BODY.equals(action)) {
-            connectorManager.send((SentBody) newIntent.getSerializableExtra(BundleKey.KEY_SEND_BODY));
+            connectManager.send((SentBody) newIntent.getSerializableExtra(BundleKey.KEY_SEND_BODY));
         }
 
         if (ServiceAction.ACTION_CLOSE_CIM_CONNECTION.equals(action)) {
-            connectorManager.close();
+            connectManager.close();
         }
 
         if (ServiceAction.ACTION_ACTIVATE_PUSH_SERVICE.equals(action)) {
@@ -137,12 +139,12 @@ public class CIMPushService extends Service {
         }
 
         if (ServiceAction.ACTION_DESTROY_CIM_SERVICE.equals(action)) {
-            connectorManager.close();
+            connectManager.close();
             this.stopSelf();
         }
 
         if (ServiceAction.ACTION_CIM_CONNECTION_PONG.equals(action)) {
-            connectorManager.send(Pong.getInstance());
+            connectManager.send(Pong.getInstance());
         }
 
         if (ServiceAction.ACTION_SET_LOGGER_EATABLE.equals(action)) {
@@ -195,7 +197,7 @@ public class CIMPushService extends Service {
             return;
         }
 
-        connectorManager.connect(host, port);
+        connectManager.connect(host, port);
 
     }
 
@@ -203,8 +205,8 @@ public class CIMPushService extends Service {
 
         CIMLogger.getLogger().connectState(true, CIMPushManager.isStopped(this), CIMPushManager.isDestroyed(this));
 
-        if (connectorManager.isConnected()) {
-            connectorManager.pong();
+        if (connectManager.isConnected()) {
+            connectManager.pong();
             return;
         }
 
@@ -252,9 +254,14 @@ public class CIMPushService extends Service {
 
 
         if (notificationManager.getNotificationChannel(PERSIST_NTC_CHANNEL_ID) != null) {
-            startForeground(NOTIFICATION_ID,  new Notification.Builder(this,PERSIST_NTC_CHANNEL_ID)
-                    .setContentTitle(CIMCacheManager.getString(this,CIMCacheManager.KEY_NTC_CHANNEL_NAME))
-                    .build());
+
+            int icon = CIMCacheManager.getInt(this,CIMCacheManager.KEY_NTC_CHANNEL_ICON);
+            String title = CIMCacheManager.getString(this,CIMCacheManager.KEY_NTC_CHANNEL_NAME);
+            String message = CIMCacheManager.getString(this,CIMCacheManager.KEY_NTC_CHANNEL_MESSAGE);
+
+            Notification notification = makeNotification(PERSIST_NTC_CHANNEL_ID,icon,title,message);
+
+            startForeground(NOTIFICATION_ID,  notification);
             return;
         }
 
@@ -267,9 +274,9 @@ public class CIMPushService extends Service {
             notificationManager.createNotificationChannel(channel);
         }
 
-        startForeground(NOTIFICATION_ID,  new Notification.Builder(this,TRANSIENT_NTC_CHANNEL_ID)
-                .setContentTitle(CIMPushService.class.getSimpleName())
-                .build());
+        Notification notification = makeNotification(TRANSIENT_NTC_CHANNEL_ID,0,CIMPushService.class.getSimpleName(),null);
+
+        startForeground(NOTIFICATION_ID,  notification);
 
     }
 
@@ -277,6 +284,8 @@ public class CIMPushService extends Service {
     private void createPersistNotification(String channelName ,String message,int icon) {
 
         CIMCacheManager.putString(this,CIMCacheManager.KEY_NTC_CHANNEL_NAME,channelName);
+        CIMCacheManager.putString(this,CIMCacheManager.KEY_NTC_CHANNEL_MESSAGE,message);
+        CIMCacheManager.putInt(this,CIMCacheManager.KEY_NTC_CHANNEL_ICON,icon);
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O && notificationManager.getNotificationChannel(PERSIST_NTC_CHANNEL_ID) == null) {
             NotificationChannel channel = new NotificationChannel(PERSIST_NTC_CHANNEL_ID,channelName, NotificationManager.IMPORTANCE_DEFAULT);
@@ -287,26 +296,40 @@ public class CIMPushService extends Service {
             notificationManager.createNotificationChannel(channel);
         }
 
-        Intent intent = new Intent(Intent.ACTION_MAIN);
-        intent.addFlags(Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT);
-        intent.setPackage(getPackageName());
+        Notification notification = makeNotification(PERSIST_NTC_CHANNEL_ID,icon,channelName,message);
+
+        startForeground(NOTIFICATION_ID,notification);
+    }
+
+
+    private Notification makeNotification(String channel,int icon,String title,String message){
 
         Notification.Builder builder;
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
-            builder = new Notification.Builder(this,PERSIST_NTC_CHANNEL_ID);
+            builder = new Notification.Builder(this,channel);
         }else {
             builder = new Notification.Builder(this);
         }
 
         builder.setAutoCancel(false)
                 .setOngoing(false)
-                .setSmallIcon(icon)
                 .setWhen(System.currentTimeMillis())
-                .setContentIntent(PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_IMMUTABLE))
-                .setContentTitle(channelName)
+                .setContentIntent(getPendingIntent())
+                .setContentTitle(title)
                 .setContentText(message);
 
-        startForeground(NOTIFICATION_ID, builder.build());
+        if (icon > 0){
+            builder.setSmallIcon(icon);
+        }
+
+        return builder.build();
+    }
+
+    private PendingIntent getPendingIntent(){
+        Intent intent = new Intent(Intent.ACTION_MAIN);
+        intent.addFlags(Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT);
+        intent.setPackage(getPackageName());
+        return PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_IMMUTABLE);
     }
 
     private class KeepAliveBroadcastReceiver extends BroadcastReceiver {
diff --git a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/constant/BundleKey.java b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/constant/BundleKey.java
index 6476c86..bc3151b 100644
--- a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/constant/BundleKey.java
+++ b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/constant/BundleKey.java
@@ -35,4 +35,6 @@ public interface BundleKey {
 
     String KEY_NOTIFICATION_ICON = "KEY_NOTIFICATION_ICON";
 
+    String KEY_RECONNECT_AFTER = "KEY_RECONNECT_AFTER";
+
 }
diff --git a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/constant/CIMConstant.java b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/constant/CIMConstant.java
index 582f1fe..98514cb 100644
--- a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/constant/CIMConstant.java
+++ b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/constant/CIMConstant.java
@@ -23,7 +23,7 @@ package com.farsunset.cim.sdk.android.constant;
 
 public interface CIMConstant {
 
-    long RECONNECT_INTERVAL_TIME = 5 * 1000;
+    long RECONNECT_INTERVAL_TIME = 5000L;
 
     /*
      * 消息头长度为3个字节，第一个字节为消息类型，第二，第三字节 转换int后为消息长度
diff --git a/cim-use-examples/cim-client-android/app/build.gradle b/cim-use-examples/cim-client-android/app/build.gradle
index 378c9e4..408bd3b 100644
--- a/cim-use-examples/cim-client-android/app/build.gradle
+++ b/cim-use-examples/cim-client-android/app/build.gradle
@@ -34,7 +34,7 @@ android {
 }
 
 dependencies {
-    implementation "com.farsunset:cim-android-sdk:4.2.7"
+    implementation "com.farsunset:cim-android-sdk:4.2.8"
     implementation 'androidx.appcompat:appcompat:1.2.0'
     implementation 'com.google.android.material:material:1.2.1'
     implementation 'androidx.annotation:annotation:1.1.0'