解决“外访与内访互相切换时，切换后不能正常访问”的问题。原因是少关闭了一个数据结构

app/src/main/java/com/pkusz/min_vpn_client/services/MINVpnService.java

@@ -67,18 +67,20 @@ public class MINVpnService extends VpnService implements Handler.Callback{
     public static final String ACTION_DISCONNECT = "com.pkusz.min_vpn_client.STOP";
 
     private Handler mHandler;
-    AtomicReference<VpnPreparationInterface> vpnPreparation = new AtomicReference<>(); // 握手工具类
+    AtomicReference<VpnPreparationInterface> vpnPreparation; // 握手工具类
 
     // 标记是否在运行
     private static boolean isRunning = false;
     // tun文件操作符
     private ParcelFileDescriptor vpnInterface = null;
     // 缓冲队列
-    private ConcurrentLinkedQueue<ByteBuffer> readTunDataQueue;   // 读tun数据放入此队列
-    private ConcurrentLinkedQueue<CPacket> readTunCPackets;       // 读tun数据加工的包放入此队列
+    private ConcurrentLinkedQueue<ByteBuffer> readTunDataQueue;     // 读tun数据放入此队列
+    private ConcurrentLinkedQueue<CPacket> readTunCPackets;         // 读tun数据加工的包放入此队列
 //    private ConcurrentLinkedQueue<CPacket> writeTunCPackets;      // 写tun数据未拆解的包放入此队列
     private ConcurrentLinkedQueue<LpPacket> writeTunLpPackets;      // 写tun数据未拆解的包放入此队列
-    private ConcurrentLinkedQueue<ByteBuffer> writeTunDataQueue;  // 写tun数据放入此队列
+    private ConcurrentLinkedQueue<ByteBuffer> writeTunDataQueue;    // 写tun数据放入此队列
+    // 收发包face
+    private LogicFace face;
     // Java官方提供的并发池
     private ExecutorService executorService;
     // 通信intent
@@ -235,6 +237,7 @@ public class MINVpnService extends VpnService implements Handler.Callback{
             System.out.println("new 4");
             // 3. 开启线程池，进入数据中转阶段
             vpnInterface=connectionInfo.mParcelFileDescriptor;
+            face=connectionInfo.face;
 //            vpnInterface=null;
             setupVPN(connectionInfo,false);
         }
@@ -249,6 +252,8 @@ public class MINVpnService extends VpnService implements Handler.Callback{
                          final boolean isSM4,
                          final String allocatedAddressFromInner,
                          boolean isInner){
+        // 初始化VpnPreparation(非常重要，用于将连接状态通过intent通知给界面)
+        vpnPreparation = new AtomicReference<>();
         Thread netRequestThread = new Thread(() -> {
             if(isInner) { // 内网
                 vpnPreparation.set(new VpnIntranetPreparation(this, vpnServerInfo, sharedSecret,
@@ -441,12 +446,21 @@ public class MINVpnService extends VpnService implements Handler.Callback{
         writeTunDataQueue = null;
         writeTunLpPackets = null;
         ByteBufferPool.clear();
+        // 关闭tun网卡
         try {
             vpnInterface.close();
         } catch (IOException e) {
             e.printStackTrace();
             System.out.println("vpnInterface close error");
         }
+        vpnInterface=null;
+        // 关闭face
+        if(face!=null){
+            face.shutDown();
+            face=null;
+        }
+        // 关闭vpnPreparation
+        vpnPreparation = null;
     }
 
 }