diff --git a/CloudKey/app/src/main/java/com/thankvinci/CloudKey/Fragment/FileManageFragment.java b/CloudKey/app/src/main/java/com/thankvinci/CloudKey/Fragment/FileManageFragment.java
index 39d77c7..a62ebf3 100644
--- a/CloudKey/app/src/main/java/com/thankvinci/CloudKey/Fragment/FileManageFragment.java
+++ b/CloudKey/app/src/main/java/com/thankvinci/CloudKey/Fragment/FileManageFragment.java
@@ -19,6 +19,7 @@ import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.core.app.ActivityCompat;
 import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
 import androidx.recyclerview.widget.RecyclerView;
 import androidx.recyclerview.widget.StaggeredGridLayoutManager;
 
diff --git a/CloudKey/app/src/main/java/com/thankvinci/CloudKey/Fragment/UnzipDialogFragment.java b/CloudKey/app/src/main/java/com/thankvinci/CloudKey/Fragment/UnzipDialogFragment.java
index 4cbb26b..84baa07 100644
--- a/CloudKey/app/src/main/java/com/thankvinci/CloudKey/Fragment/UnzipDialogFragment.java
+++ b/CloudKey/app/src/main/java/com/thankvinci/CloudKey/Fragment/UnzipDialogFragment.java
@@ -5,6 +5,7 @@ import android.os.Build;
 import android.os.Bundle;
 import android.os.Handler;
 import android.util.Log;
+import android.view.KeyEvent;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -62,6 +63,8 @@ public class UnzipDialogFragment extends DialogFragment {
     private String srcFile,desPath,md5,passwd;
     //解压是否成功
     private boolean successful;
+    //当前dialog是否可视
+    private boolean isVisable;
 
     public interface UnzipDialogListener{
         public void onDialogUnzipClicked();
@@ -112,6 +115,7 @@ public class UnzipDialogFragment extends DialogFragment {
 
         fromSQL = false;
         successful = false;
+        isVisable = true;
         try {
             if(!FileUtils.isEncrypted(srcFile)){
                 //当文件不是加密文件时
@@ -189,6 +193,7 @@ public class UnzipDialogFragment extends DialogFragment {
         alertDialog.setCanceledOnTouchOutside(false);
         if (alertDialog != null){
             Button pb = alertDialog.getButton(AlertDialog.BUTTON_POSITIVE);
+            Button nb = alertDialog.getButton(AlertDialog.BUTTON_NEGATIVE);
             pb.setOnClickListener(new View.OnClickListener() {
                 @Override
                 public void onClick(View v) {
@@ -199,13 +204,25 @@ public class UnzipDialogFragment extends DialogFragment {
                     Thread ft = new Thread(new FileThread(fHandler,srcFile,desPath,passwd,FileHandler.FUNCTION_DECOMPRESS));
                     ft.start();
                     progressBar.setVisibility(View.VISIBLE);
-                    Button nb = alertDialog.getButton(AlertDialog.BUTTON_NEGATIVE);
                     nb.setClickable(false);
                     nb.setTextColor(getResources().getColor(R.color.grey_1));
                 }
             });
+            nb.setOnClickListener(new View.OnClickListener() {
+                @Override
+                public void onClick(View v) {
+                    dismiss();
+                }
+            });
         }
     }
+
+    @Override
+    public void onStop() {
+        super.onStop();
+        dismiss();
+    }
+
     public void setFromSQL(boolean fromSQL){
         this.fromSQL = fromSQL;
     }
@@ -265,4 +282,15 @@ public class UnzipDialogFragment extends DialogFragment {
     public FileManageFragment getFMFragment(){
         return fmFragment;
     }
+    public void setVisable(boolean v){
+        this.isVisable = v;
+    }
+    public boolean getVisable(){
+        return isVisable;
+    }
+    public void dismiss(){
+        Toast.makeText(getActivity(),"重写dismiss",Toast.LENGTH_SHORT).show();
+        setVisable(false);
+        super.dismiss();
+    }
 }
diff --git a/CloudKey/app/src/main/java/com/thankvinci/CloudKey/MainActivity.java b/CloudKey/app/src/main/java/com/thankvinci/CloudKey/MainActivity.java
index f5da1e7..1205555 100644
--- a/CloudKey/app/src/main/java/com/thankvinci/CloudKey/MainActivity.java
+++ b/CloudKey/app/src/main/java/com/thankvinci/CloudKey/MainActivity.java
@@ -3,6 +3,7 @@ package com.thankvinci.CloudKey;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.drawerlayout.widget.DrawerLayout;
 import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
 import androidx.navigation.NavController;
 import androidx.navigation.fragment.NavHostFragment;
 import androidx.navigation.ui.AppBarConfiguration;
@@ -17,6 +18,7 @@ import android.widget.Toast;
 
 import com.google.android.material.navigation.NavigationView;
 import com.thankvinci.CloudKey.Fragment.FileManageFragment;
+import com.thankvinci.CloudKey.Fragment.UnzipDialogFragment;
 import com.thankvinci.CloudKey.NetUtils.NetHandler;
 import com.thankvinci.CloudKey.NetUtils.NetThread;
 
@@ -56,6 +58,7 @@ public class MainActivity extends AppCompatActivity {
                 }
             }
         }
+
         return super.onKeyDown(key, event); //只有当当前页面不是fm的根目录时会执行原本的返回操作
     }
 }
\ No newline at end of file
diff --git a/CloudKey/app/src/main/java/com/thankvinci/CloudKey/Utils/FileHandler.java b/CloudKey/app/src/main/java/com/thankvinci/CloudKey/Utils/FileHandler.java
index b0ce31e..61f6aa8 100644
--- a/CloudKey/app/src/main/java/com/thankvinci/CloudKey/Utils/FileHandler.java
+++ b/CloudKey/app/src/main/java/com/thankvinci/CloudKey/Utils/FileHandler.java
@@ -38,8 +38,10 @@ public class FileHandler extends Handler {
         super.handleMessage(msg);
         switch (msg.what){
             case FUNCTION_GET_MD5:
-                ((UnzipDialogFragment)fragment).setMD5(msg.getData().getString("md5"));
-                ((UnzipDialogFragment)fragment).setProgressBar(View.INVISIBLE);
+                if(((UnzipDialogFragment)fragment).getVisable()){
+                    ((UnzipDialogFragment)fragment).setMD5(msg.getData().getString("md5"));
+                    ((UnzipDialogFragment)fragment).setProgressBar(View.INVISIBLE);
+                }
                 break;
             case FUNCTION_ERROR:
                 Toast.makeText(activity,msg.getData().getString("error"),Toast.LENGTH_SHORT).show();
@@ -65,7 +67,6 @@ public class FileHandler extends Handler {
                     Thread nt = new Thread(new NetThread(handler,builder.toString()));
                     nt.start();
                 }
-
                 break;
         }
     }