diff --git a/app.apk b/app.apk
index 2cde455..9de2aa0 100644
Binary files a/app.apk and b/app.apk differ
diff --git a/main/AndroidManifest.xml b/main/AndroidManifest.xml
index 7414c78..607bcc4 100644
--- a/main/AndroidManifest.xml
+++ b/main/AndroidManifest.xml
@@ -2,7 +2,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.hty.browser"
     android:versionCode="4"
-    android:versionName="4.30">
+    android:versionName="4.31">
 
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <!-- 查询网络状态权限 -->
diff --git a/main/assets/about.htm b/main/assets/about.htm
index 8be4e15..e379006 100644
--- a/main/assets/about.htm
+++ b/main/assets/about.htm
@@ -23,6 +23,7 @@ p { text-indent:2em; }
 <p><a href="https://stackoverflow.com/questions/3462582/display-the-android-webviews-favicon" target="_blank">获取网页图标</a></p>
 <p><a href="https://www.jianshu.com/p/c9a18050a249" target="_blank">字符串转Bitmap</a></p>
 <h3>更新日志：</h3>
+<h3>V4.31 (2023-04-17)</h3><ol><li>取消自动升级，以免因升级错误引起崩溃。</li></ol>
 <h3>V4.30 (2023-03-23)</h3><ol><li>收藏夹测试 ExpandableListView 控件</li></ol>
 <h3>V4.29 (2023-03-01)</h3><ol><li>收藏夹增加分类。</li><li>收藏夹分类的修改和删除。</li><li>修改导出HTML和CSV方法。</li><li>新建收藏和修改收藏编辑框设置最大行数，避免窗口撑大不完整。</li></ol>
 <h3>V4.28 (2022-11-07)</h3><ol><li>资源探查脚本支持返回多个对象。<br>分类标题增加数量。<br>使用 &lt;details&gt; 代替 &lt;div&gt;，分类可折叠。</li></ol>
diff --git a/main/java/com/hty/browser/FavoriteActivity.java b/main/java/com/hty/browser/FavoriteActivity.java
index a70310d..526ef2f 100644
--- a/main/java/com/hty/browser/FavoriteActivity.java
+++ b/main/java/com/hty/browser/FavoriteActivity.java
@@ -62,7 +62,12 @@ public class FavoriteActivity extends Activity {
         getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN);
         IMM = (InputMethodManager) getApplicationContext().getSystemService(Context.INPUT_METHOD_SERVICE);
         imageButton_clear = (ImageButton) findViewById(R.id.imageButton_clear);
-        imageButton_clear.setOnClickListener(new OnClickListener());
+        imageButton_clear.setOnClickListener(new View.OnClickListener(){
+            @Override
+            public void onClick(View v) {
+                editText.setText("");
+            }
+        });
         imageButton_clear.setVisibility(View.GONE);
         editText = (EditText) findViewById(R.id.editText);
         editText.addTextChangedListener(new EditChangedListener());
@@ -389,17 +394,6 @@ public class FavoriteActivity extends Activity {
         return true;
     }
 
-    class OnClickListener implements View.OnClickListener {
-        @Override
-        public void onClick(View v) {
-            switch (v.getId()) {
-                case R.id.imageButton_clear:
-                    editText.setText("");
-                    break;
-            }
-        }
-    }
-
     class RadioButtonOnClickListener implements View.OnClickListener {
         @Override
         public void onClick(View v) {
diff --git a/main/java/com/hty/browser/FavoriteActivity1.java b/main/java/com/hty/browser/FavoriteActivity1.java
index 62a21cf..beaa2ea 100644
--- a/main/java/com/hty/browser/FavoriteActivity1.java
+++ b/main/java/com/hty/browser/FavoriteActivity1.java
@@ -12,6 +12,8 @@ import android.database.Cursor;
 import android.database.sqlite.SQLiteDatabase;
 import android.net.Uri;
 import android.os.Bundle;
+import android.text.Editable;
+import android.text.TextWatcher;
 import android.util.Log;
 import android.view.ContextMenu;
 import android.view.Menu;
@@ -20,6 +22,7 @@ import android.view.View;
 import android.widget.ArrayAdapter;
 import android.widget.EditText;
 import android.widget.ExpandableListView;
+import android.widget.ImageButton;
 import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.SimpleCursorTreeAdapter;
@@ -36,6 +39,8 @@ import java.lang.reflect.Field;
 import java.util.ArrayList;
 
 public class FavoriteActivity1 extends Activity {
+    EditText editText;
+    ImageButton imageButton_clear;
     ExpandableListView expandableListView;
     int position = 0;
 
@@ -43,6 +48,16 @@ public class FavoriteActivity1 extends Activity {
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_favorite1);
+        editText = (EditText) findViewById(R.id.editText1);
+        editText.addTextChangedListener(new EditChangedListener());
+        imageButton_clear = (ImageButton) findViewById(R.id.imageButton_clear1);
+        imageButton_clear.setOnClickListener(new View.OnClickListener(){
+            @Override
+            public void onClick(View v) {
+                editText.setText("");
+            }
+        });
+        imageButton_clear.setVisibility(View.GONE);
         expandableListView = (ExpandableListView) findViewById(R.id.expandablelistView);
 
         expandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@@ -227,7 +242,6 @@ public class FavoriteActivity1 extends Activity {
     @Override
     public boolean onContextItemSelected(MenuItem item) {
         ExpandableListView.ExpandableListContextMenuInfo menuInfo = (ExpandableListView.ExpandableListContextMenuInfo) item.getMenuInfo();
-        position = expandableListView.getFirstVisiblePosition();
         switch (item.getGroupId()) {
             case 0:
                 final String group_name = ((TextView) menuInfo.targetView.findViewById(R.id.group_name)).getText().toString();
@@ -345,6 +359,7 @@ public class FavoriteActivity1 extends Activity {
                                     int i = db.update(DBHelper.TableName, values, "_id = " + sid, null);
                                     if (i != -1) {
                                         onCreate(null);
+                                        //expandableListView.expandGroup(position);
                                     } else
                                         Toast.makeText(getApplicationContext(), "修改失败", Toast.LENGTH_SHORT).show();
                                     try {
@@ -452,4 +467,24 @@ public class FavoriteActivity1 extends Activity {
         }
     }
 
+    class EditChangedListener implements TextWatcher {
+        @Override
+        public void beforeTextChanged(CharSequence s, int start, int count,int after) {
+
+        }
+        @Override
+        public void onTextChanged(CharSequence s, int start, int before, int count) {
+
+        }
+        @Override
+        public void afterTextChanged(Editable s) {
+            if (s.toString().equals("")) {
+                imageButton_clear.setVisibility(View.GONE);
+            } else {
+                imageButton_clear.setVisibility(View.VISIBLE);
+            }
+            //search(0, s.toString());
+        }
+    }
+
 }
\ No newline at end of file
diff --git a/main/java/com/hty/browser/MainActivity.java b/main/java/com/hty/browser/MainActivity.java
index 27a21fb..c808719 100644
--- a/main/java/com/hty/browser/MainActivity.java
+++ b/main/java/com/hty/browser/MainActivity.java
@@ -111,8 +111,8 @@ public class MainActivity extends Activity {
     InputMethodManager IMM;
     ProgressBar pgb1;
     String urlo = "", HTRE = "", ptitle = "", urln = "";
-    String urlVersion = "https://www.gitlink.org.cn/api/sonichy/HTYBrowser/raw?filepath=version&ref=master";
-    String urlUpdate = "https://www.gitlink.org.cn/api/sonichy/HTYBrowser/raw?filepath=app.apk&ref=master";
+    String url_version = "https://www.gitlink.org.cn/api/sonichy/HTYBrowser/raw?filepath=version&ref=master";
+    String url_update = "https://www.gitlink.org.cn/api/sonichy/HTYBrowser/raw?filepath=app.apk&ref=master";
     CustomViewCallback customViewCallback;
     boolean isFullScreen, isManualCheckUpdate = false;
     static File dir;
@@ -241,7 +241,6 @@ public class MainActivity extends Activity {
                 checkUpdate();
             }
         };
-        new Thread(CU).start();
 
         receiver = new DownloadCompleteReceiver();
         IntentFilter intentFilter = new IntentFilter();
@@ -1171,7 +1170,7 @@ public class MainActivity extends Activity {
         // 添加一个下载任务
         long downloadId = downloadManager.enqueue(request);
         Log.e(Thread.currentThread().getStackTrace()[2] + "", downloadId + "");
-        if(surl == urlUpdate){
+        if (surl == url_update) {
             downloadIdUpdate = downloadId;
         }
     }
@@ -1179,14 +1178,23 @@ public class MainActivity extends Activity {
     void checkUpdate() {
         try {
             String versionL = MainActivity.this.getPackageManager().getPackageInfo(MainActivity.this.getPackageName(), 0).versionName;
-            URL url = new URL(urlVersion);
+            URL url = new URL(url_version);
             HttpURLConnection conn = (HttpURLConnection) url.openConnection();
             //conn.setRequestMethod("GET");
             //if (conn.getResponseCode() == 200) {
             InputStream IS = conn.getInputStream();
             InputStreamReader ISR = new InputStreamReader(IS);
-            BufferedReader bufferReader = new BufferedReader(ISR);
-            String versionS = bufferReader.readLine();
+            BufferedReader BR = new BufferedReader(ISR);
+            String versionS = BR.readLine();
+            if (!versionS.startsWith("{") && !versionS.endsWith("}")) {
+                Looper.prepare();
+                Toast.makeText(getApplicationContext(),  "服务器版本号解析错误：\n" + versionS, Toast.LENGTH_SHORT).show();
+                Looper.myLooper().loop();
+                return;
+            } else {
+                versionS = versionS.replace("{", "");
+                versionS = versionS.replace("}", "");
+            }
             Log.e(Thread.currentThread().getStackTrace()[2] + "", versionS + " > " + versionL + " ?");
             String[] AVersionS = versionS.split("\\.");
             String[] AVersionL = versionL.split("\\.");
@@ -1200,7 +1208,7 @@ public class MainActivity extends Activity {
                 builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                     @Override
                     public void onClick(DialogInterface dialog, int which) {
-                        downloadBySystem(urlUpdate, "", "", "", "HTYBrowser.apk");
+                        downloadBySystem(url_update, "", "", "", "HTYBrowser.apk");
                     }
                 });
                 builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@@ -1212,7 +1220,7 @@ public class MainActivity extends Activity {
                 dialog.show();
                 Looper.myLooper().loop();
             } else {
-                if(isManualCheckUpdate) {
+                if (isManualCheckUpdate) {
                     Looper.prepare();
                     Toast.makeText(getApplicationContext(), "当前版本 " + versionL + " >= 服务器版本 "+ versionS + "，是最新的版本", Toast.LENGTH_SHORT).show();
                     Looper.myLooper().loop();
@@ -1220,10 +1228,9 @@ public class MainActivity extends Activity {
                 Log.e("检查更新: ", "当前版本是最新的版本");
             }
             //}
-        } catch (PackageManager.NameNotFoundException e) {
-            e.printStackTrace();
-        } catch (IOException e) {
+        } catch (Exception e) {
             e.printStackTrace();
+            Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_SHORT).show();
         }
     }
 
diff --git a/version b/version
index 9c1bd41..3ccca22 100644
--- a/version
+++ b/version
@@ -1 +1 @@
-4.30
\ No newline at end of file
+{4.31}
\ No newline at end of file