diff --git a/src/ui/NoteEditActivity.java b/src/ui/NoteEditActivity.java
index 3ce63a7..6119667 100644
--- a/src/ui/NoteEditActivity.java
+++ b/src/ui/NoteEditActivity.java
@@ -35,6 +35,8 @@ import android.text.SpannableString;
 import android.text.TextUtils;
 import android.text.format.DateUtils;
 import android.text.style.BackgroundColorSpan;
+import android.text.TextWatcher;
+import android.text.Editable;
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.Menu;
@@ -73,7 +75,7 @@ import java.util.regex.Pattern;
 
 
 public class NoteEditActivity extends Activity implements OnClickListener,
-        NoteSettingChangedListener, OnTextViewChangeListener {
+        NoteSettingChangedListener, OnTextViewChangeListener,OnSelectionChangeListener {
     private class HeadViewHolder {//头视图持有者类？？？
         public TextView tvModified;//文本修改
 
@@ -82,6 +84,7 @@ public class NoteEditActivity extends Activity implements OnClickListener,
         public TextView tvAlertDate;//文本提醒日期？
 
         public ImageView ibSetBgColor;//设置背景颜色图像视图
+        public TextView tvCharNum;//新增字符数显示控件
     }
 
     private static final Map<Integer, Integer> sBgSelectorBtnsMap = new HashMap<Integer, Integer>();//背景颜色选择按钮映射
@@ -128,7 +131,7 @@ public class NoteEditActivity extends Activity implements OnClickListener,
 
     private View mFontSizeSelector;
 
-    private EditText mNoteEditor;
+    private NoteEditText mNoteEditor;
 
     private View mNoteEditorPanel;
 
@@ -148,6 +151,28 @@ public class NoteEditActivity extends Activity implements OnClickListener,
 
     private String mUserQuery;
     private Pattern mPattern;
+    //新增字符统计方法，排除空白字符
+    //计算可见字符数，排除空白字符
+    private int calcVisibleCharCount(CharSequence s) {
+        if (s == null) return 0;
+        String filtered = s.toString().replaceAll("\\s+", "");
+        return filtered.length();
+    }
+    //根据选区更新字符统计显示
+    private void updateCharNumForSelection(CharSequence text, int selStart, int selEnd) {
+        if (text == null) {
+            mNoteHeaderHolder.tvCharNum.setText("字符数：0");
+            return;
+        }
+        if (selStart == selEnd) {
+            mNoteHeaderHolder.tvCharNum.setText("字符数：" + calcVisibleCharCount(text));
+        } else {
+            int min = Math.min(selStart, selEnd);
+            int max = Math.max(selStart, selEnd);
+            CharSequence sub = text.subSequence(min, max);
+            mNoteHeaderHolder.tvCharNum.setText("字符数：" + calcVisibleCharCount(sub));
+        }
+    }
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {//创建活动时调用
@@ -371,7 +396,28 @@ public class NoteEditActivity extends Activity implements OnClickListener,
         mNoteHeaderHolder.tvAlertDate = (TextView) findViewById(R.id.tv_alert_date);
         mNoteHeaderHolder.ibSetBgColor = (ImageView) findViewById(R.id.btn_set_bg_color);
         mNoteHeaderHolder.ibSetBgColor.setOnClickListener(this);
-        mNoteEditor = (EditText) findViewById(R.id.note_edit_view);
+        mNoteHeaderHolder.tvCharNum=(TextView)findViewById(R.id.tv_char_num);//将tvCharNum绑定到TextView
+        mNoteEditor = (NoteEditText) findViewById(R.id.note_edit_view);
+        // 注册选区变化监听
+        mNoteEditor.setOnSelectionChangeListener(this);
+        //设置文本监听（统计时排除空白字符）
+        mNoteEditor.addTextChangedListener(new 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) {
+                int displayCount = calcVisibleCharCount(s);
+                mNoteHeaderHolder.tvCharNum.setText("字符数：" + displayCount);
+            }
+
+            @Override
+            public void afterTextChanged(Editable s) {
+            }
+        });
+        mNoteHeaderHolder.tvCharNum.setText("字符数：" + calcVisibleCharCount(mNoteEditor.getText()));
+
+
         mNoteEditorPanel = findViewById(R.id.sv_note_edit);
         mNoteBgColorSelector = findViewById(R.id.note_bg_color_selector);
         for (int id : sBgSelectorBtnsMap.keySet()) {
@@ -704,7 +750,10 @@ public class NoteEditActivity extends Activity implements OnClickListener,
             }
         }
         mEditTextList.addView(getListItem("", index));//添加一个空列表项
-        mEditTextList.getChildAt(index).findViewById(R.id.et_edit_text).requestFocus();//将焦点自动切换到新添加的空列表项的编辑框
+        View focused = mEditTextList.getChildAt(index);
+        focused.findViewById(R.id.et_edit_text).requestFocus();
+        // 更新字符统计，显示整条便签的字符数
+        mNoteHeaderHolder.tvCharNum.setText("字符数：" + calcVisibleCharCount(text));
 
         mNoteEditor.setVisibility(View.GONE);//隐藏编辑框
         mEditTextList.setVisibility(View.VISIBLE);
@@ -753,10 +802,30 @@ public class NoteEditActivity extends Activity implements OnClickListener,
         }
 
         edit.setOnTextViewChangeListener(this);
+         //新增选区变化回调接口设置
+        edit.setOnSelectionChangeListener(this);
         edit.setIndex(index);
         edit.setText(getHighlightQueryResult(item, mUserQuery));
         return view;
     }
+    //新增选区变化回调接口实现
+
+    @Override
+    public void onSelectionChanged(int index, int selStart, int selEnd) {
+        if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) {
+            //列表模式下的选区变化事件
+            if (index >= 0 && index < mEditTextList.getChildCount()) {
+                //如果索引在范围内
+                View view = mEditTextList.getChildAt(index);
+                NoteEditText edit = (NoteEditText) view.findViewById(R.id.et_edit_text);
+                updateCharNumForSelection(edit.getText(), selStart, selEnd);
+            }
+        } else {
+            if (mNoteEditor != null && mNoteEditor.isFocused()) {
+                updateCharNumForSelection(mNoteEditor.getText(), selStart, selEnd);
+            }
+        }
+    }
 
     public void onTextChange(int index, boolean hasText) {// 列表项文本变化事件
         if (index >= mEditTextList.getChildCount()) {//检查索引是否超出范围
@@ -781,6 +850,8 @@ public class NoteEditActivity extends Activity implements OnClickListener,
             mNoteEditor.setText(getHighlightQueryResult(mWorkingNote.getContent(), mUserQuery));
             mEditTextList.setVisibility(View.GONE);
             mNoteEditor.setVisibility(View.VISIBLE);
+            // 更新字符统计为整条便签字符数
+            mNoteHeaderHolder.tvCharNum.setText("字符数：" + calcVisibleCharCount(mWorkingNote.getContent()));
         }
     }
 
diff --git a/src/ui/NoteEditText.java b/src/ui/NoteEditText.java
index e0fe20a..b2ff0a0 100644
--- a/src/ui/NoteEditText.java
+++ b/src/ui/NoteEditText.java
@@ -86,6 +86,8 @@ public class NoteEditText extends EditText {
     }
 
     private OnTextViewChangeListener mOnTextViewChangeListener;       // 文本变化监听器实例
+    //新增选区变化回调接口
+    private OnSelectionChangeListener mOnSelectionChangeListener;
 
     /**
      * 构造函数，创建NoteEditText实例
@@ -111,6 +113,10 @@ public class NoteEditText extends EditText {
     public void setOnTextViewChangeListener(OnTextViewChangeListener listener) {
         mOnTextViewChangeListener = listener;
     }
+    //新增选区变化回调接口设置方法
+    public void setOnSelectionChangeListener(OnSelectionChangeListener listener) {
+        mOnSelectionChangeListener = listener;
+    }
 
     /**
      * 构造函数，从XML布局创建NoteEditText实例
@@ -285,4 +291,19 @@ public class NoteEditText extends EditText {
         }
         super.onCreateContextMenu(menu);
     }
+
+    //新增选区变化回调接口实现
+    @Override
+    protected void onSelectionChanged(int selStart, int selEnd) {
+        super.onSelectionChanged(selStart, selEnd);
+        if (mOnSelectionChangeListener != null) {
+            mOnSelectionChangeListener.onSelectionChanged(mIndex, selStart, selEnd);
+        }
+    }
 }
+
+
+// 新增选区变化回调接口
+interface OnSelectionChangeListener {
+    void onSelectionChanged(int index, int selStart, int selEnd);
+}
\ No newline at end of file