src/Notesmaster/app/src/main/java/net/micode/notes/ui/NoteEditActivity.java

@@ -30,6 +30,8 @@ import android.content.SharedPreferences;
 import android.graphics.Paint;
 import android.os.Bundle;
 import android.preference.PreferenceManager;
+import android.text.Editable;
+import android.text.TextWatcher;
 import android.text.Spannable;
 import android.text.SpannableString;
 import android.text.TextUtils;
@@ -91,6 +93,8 @@ public class NoteEditActivity extends AppCompatActivity implements OnClickListen
         public TextView tvAlertDate;
 
         public ImageView ibSetBgColor;
+        
+        public TextView tvCharCount;
     }
 
     private static final Map<Integer, Integer> sBgSelectorBtnsMap = new HashMap<Integer, Integer>();
@@ -312,10 +316,29 @@ public class NoteEditActivity extends AppCompatActivity implements OnClickListen
         mNoteHeaderHolder.tvAlertDate = findViewById(R.id.tv_alert_date);
         mNoteHeaderHolder.ibSetBgColor = findViewById(R.id.btn_set_bg_color);
         mNoteHeaderHolder.ibSetBgColor.setOnClickListener(this);
+        mNoteHeaderHolder.tvCharCount = findViewById(R.id.tv_char_count);
+
         mNoteEditor = findViewById(R.id.note_edit_view);
         mNoteEditorPanel = findViewById(R.id.sv_note_edit);
         mNoteBgColorSelector = findViewById(R.id.note_bg_color_selector);
 
+        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) {
+                if (mNoteHeaderHolder != null && mNoteHeaderHolder.tvCharCount != null) {
+                    mNoteHeaderHolder.tvCharCount.setText(String.valueOf(s.length()) + " 字");
+                }
+            }
+
+            @Override
+            public void afterTextChanged(Editable s) {
+            }
+        });
+
         // 设置背景颜色选择器的点击事件
         for (int id : sBgSelectorBtnsMap.keySet()) {
             ImageView iv = findViewById(id);
@@ -1062,6 +1085,10 @@ public class NoteEditActivity extends AppCompatActivity implements OnClickListen
             mNoteEditor.setText(getHighlightQueryResult(mWorkingNote.getContent(), mUserQuery));
             mEditTextList.setVisibility(View.GONE);
             mNoteEditor.setVisibility(View.VISIBLE);
+            if (mNoteHeaderHolder != null && mNoteHeaderHolder.tvCharCount != null) {
+                mNoteHeaderHolder.tvCharCount.setVisibility(View.VISIBLE);
+                mNoteHeaderHolder.tvCharCount.setText(String.valueOf(mNoteEditor.getText().length()) + " 字");
+            }
         }
     }
 

src/Notesmaster/app/src/main/res/layout/note_edit.xml

@@ -46,13 +46,22 @@
 
             <TextView
                 android:id="@+id/tv_modified_date"
-                android:layout_width="0dp"
+                android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
-                android:layout_weight="1"
                 android:layout_gravity="left|center_vertical"
                 android:layout_marginRight="8dp"
                 android:textAppearance="@style/TextAppearanceSecondaryItem" />
 
+            <TextView
+                android:id="@+id/tv_char_count"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:layout_gravity="center_vertical"
+                android:paddingLeft="5dp"
+                android:text="0 字"
+                android:textAppearance="@style/TextAppearanceSecondaryItem" />
+
             <ImageView
                 android:id="@+id/iv_alert_icon"
                 android:layout_width="wrap_content"