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关于设置私密模式与退出私密模式的逻辑部分的相关代码，以及不同状况下的按钮显示内容

1.txt

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-123

doc/mod.txt

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+1234

model/add dir.txt

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+add dir

other/other.txt

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+other

src/creat files.txt

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+create files

src/所有代码.txt

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+Menu-note-list
+<!--    背景图功能  -->
+    <item
+        android:id="@+id/menu_a1"
+        android:title="@string/menu_a1"/>
+    <item
+        android:id="@+id/menu_a2"
+        android:title="@string/menu_a2"/>
+    <item
+        android:id="@+id/menu_a3"
+        android:title="@string/menu_a3"/>
+ 
+NotelistActivity
+//背景图功能
+    public int mode=-1;
+//    私密模式
+    public static int secret_mode = 0;
+//        背景图功能
+        getWindow().setBackgroundDrawableResource(R.drawable.a3);
+        getWindow().setBackgroundDrawableResource(R.drawable.a2);
+        getWindow().setBackgroundDrawableResource(R.drawable.a1);
+//        背景功能
+        if(mode==-1)
+            menu.findItem(R.id.menu_a1).setVisible(false);
+        else if (mode==0)
+            menu.findItem(R.id.menu_a2).setVisible(false);
+        else if (mode==1)
+            menu.findItem(R.id.menu_a3).setVisible(false);
+
+//            背景功能
+            case R.id.menu_a1:{
+                mode=-1;
+                getWindow().setBackgroundDrawableResource(R.drawable.a1);
+                break;
+            }
+            case R.id.menu_a2:{
+                mode=0;
+                getWindow().setBackgroundDrawableResource(R.drawable.a2);
+                break;
+            }
+            case R.id.menu_a3:{
+                mode=1;
+                getWindow().setBackgroundDrawableResource(R.drawable.a3);
+                break;
+            }
+Values_string
+<!--    背景图功能 -->
+    <string name="menu_a2">Background: a2</string>
+    <string name="menu_a1">Background: a1</string>
+    <string name="menu_a3">Background: a3</string>
+
+
+
+        if(secret_mode == 1)menu.findItem(R.id.menu_secret).setVisible(false); else
+            menu.findItem(R.id.menu_quit_secret).setVisible(false);
+public void supportInvalidateOptionsMenu() {
+    invalidateOptionsMenu(); // 最终调用 Activity 的原生方法
+}
+            case R.id.menu_secret: {    // 进入私密模式
+                secret_mode = 1;  // 先临时设为1（用于对话框标题提示）
+                AlertDialog.Builder dialog = new AlertDialog.Builder(NotesListActivity.this);
+                dialog.setTitle("重要提醒")
+                        .setMessage("您确认进入私密模式吗？")
+                        .setCancelable(false)
+                        .setPositiveButton("确认", (d, which) -> {
+                            startAsyncNotesListQuery();
+                            Toast.makeText(NotesListActivity.this, "您已进入私密模式", Toast.LENGTH_SHORT).show();
+                        })
+                        .setNegativeButton("取消", (d, which) -> {
+                            secret_mode = 0;  // 恢复状态
+                            supportInvalidateOptionsMenu();  // 强制刷新菜单 })
+                        .show();
+                break;}
+            case R.id.menu_quit_secret: {    // 退出私密模式
+                AlertDialog.Builder dialog = new AlertDialog.Builder(NotesListActivity.this);
+                dialog.setTitle("重要提醒")
+                        .setMessage("您确认退出私密模式吗？")
+                        .setCancelable(false)
+                        .setPositiveButton("确认", (d, which) -> {
+                            secret_mode = 0;
+                            startAsyncNotesListQuery();
+                            supportInvalidateOptionsMenu();  // 刷新菜单
+                            Toast.makeText(NotesListActivity.this, "您已退出私密模式", Toast.LENGTH_SHORT).show();
+                        })
+                        .setNegativeButton("取消", null)  // 无需操作
+                        .show();
+                break;
+            }
+Values_string
+ShareActionProvider
+public boolean onCreateOptionsMenu(Menu menu) {
+    getMenuInflater().inflate(R.menu.note_list, menu);
+    MenuItem enterSecret = menu.findItem(R.id.menu_secret);
+    MenuItem quitSecret = menu.findItem(R.id.menu_quit_secret);
+    enterSecret.setVisible(secret_mode == 0);  // 非私密模式时显示"进入"
+    quitSecret.setVisible(secret_mode == 1);   // 私密模式时显示"退出"
+    return true;
+}
+<!--    私密模式  -->
+    <string name="Secret">secret model</string>
+    <string name="Quit_Secret">quit secret model</string>
+Menu_Sub_folder
+<!--    私密模式  -->
+    <item
+        android:id="@+id/menu_secret"
+        android:title="@string/Secret"/>
+    <item
+        android:id="@+id/menu_quit_secret"
+        android:title="@string/Quit_Secret"/>
+//    私密模式
+    public static int secret_mode = 0;
+private void startAsyncNotesListQuery() {
+        String selection = (mCurrentFolderId == Notes.ID_ROOT_FOLDER) ? ROOT_FOLDER_SELECTION
+                : NORMAL_SELECTION;
+        if(secret_mode == 0) {
+            mBackgroundQueryHandler.startQuery(FOLDER_NOTE_LIST_QUERY_TOKEN, null,
+                    Notes.CONTENT_NOTE_URI, NoteItemData.PROJECTION, selection, new String[]{
+                            String.valueOf(mCurrentFolderId)
+                    }, NoteColumns.TYPE + " DESC," + NoteColumns.MODIFIED_DATE + " DESC");
+        }
+        else{
+            String str1 = "111";
+            String [] PROJECTION = new String [] {  //定义一个新的PROJECTION数组，只换掉SNIPPET
+                    NoteColumns.ID,
+                    NoteColumns.ALERTED_DATE,
+                    NoteColumns.BG_COLOR_ID,
+                    NoteColumns.CREATED_DATE,
+                    NoteColumns.HAS_ATTACHMENT,
+                    NoteColumns.MODIFIED_DATE,
+                    NoteColumns.NOTES_COUNT,
+                    NoteColumns.PARENT_ID,
+//                    NoteColumns.SNIPPET,
+                    str1,
+                    NoteColumns.TYPE,
+                    NoteColumns.WIDGET_ID,
+                    NoteColumns.WIDGET_TYPE,
+            };
+            mBackgroundQueryHandler.startQuery(FOLDER_NOTE_LIST_QUERY_TOKEN, null,
+                    Notes.CONTENT_NOTE_URI, PROJECTION, selection, new String[]{
+                            String.valueOf(mCurrentFolderId)
+                    }, NoteColumns.TYPE + " DESC," + NoteColumns.MODIFIED_DATE + " DESC");
+
+        }
+    }