diff --git a/client/electron/test/harmony-logic.test.mjs b/client/electron/test/harmony-logic.test.mjs
index 70b8bf5..108a14f 100644
--- a/client/electron/test/harmony-logic.test.mjs
+++ b/client/electron/test/harmony-logic.test.mjs
@@ -20,7 +20,7 @@
  */
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
-import { readFileSync } from 'node:fs';
+import { readFileSync, readdirSync } from 'node:fs';
 import { dirname, join } from 'node:path';
 import { fileURLToPath, pathToFileURL } from 'node:url';
 
@@ -338,7 +338,10 @@ test('徽标真的挂在界面上，且点它能看到那句说明（触屏没
   const clickIdx = pageCode.indexOf('.onClick(', chipIdx);
   assert.ok(chipIdx > 0 && clickIdx > chipIdx && clickIdx - chipIdx < 600, '徽标上要有自己的 onClick');
   const chipClickBody = onClickBodyOf(pageCode, clickIdx);
-  assert.match(chipClickBody, /promptAction\.showToast\(/, '徽标的 onClick 里要弹说明（不是页面别处的 toast）');
+  // 注意用**非废弃**的写法：全局 `promptAction.showToast` 自 API 18 起废弃
+  // （SDK `@ohos.promptAction.d.ts` 的 `@deprecated since 18`），
+  // 要的是 UIContext 上的那个 —— 这条断言顺带把废弃写法挡在门外。
+  assert.match(chipClickBody, /\.getPromptAction\(\)\.showToast\(/, '徽标的 onClick 里要弹说明（UIContext 的非废弃写法）');
   assert.match(chipClickBody, /permissionHint\(/, '弹出来的必须是那句说明');
   assert.match(pageCode, /enforcementLabel\(c\.permission_enforcement\)/, '说明里要带强制力标签');
   assert.match(pageCode, /permissionLabel\(mail\.permission_mode\)/, '收件箱行要用中文档位');
@@ -349,3 +352,35 @@ test('徽标真的挂在界面上，且点它能看到那句说明（触屏没
     '收件箱每封邮件里没有 permission_enforcement，画强制力标记等于编一个"平台做到了什么"'
   );
 });
+
+test('★ 不得再用废弃的全局 promptAction.showToast（API 18 起废弃，要走 UIContext）', () => {
+  /*
+   * SDK 里写得很清楚：`@ohos.promptAction.d.ts` 的全局 `showToast` 标着
+   * `@deprecated since 18`，替代品是 `UIContext.getPromptAction()`。
+   * 本仓库原先有 **23 处**这种调用（不是我写的，是历史）—— 既然这一轮在按
+   * "用系统方案"整理鸿蒙侧，就顺手一次扫干净，并用判据挡住回潮：
+   * 新增页面照抄旧写法是最常见的回退路径，而它**编译照样通过**。
+   */
+  const dir = join(ROOT, 'client/harmony/entry/src/main/ets');
+  const files = [];
+  const walk = d => {
+    for (const e of readdirSync(d, { withFileTypes: true })) {
+      const full = join(d, e.name);
+      if (e.isDirectory()) walk(full);
+      else if (/\.(ets|ts)$/.test(e.name)) files.push(full);
+    }
+  };
+  walk(dir);
+  assert.ok(files.length >= 10, `应扫到至少 10 个源文件，实际 ${files.length}`);
+
+  const bad = [];
+  for (const f of files) {
+    const src = readFileSync(f, 'utf8').replace(/\/\*[\s\S]*?\*\//g, '').replace(/^\s*\/\/.*$/gm, '');
+    // `getPromptAction().showToast(` 不算违规：它前面必须有 `get`
+    for (const m of src.matchAll(/(?<!get)promptAction\.showToast\(/g)) bad.push(f.slice(ROOT.length + 1));
+  }
+  assert.deepEqual(bad, [], `这些文件还在用废弃的全局 promptAction.showToast：${bad.join('、')}`);
+  // 反向对照：自检正则要真能认出旧写法、且不误伤新写法
+  assert.ok(/(?<!get)promptAction\.showToast\(/.test('promptAction.showToast({ message: 1 })'), '自检：认不出旧写法');
+  assert.ok(!/(?<!get)promptAction\.showToast\(/.test('this.getUIContext().getPromptAction().showToast({})'), '自检：误伤了新写法');
+});
diff --git a/client/harmony/entry/src/main/ets/pages/ComposePage.ets b/client/harmony/entry/src/main/ets/pages/ComposePage.ets
index 2d2e57d..4e37f6c 100644
--- a/client/harmony/entry/src/main/ets/pages/ComposePage.ets
+++ b/client/harmony/entry/src/main/ets/pages/ComposePage.ets
@@ -9,7 +9,6 @@ import { MailApi } from '../api/MailApi';
 import { AccountManager, AccountInfo } from '../api/AccountManager';
 import { SendMailRequest } from '../model/Models';
 import { ComposeParams } from '../model/RouteParams';
-import { promptAction } from '@kit.ArkUI';
 import { hilog } from '@kit.PerformanceAnalysisKit';
 import { picker } from '@kit.CoreFileKit';
 
@@ -92,7 +91,7 @@ struct ComposePage {
 
       const mailApi: MailApi | null = this.createSelectedMailApi(ctx);
       if (mailApi === null) {
-        promptAction.showToast({ message: '请先选择发信账号' });
+        this.getUIContext().getPromptAction().showToast({ message: '请先选择发信账号' });
         return;
       }
       this.uploading = true;
@@ -108,7 +107,7 @@ struct ComposePage {
           hilog.info(0x0001, 'Compose', 'uploaded: %{public}s → %{public}s', name, attachmentId);
         } catch (e) {
           const apiError = e as ApiError;
-          promptAction.showToast({ message: '上传失败: ' + name + ' - ' + apiError.message });
+          this.getUIContext().getPromptAction().showToast({ message: '上传失败: ' + name + ' - ' + apiError.message });
         }
       }
       this.status = this.attachmentIds.length + ' 个附件已上传';
@@ -133,11 +132,11 @@ struct ComposePage {
       return;
     }
     if (this.to.length === 0) {
-      promptAction.showToast({ message: '请填写收件人' });
+      this.getUIContext().getPromptAction().showToast({ message: '请填写收件人' });
       return;
     }
     if (this.subject.length === 0) {
-      promptAction.showToast({ message: '请填写主题' });
+      this.getUIContext().getPromptAction().showToast({ message: '请填写主题' });
       return;
     }
     const ctx: Context | undefined = this.getUIContext().getHostContext();
@@ -146,7 +145,7 @@ struct ComposePage {
     }
     const mailApi: MailApi | null = this.createSelectedMailApi(ctx);
     if (mailApi === null) {
-      promptAction.showToast({ message: '请先选择发信账号' });
+      this.getUIContext().getPromptAction().showToast({ message: '请先选择发信账号' });
       return;
     }
 
@@ -166,11 +165,11 @@ struct ComposePage {
         request.attachment_ids = this.attachmentIds;
       }
       await mailApi.send(request);
-      promptAction.showToast({ message: '✅ 邮件已发送' });
+      this.getUIContext().getPromptAction().showToast({ message: '✅ 邮件已发送' });
       this.getUIContext().getRouter().back();
     } catch (e) {
       const apiError = e as ApiError;
-      promptAction.showToast({ message: '发送失败: ' + apiError.message });
+      this.getUIContext().getPromptAction().showToast({ message: '发送失败: ' + apiError.message });
     } finally {
       this.sending = false;
     }
diff --git a/client/harmony/entry/src/main/ets/pages/InboxPage.ets b/client/harmony/entry/src/main/ets/pages/InboxPage.ets
index 3056029..3387487 100644
--- a/client/harmony/entry/src/main/ets/pages/InboxPage.ets
+++ b/client/harmony/entry/src/main/ets/pages/InboxPage.ets
@@ -6,7 +6,7 @@ import { ApiClient, ApiError } from '../api/ApiClient';
 import { Theme } from '../common/Theme';
 import { MailApi } from '../api/MailApi';
 import { MailSummary, Me } from '../model/Models';
-import { promptAction, router } from '@kit.ArkUI';
+import { router } from '@kit.ArkUI';
 
 @Entry
 @Component
diff --git a/client/harmony/entry/src/main/ets/pages/LoginPage.ets b/client/harmony/entry/src/main/ets/pages/LoginPage.ets
index 022e800..69bfeb6 100644
--- a/client/harmony/entry/src/main/ets/pages/LoginPage.ets
+++ b/client/harmony/entry/src/main/ets/pages/LoginPage.ets
@@ -10,7 +10,6 @@ import { AccountManager } from '../api/AccountManager';
 import { SseService } from '../api/SseService';
 import { Me } from '../model/Models';
 import { DEFAULT_API_BASE, EMULATOR_HOST_BASE } from '../common/Config';
-import { promptAction } from '@kit.ArkUI';
 import { hilog } from '@kit.PerformanceAnalysisKit';
 
 @Entry
@@ -125,7 +124,7 @@ struct LoginPage {
       const ae = e as ApiError;
       const msg: string = ae.code === 0 ? ae.message : (ae.message.length > 0 ? ae.message : '登录失败');
       hilog.error(0x0001, 'LoginPage', 'login failed: code=%{public}d msg=%{public}s', ae.code, msg);
-      promptAction.showToast({ message: msg });
+      this.getUIContext().getPromptAction().showToast({ message: msg });
     } finally {
       this.loading = false;
     }
diff --git a/client/harmony/entry/src/main/ets/pages/MailDetailPage.ets b/client/harmony/entry/src/main/ets/pages/MailDetailPage.ets
index 7891efe..492c5bb 100644
--- a/client/harmony/entry/src/main/ets/pages/MailDetailPage.ets
+++ b/client/harmony/entry/src/main/ets/pages/MailDetailPage.ets
@@ -9,7 +9,6 @@ import { MailApi } from '../api/MailApi';
 import { AccountManager, AccountInfo } from '../api/AccountManager';
 import { MailDetail, SendMailRequest } from '../model/Models';
 import { MailDetailParams } from '../model/RouteParams';
-import { promptAction } from '@kit.ArkUI';
 
 @Entry
 @Component
@@ -103,10 +102,10 @@ struct MailDetailPage {
     try {
       await m.setPermissionMode(sid, mode);
       this.permissionMode = mode;
-      promptAction.showToast({ message: '权限已切换为 ' + mode });
+      this.getUIContext().getPromptAction().showToast({ message: '权限已切换为 ' + mode });
     } catch (e) {
       const ae = e as ApiError;
-      promptAction.showToast({ message: '切换失败: ' + ae.message });
+      this.getUIContext().getPromptAction().showToast({ message: '切换失败: ' + ae.message });
     } finally {
       this.switchingPerm = false;
     }
@@ -306,10 +305,10 @@ struct MailDetailPage {
       await m.send(req);
       this.showReplyBox = false;
       this.replyBody = '';
-      promptAction.showToast({ message: '回复已发送' });
+      this.getUIContext().getPromptAction().showToast({ message: '回复已发送' });
     } catch (e) {
       const ae = e as ApiError;
-      promptAction.showToast({ message: '发送失败: ' + ae.message });
+      this.getUIContext().getPromptAction().showToast({ message: '发送失败: ' + ae.message });
     } finally {
       this.sending = false;
     }
diff --git a/client/harmony/entry/src/main/ets/pages/MainPage.ets b/client/harmony/entry/src/main/ets/pages/MainPage.ets
index 4c1bfa6..1498df2 100644
--- a/client/harmony/entry/src/main/ets/pages/MainPage.ets
+++ b/client/harmony/entry/src/main/ets/pages/MainPage.ets
@@ -26,7 +26,6 @@ import {
   enforcementLabel
 } from '../model/MailGrouping';
 import { MailDetailParams, ComposeParams } from '../model/RouteParams';
-import { promptAction } from '@kit.ArkUI';
 
 /** 一页取多少封。取满了就要如实提示"可能还有更多"（服务端 total 是未读数，不是总封数）。 */
 const INBOX_PAGE_SIZE: number = 50;
@@ -89,7 +88,7 @@ struct InboxTab {
           break;
         }
       }
-      promptAction.showToast({ message: sourceName.length > 0 ? '📨 ' + sourceName + ' 收到新邮件' : '📨 新邮件到达' });
+      this.getUIContext().getPromptAction().showToast({ message: sourceName.length > 0 ? '📨 ' + sourceName + ' 收到新邮件' : '📨 新邮件到达' });
       this.loadData();
     }
   };
@@ -737,7 +736,7 @@ struct ContactsTab {
             .padding({ left: 5, right: 5, top: 1, bottom: 1 })
             .margin({ right: 6 })
             .onClick(() => {
-              promptAction.showToast({
+              this.getUIContext().getPromptAction().showToast({
                 message: permissionHint(c.permission_mode, c.permission_enforcement)
                   + '（强制力：' + enforcementLabel(c.permission_enforcement) + '）',
                 duration: 6000
diff --git a/client/harmony/entry/src/main/ets/pages/SettingsPage.ets b/client/harmony/entry/src/main/ets/pages/SettingsPage.ets
index 85978c2..93e3dc5 100644
--- a/client/harmony/entry/src/main/ets/pages/SettingsPage.ets
+++ b/client/harmony/entry/src/main/ets/pages/SettingsPage.ets
@@ -7,7 +7,6 @@ import { Theme } from '../common/Theme';
 import { AuthApi } from '../api/AuthApi';
 import { AccountManager, AccountInfo } from '../api/AccountManager';
 import { SseService } from '../api/SseService';
-import { promptAction } from '@kit.ArkUI';
 
 @Entry
 @Component
@@ -66,7 +65,7 @@ struct SettingsPage {
     if (account !== null) {
       client.setBase(account.server);
       client.setToken(account.token);
-      promptAction.showToast({ message: '默认发信账号已设为 ' + account.displayName });
+      this.getUIContext().getPromptAction().showToast({ message: '默认发信账号已设为 ' + account.displayName });
     }
     this.refreshList();
   }
@@ -92,7 +91,7 @@ struct SettingsPage {
       }
     }
     this.refreshList();
-    promptAction.showToast({ message: '账号已删除' });
+    this.getUIContext().getPromptAction().showToast({ message: '账号已删除' });
   }
 
   async addNewAccount(): Promise<void> {
@@ -106,7 +105,7 @@ struct SettingsPage {
     const token: string = this.newToken.trim();
     const optionalUsername: string = this.newUsername.trim();
     if (displayName.length === 0 || server.length === 0 || token.length === 0) {
-      promptAction.showToast({ message: '请填写显示名称、Gateway 地址和 user_key' });
+      this.getUIContext().getPromptAction().showToast({ message: '请填写显示名称、Gateway 地址和 user_key' });
       return;
     }
 
@@ -119,7 +118,7 @@ struct SettingsPage {
       const username: string = optionalUsername.length > 0 ? optionalUsername : user.username;
       const account: AccountInfo = await manager.addAccount(server, username, token, displayName);
       SseService.getInstance().connectForAccount(account.id, account.server, account.token);
-      promptAction.showToast({ message: '✅ 添加成功: ' + account.displayName });
+      this.getUIContext().getPromptAction().showToast({ message: '✅ 添加成功: ' + account.displayName });
       this.showAddDialog = false;
       this.newDisplayName = '';
       this.newServer = '';
@@ -128,7 +127,7 @@ struct SettingsPage {
       this.refreshList();
     } catch (e) {
       const apiError = e as ApiError;
-      promptAction.showToast({ message: '验证失败: ' + apiError.message });
+      this.getUIContext().getPromptAction().showToast({ message: '验证失败: ' + apiError.message });
     } finally {
       this.adding = false;
     }
diff --git a/docs/HARMONY-ALIGN-PLAN.md b/docs/HARMONY-ALIGN-PLAN.md
index beeef5c..e6876c9 100644
--- a/docs/HARMONY-ALIGN-PLAN.md
+++ b/docs/HARMONY-ALIGN-PLAN.md
@@ -543,3 +543,17 @@ deb 也不必从 targets 里摘。已写进 `client/electron/BUILD.md`（含排
 深色模式下的观感，都只有真机才看得到（模拟器需人在命令行启动）。已验证的是：
 `hvigorw assembleHap` BUILD SUCCESSFUL、13 条跨端判据 + 4 条系统资源名判据全绿、
 四种变异都能判红；`sys.*` 名字全部对着 SDK 名表核过（判据持续盯着）。
+
+### 7.14 顺手扫掉 23 处废弃 API（全局 `promptAction.showToast`）
+
+SDK 里写着：`@ohos.promptAction.d.ts` 的全局 `showToast` 标 `@deprecated since 18`，
+替代品是 `UIContext.getPromptAction()`。仓库里原有 **23 处**这种调用（历史遗留，6 个页面）——
+既然这一轮在按"用系统方案"整理鸿蒙侧，就一次扫干净：
+`promptAction.showToast(...)` → `this.getUIContext().getPromptAction().showToast(...)`，
+并清掉不再需要的 import。
+
+**判据**：不得再用全局写法（负向断言，自检里同时验"认得出旧写法"且"不误伤新写法"）。
+这条防的不是这次，而是**新增页面照抄旧代码**这条最常见的回退路径 —— 它编译照样通过。
+
+（同一批整理里还没做的：全局 `animateTo` 也要走 `getUIContext().animateTo(...)`，
+放到动效那一期一起改 —— 那一期本来就是"自定义 transition → 系统 `curves`"。）