From d8deacd04b03000da53c5c4afe8b6fdf5c279347 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=AA=9C=E7=A8=80=E4=B8=94=E4=B9=B1=E8=B9=A6?=
 <16379523+sst999@user.noreply.gitee.com>
Date: Wed, 5 Nov 2025 06:47:20 +0000
Subject: [PATCH] update
 PageAndData04/04_StartingPoint/entry/src/main/ets/view/Home.ets.
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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Signed-off-by: 窜稀且乱蹦 <16379523+sst999@user.noreply.gitee.com>
---
 .../entry/src/main/ets/view/Home.ets          | 81 ++++++++++++++++---
 1 file changed, 71 insertions(+), 10 deletions(-)

diff --git a/PageAndData04/04_StartingPoint/entry/src/main/ets/view/Home.ets b/PageAndData04/04_StartingPoint/entry/src/main/ets/view/Home.ets
index 02bd48d..c939061 100644
--- a/PageAndData04/04_StartingPoint/entry/src/main/ets/view/Home.ets
+++ b/PageAndData04/04_StartingPoint/entry/src/main/ets/view/Home.ets
@@ -14,6 +14,7 @@
  */
 
 import { common } from '@kit.AbilityKit';
+import { preferences } from '@kit.ArkData';
 import mainViewModel from '../viewmodel/MainViewModel';
 import ItemData from '../viewmodel/ItemData';
 import ListInfo from '../viewmodel/ResponseData/ListInfo';
@@ -28,20 +29,80 @@ export default struct Home {
   @State httpGridItems: Array<ListInfo> = [];
   @State pictureUri: string = '';
   private swiperController: SwiperController = new SwiperController();
-  private context = this.getUIContext().getHostContext() as common.UIAbilityContext;
+  private context = this.getUIContext().getHostHostContext() as common.UIAbilityContext;
   private applicationContext = this.context.getApplicationContext();
   private cacheDir = this.applicationContext.filesDir;
 
   async aboutToAppear(): Promise<void> {
-    // let httpUtil: HttpUtils = new HttpUtils();
-    // this.httpGridItems = await httpUtil.postHttpRequest();
-    // this.pictureUri = await httpUtil.getHttpRequest(this.cacheDir);
-    // httpUtil.destroyHttpRequest();
-
-    let rcpUtil: RCPUtils = new RCPUtils();
-    this.httpGridItems = await rcpUtil.postRCPRequest();
-    this.pictureUri = await rcpUtil.getRCPRequest(this.cacheDir);
-    rcpUtil.destroySession();
+    // 先尝试从本地加载数据
+    const hasLocalData = await this.loadDataFromLocal();
+
+    // 如果本地没有数据或数据过期，则从网络获取
+    if (!hasLocalData || await this.isDataExpired()) {
+      console.info('Fetching fresh data from network');
+
+      let rcpUtil: RCPUtils = new RCPUtils();
+      this.httpGridItems = await rcpUtil.postRCPRequest();
+      this.pictureUri = await rcpUtil.getRCPRequest(this.cacheDir);
+
+      // 保存新数据
+      await this.saveDataToLocal();
+
+      rcpUtil.destroySession();
+    } else {
+      console.info('Using cached data');
+    }
+  }
+
+  // 保存数据到Preferences
+  private async saveDataToLocal(): Promise<void> {
+    try {
+      let prefs = await preferences.getPreferences(this.context, 'home_data');
+      await prefs.put('httpGridItems', JSON.stringify(this.httpGridItems));
+      await prefs.put('pictureUri', this.pictureUri);
+      await prefs.put('lastUpdateTime', Date.now().toString());
+      await prefs.flush();
+      console.info('Data saved successfully');
+    } catch (err) {
+      console.error('Failed to save data: ' + err);
+    }
+  }
+
+  // 从本地加载数据
+  private async loadDataFromLocal(): Promise<boolean> {
+    try {
+      let prefs = await preferences.getPreferences(this.context, 'home_data');
+      let hasData = await prefs.has('httpGridItems');
+      if (!hasData) {
+        return false;
+      }
+
+      let gridItemsStr = await prefs.get('httpGridItems', '');
+      if (gridItemsStr) {
+        this.httpGridItems = JSON.parse(gridItemsStr);
+      }
+
+      this.pictureUri = await prefs.get('pictureUri', '');
+      console.info('Data loaded from local storage');
+      return true;
+    } catch (err) {
+      console.error('Failed to load data: ' + err);
+      return false;
+    }
+  }
+
+  // 检查数据是否过期
+  private async isDataExpired(): Promise<boolean> {
+    try {
+      let prefs = await preferences.getPreferences(this.context, 'home_data');
+      let lastUpdateTimeStr = await prefs.get('lastUpdateTime', '0');
+      let lastUpdateTime = parseInt(lastUpdateTimeStr);
+
+      const ONE_HOUR = 60 * 60 * 1000;
+      return (Date.now() - lastUpdateTime) > ONE_HOUR;
+    } catch (err) {
+      return true;
+    }
   }
 
   build() {
-- 
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