首页返回键逻辑处理，改为切后台

@@ -3,12 +3,12 @@ import { BreakpointConstants } from 'wdConstant';
 
 import { HWLocationUtils, WDPushNotificationManager } from 'wdHwAbility/Index';
 import { common } from '@kit.AbilityKit';
-import { BreakpointSystem, EmitterEventId, EmitterUtils, Logger, MpaasUpgradeCheck } from 'wdKit';
-import router from '@ohos.router';
-import { promptAction } from '@kit.ArkUI';
+import { BreakpointSystem, EmitterEventId, EmitterUtils, Logger, MpaasUpgradeCheck, WindowModel } from 'wdKit';
+import { promptAction, window } from '@kit.ArkUI';
 import { UpgradeTipDialog } from "./upgradePage/UpgradeTipDialog"
 import { ProcessUtils } from 'wdRouter/Index';
 import { StartupManager } from '../startupmanager/StartupManager';
+import { BusinessError } from '@kit.BasicServicesKit';
 
 const TAG = 'MainPage';
 
@@ -18,7 +18,8 @@ struct MainPage {
   @Provide pageShow: number = -1
   @Provide pageHide: number = -1
   private breakpointSystem: BreakpointSystem = new BreakpointSystem()
-  @StorageLink('currentBreakpoint') @Watch('watchCurrentBreakpoint') currentBreakpoint: string = BreakpointConstants.BREAKPOINT_XS;
+  @StorageLink('currentBreakpoint') @Watch('watchCurrentBreakpoint') currentBreakpoint: string =
+    BreakpointConstants.BREAKPOINT_XS;
   @State isPermission: boolean = false
   upgradeDialogController?: CustomDialogController
 
@@ -47,7 +48,7 @@ struct MainPage {
       LogoutViewModel.clearLoginInfo()
     })
     EmitterUtils.receiveEvent(EmitterEventId.LOCATION, () => {
-      this.isPermission=true
+      this.isPermission = true
     })
   }
 
@@ -81,7 +82,7 @@ struct MainPage {
 
         this.upgradeDialogController = new CustomDialogController({
           builder: UpgradeTipDialog({
-            tipContent:data,
+            tipContent: data,
             confirm: () => {
               ProcessUtils.jumpExternalWebPage(data.downloadUrl);
             }
@@ -104,12 +105,26 @@ struct MainPage {
 
   onBackPress() {
     Logger.info(TAG, 'onBackPress');
+    try {
+      // 拦截返回键，切到后台
+      const windowClass = WindowModel.shared.getWindowClass() as window.Window
+      windowClass.minimize().then(() => {
+        Logger.debug(TAG, 'Succeeded in minimizing the window.');
+      }).catch((err: BusinessError) => {
+        Logger.error(TAG, 'Failed to minimize the window. Cause: ' + JSON.stringify(err));
+        return false
+      });
+    } catch (err) {
+      Logger.error(TAG, 'Failed to minimize: ' + JSON.stringify(err));
+      return false
+    }
+    return true
   }
 
   build() {
-    Stack({alignContent:Alignment.Top}) {
+    Stack({ alignContent: Alignment.Top }) {
       BottomNavigationComponent()
-      if(this.isPermission){
+      if (this.isPermission) {
         PermissionDesComponent()
       }
     }