#鸿蒙通关秘籍#如何在鸿蒙应用内实现全局悬浮窗

在鸿蒙应用内实现全局悬浮窗，需要通过创建子窗口并设置相关手势监听来实现。以下是详细步骤：

1. 初始化和创建子窗口：

   FloatManager.init(windowStage);
   init(windowStage: window.WindowStage) {
       this.windowStage_ = windowStage
   }
   
   showSubWindow() {
       if (this.windowStage_ != null) {
           this.windowStage_.createSubWindow("HarmonyWorld", (err: BusinessError, data) => {
               this.sub_windowClass = data;
               this.sub_windowClass.moveWindowTo(this.locationX, this.locationY, (err: BusinessError) => { ... });
               this.sub_windowClass.resize(this.size, this.size, (err: BusinessError) => { ... });
               this.sub_windowClass.setUIContent("pages/float/FloatPage", (err: BusinessError) => {
                   (this.sub_windowClass as window.Window).showWindow((err: BusinessError) => {
                       data.setWindowBackgroundColor("#00000000");
                   });
               });
           });
       } else {
           Log.error(TAG, 'Failed to create the subwindow. Cause: windowStage_ is null');
       }
   }
   

2. 手势监听设置：

   @Entry
   @Component
   export struct FloatPage {
       private context = getContext(this) as common.UIAbilityContext
       build() {
           Column() {
               Image($r('app.media.mobile_dev'))
                 .width('100%')
                 .height('100%')
           }
           .gesture(
               GestureGroup(GestureMode.Exclusive,
                   PanGesture()
                     .onActionUpdate((event: GestureEvent | undefined) => {
                         if (event) {
                             FloatManager.updateLocation(event.offsetX, event.offsetY)
                         }
                     }),
                   TapGesture({ count: 1 })
                     .onAction(() => {
                         router.pushUrl(...)
                     }))
           )
       }
   }
   

3. 地址更新：

   updateLocation(offSetX: number, offsetY: number) {
       if (this.sub_windowClass != null) {
           this.locationX = this.locationX + offSetX;
           this.locationY = this.locationY + offsetY;
           this.sub_windowClass.moveWindowTo(this.locationX, this.locationY, (err: BusinessError) => { ... });
       }
   }