怎么监听整个app应用的运行状态，应用级别的前后台切换的监听

onWindowStageCreate(windowStage: window.WindowStage) { 
  // Main window is created, set main page for this ability 
  hilog.info(0x0000, ‘testTag’, ‘%{public}s’, ‘Ability onWindowStageCreate’); 
 
  windowStage.loadContent(‘pages/AppGeoLocation’, (err, data) => { 
    if (err.code) { 
      hilog.error(0x0000, ‘testTag’, ‘Failed to load the content. Cause: %{public}s’, JSON.stringify(err) ?? ‘’); 
      return; 
    } 
    windowStage.getMainWindowSync().on(“windowEvent”, (data) => { 
      if (data == window.WindowEventType.WINDOW_SHOWN) { 
        console.log(“App is in Foreground”) 
      } 
      else if(data == window.WindowEventType.WINDOW_HIDDEN){ 
        console.log(“App is in Background”) 
      } 
    }) 
    hilog.info(0x0000, ‘testTag’, ‘Succeeded in loading the content. Data: %{public}s’, JSON.stringify(data) ?? ‘’); 
  }); 
}