HarmonyOS EntryAbility中可以获取到getContext的时机

let preferences: dataPreferences.Preferences | null = null;  
  
class EntryAbility extends UIAbility {  
  onWindowStageCreate(windowStage: window.WindowStage) {  
    dataPreferences.getPreferences(this.context, 'myStore', (err: BusinessError, val: dataPreferences.Preferences) => {  
      if (err) {  
        console.error("Failed to get preferences. code =" + err.code + ", message =" + err.message);  
        return;  
      }  
      preferences = val;  
      console.info("Succeeded in getting preferences.");  
    })  
  }  
}
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