Flutter 项目在设备安全区如何适配？

let type = window.AvoidAreaType.TYPE_SYSTEM; 
try { 
  let avoidArea = windowClass.getWindowAvoidArea(type); 
  let bottomHeight = avoidArea .bottomRect.height 
} catch (exception) { 
  console.error('Failed to obtain the area. Cause:' + JSON.stringify(exception)); 
}