uniappx 安卓，如何简单的监听按键【自己搞定了！后来人请看！】

终于自己看文档钻研搞定了。。。
太难了。。。
这是示例，不会的可以直接抄作业了：

class UTSAcvitiyKeyEventCallback extends UniActivityKeyEventCallback {  
  constructor() {  
    super()  
  }  
  override onKeyDown(params : UniActivityParams, keyCode : Int, event : KeyEvent | null) {  
    console.log('UTSAcvitiyKeyEvent', 'onKeyDown', params, keyCode, '' + event)  
  }  
  override onPreKeyDown(params : UniActivityParams, keyCode : Int, event : KeyEvent | null) {  
    console.log('UTSAcvitiyKeyEvent', 'onPreKeyDown', params, keyCode, '' + event)  
  }  
  override onKeyLongPress(params : UniActivityParams, keyCode : Int, event : KeyEvent | null) {  
    console.log('UTSAcvitiyKeyEvent', 'onKeyLongPress', params, keyCode, '' + event)  
  }  
  override onPreKeyLongPress(params : UniActivityParams, keyCode : Int, event : KeyEvent | null) {  
    console.log('UTSAcvitiyKeyEvent', 'onPreKeyLongPress', params, keyCode, '' + event)  
  }  
}  

UTSAndroid.onActivityCallback(new UTSAcvitiyKeyEventCallback());