如何暂停执行后退按钮,直到订阅完成?

只需覆盖后退按钮并使用一些标志?例如。

private boolean delayedBack = false; // as member field

...other Activity code

@Override
public void onBackPressed(){
   if(someCondition)
      super.onBackPressed();
    else
      delayedBack = true;  
}

然后,当一些异步操作完成时,只需检查该标志:

 if(delayedBack){
   super.onBackPressed();
   delayedBack = false; // in case you don't want to finish the Activity
  }

super.onBackPressed(); 在大多数情况下,这将完成 Activity