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How to return ArrayList from AsyncTask to another class?

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被撕碎了的回忆 2021-01-21 20:01

i want to get Ftp folders list from server using AsyncTask and return folders names ArrayList to main class and update spinner adapter.

In main class i got spinner with

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  • 难免孤独
    难免孤独 (楼主)
    2021-01-21 20:32

    -- PSEUDO CODE --

    Create a custom interface as followed: 

    public interface IAsyncTask {

    void IAmFinished(ArrayList arrayList);

}



    Add a constructor to your AsyncTask:
    


    private IAsyncTask asyncTaskListener;

public MyAsyncTask(IAsyncTask asyncTaskListener){
     this.asyncTaskListener = asyncTaskListener;
}

    


    In your PostExecute of the AsyncTask:
    


    public void onPostExecute(List list) {
    asyncTaskListener.IAmFinished(list);
}

    


    In your Activity that starts your AsyncTask:
    


    MyAsyncTask asyncTask = new MyAsyncTask(this);
asyncTask.execute(..);

    


    Implement the interface:
    


    public class MyActivity implements IAsyncTask

    


    Implement the method:
    


    public void IAmFinished(ArrayList list){
    // Do whatever you want with your returned object
}

    
    
             
    
                                                        
    
            
            
    
              
                
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