如何从AsyncTask的返回的ArrayList到另一个类？

问题描述

我想使用的AsyncTask服务器获取FTP文件夹列表，并返回文件夹名称的ArrayList到主类和更新微调适配器。

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

在主类，我得到适配器微调

In main class i got spinner with adapter

//the array i want to update in AsyncTask
static ArrayList<String> directoriesTeacher = new ArrayList<String>();

//The adapter
createfile_spinTeacher = (Spinner) findViewById(R.id.createfile_spinTeacher);
final ArrayAdapter<String> dataAdapterTeacher = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item,directoriesTeacher);
dataAdapterTeacher.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
createfile_spinTeacher.setAdapter(dataAdapterTeacher);

这是在AsyncTask的：

An in AsyncTask:

    package com.nedoGarazas.learnanylanguage;

    import java.util.ArrayList;

    import org.apache.commons.net.ftp.FTP;
    import org.apache.commons.net.ftp.FTPClient;
    import org.apache.commons.net.ftp.FTPFile;
    import org.apache.commons.net.ftp.FTPReply;

    import android.os.AsyncTask;
    import android.util.Log;

    public class FtpTeacher extends AsyncTask<ArrayList<String>, Void, ArrayList<String>> {
    private static final String TAG = "MyFTPClient";
    public FTPClient mFTPClient = null;
     ArrayList<String> ftpTeacher = new ArrayList<String>();
    @Override
    protected ArrayList<String> doInBackground(ArrayList<String>... params) {
        {
            try {
                mFTPClient = new FTPClient();
         // connecting to the host
                mFTPClient.connect("host.ftp.com", 21);

          // now check the reply code, if positive mean connection success
                if     (FTPReply.isPositiveCompletion(mFTPClient.getReplyCode())) {
      // login using username & password
                    boolean status = mFTPClient.login("admin", "admin");
                    if(status == true){

                            try {
                                FTPFile[] ftpFiles = mFTPClient.listFiles("/Wordsftp/");
                                int length = ftpFiles.length;

                                for (int i = 0; i < length; i++) {
                                    String name = ftpFiles[i].getName();
                                    boolean isDirectory = ftpFiles[i].isDirectory();

                                    if (isDirectory) {
//adding to arraylist
                                        ftpTeacher.add(name);
                                        Log.i(TAG, "Yra : " + name);
                                    }
                                    else {
                                        Log.i(TAG, "Directory : " + name);

                                }
                             }
                            } catch(Exception e) {
                            e.printStackTrace();
                        }


                    mFTPClient.setFileType(FTP.ASCII_FILE_TYPE);
                    mFTPClient.enterLocalPassiveMode();


}
                }
} catch(Exception e) {
Log.d(TAG, "Error: could not connect to host ");
}
return ftpTeacher;
}
            }

    protected ArrayList<String>[] onPostExecute(ArrayList<String>... result) {
        ////How to return?

    }

    }

那么，如何应与主类和更新更​​新微调的ArrayList取代的ArrayList中的AsyncTask dinamicly？

So how should i replace arraylist in AsyncTask with ArrayList in main class and update spinner updater dinamicly?

推荐答案

您已经取得的ArrayList中的静态后，将其公开为好。并使用你的类名。并填充onPostExecute你的ArrayList（）;像

You already made your ArrayList static, make it public as well. and use that by your class name. and populate your ArrayList in onPostExecute(); like

     protected void onPostExecute(ArrayList<String>... result) {

    if(YourClassName.directoriesTeacher.size()>0)
     {
       YourClassName.directoriesTeacher.clear();
      }

      YourClassName.directoriesTeacher.addAll(result);

     }

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