Question

首先，不要因为没有搜索而激怒我，我已经找到了答案，虽然那里有答案，但我无法理解其中任何答案。

现在，除此之外，我正在尝试将我的ftp命令放入Android的ASync任务中。

代码：

package com.dronnoc.ftp;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.io.CopyStreamEvent;
import org.apache.commons.net.io.CopyStreamListener;
import org.apache.commons.net.io.Util;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;

public class Main extends Activity {
    /** Called when the activity is first created. */

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);


        FTPTransfer ftp = new FTPTransfer("hostname", "user", "pass");

        String data = Environment.getDataDirectory().toString();
        data += "/data/com.dronnoc.ftp/databases/test.db";

        boolean result = ftp.upload(data, "/ftp_dir/test.db");
        if(result)
        {
            Log.d("message", "Upload Successful.");
        }
        else
        {
            Log.e("message", ftp.error());
        }

    ftp.close();
    }
}

FTPTransfer.java

package com.dronnoc.ftp;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.SocketException;

import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPConnectionClosedException;


public class FTPTransfer {

    final FTPClient ftp = new FTPClient();
    private String error = null;
    private boolean connected = false;

    public FTPTransfer(String host, String username, String pass) {
        // TODO Auto-generated constructor stub
        try {
            ftp.connect(host);

            if(ftp.login(username, pass))
            {
                ftp.enterLocalPassiveMode();
                connected = true;
            }
        }
        catch (FTPConnectionClosedException e) { error = e.getMessage(); }
        catch (SocketException e) { error = e.getMessage(); }
        catch (IOException e) { error = e.getMessage(); }
    }


    public boolean upload(String localName, String remoteName)
    {
        if(ftp.isConnected() && connected)
        {
            try {
                FileInputStream file = new FileInputStream(localName);
                boolean result = ftp.storeFile(remoteName, file);
                if(result) { return true; }
                else { return false; }
            } 
            catch (FileNotFoundException e) { error = e.getMessage(); return false; } 
            catch (IOException e) { error = e.getMessage(); return false; }
        }
        return false;
    }

    public boolean upload(File localName, String remoteName)
    {
        if(ftp.isConnected() && connected)
        {
            try {
                FileInputStream file = new FileInputStream(localName.getAbsolutePath());
                boolean result = ftp.storeFile(remoteName, file);
                if(result) { return true; }
                else { return false; }
            } 
            catch (FileNotFoundException e) { error = e.getMessage(); return false; } 
            catch (IOException e) { error = e.getMessage(); return false; }
        }
        return false;
    }

    public boolean download(String remote, String local)
    {
        //TODO Put appropriate code here
        return false;
    }


    public boolean close()
    {
        try {
            ftp.disconnect();
            return true;
        } catch (IOException e) {
            error = e.getMessage();
            return false;
        }
    }

    public String error()
    {
        return error;
    }

}

我想知道的是如何将我的FTP功能放入ASync任务中，以便我可以在后台活动中运行它并更新进度条，还可以指示它到目前为止上传了多少字节？

干杯

修改代码本身现在正常工作，我只需要知道如何将其变成异步任务

Answer 1

不确定您是否在询问如何使用AsyncTask，但如果您在这里是关于使用AsyncTask向Web服务发出请求的教程。这可以很容易地扩展到后台执行FTP。 AsyncTask也可以支持Progress，虽然我不认为它在教程中提到过。

基本上，您的upload函数需要移至doInBackground，连接代码也是如此。见http://geekjamboree.wordpress.com/2011/11/22/asynctask-call-web-services-in-android/

将FTP命令转为ASync Task？

1 个答案: