Question

我有一个FTP连接工作正常，我可以使用一个调用＆gt;的片段下载我的文件调用＆gt;的asynctaskt FTP服务器

public static void downloadDirectory(FTPClient ftpClient, String parentDir,
            String currentDir, String saveDir) throws IOException {
        String dirToList = parentDir;
        if (!currentDir.equals("")) {
            dirToList += "/" + currentDir;
        }

        FTPFile[] subFiles = ftpClient.listFiles(dirToList);

        if (subFiles != null && subFiles.length > 0) {
            for (FTPFile aFile : subFiles) {
                String currentFileName = aFile.getName();
                if (currentFileName.equals(".") || currentFileName.equals("..")) {
                    // skip parent directory and the directory itself
                    continue;
                }
                String filePath = parentDir + "/" + currentDir + "/"
                        + currentFileName;
                if (currentDir.equals("")) {
                    filePath = parentDir + "/" + currentFileName;
                }

                String newDirPath = saveDir + parentDir + File.separator
                        + currentDir + File.separator + currentFileName;
                if (currentDir.equals("")) {
                    newDirPath = saveDir + parentDir + File.separator
                            + currentFileName;
                }

                if (aFile.isDirectory()) {
                    // create the directory in saveDir
                    File newDir = new File(newDirPath);
                    boolean created = newDir.mkdirs();
                    if (created) {
                        System.out.println("CREATED the directory: "
                                + newDirPath);
                    } else {
                        System.out.println("COULD NOT create the directory: "
                                + newDirPath);
                    }

                    // download the sub directory
                    downloadDirectory(ftpClient, dirToList, currentFileName,
                            saveDir);
                } else {
                    // download the file
                    boolean success = downloadSingleFile(ftpClient, filePath,
                            newDirPath);
                    if (success) {
                        System.out.println("DOWNLOADED the file: " + filePath);
                    } else {
                        System.out.println("COULD NOT download the file: "
                                + filePath);
                    }
                }
            }
            try {
                Log.v("LogoutInformation", "Logout from FTP");
                ftpClient.logout();

            } catch (Exception e) {
                Log.e("LogoutInformation", "Logout Fail");
            }
            try {
                Log.v("DisconnectInformation", "Disconnect from FTP");
                ftpClient.disconnect();
            } catch (Exception e) {
                Log.e("DisconnectInformation", "Disconnect Fail");
            }

        }

这是我的FTPserver功能。

System.out.println("DOWNLOADED the file: " + filePath);

这就是我想要在我的片段上显示的内容，我想制作一个显示实际下载文件的Toast。但是它的后台处理，所以我无法在我的片段上显示信息，所以我不知道我该怎么做。

Answer 1

从标签开始，您使用的是AsyncTask。修改它的构造函数以接受对context的引用。

public class MyAsyncTask extends AsyncTask<..> {
    private Context mContext;
    public MyAsyncTask(Context c){
        this.mContext = c;
    }
...

当您的任务在doInBackground中运行时，您应该publishProgress(String)：

doInBackground(String.. params){
    for(something){
        ...
        publishProgress(fileName);
    }
}

publishProgress(String fName){
    Toast.makeText(mContext, name, Toast.Length_long).show();
}

Answer 2

尝试使用：

Toast.makeText(getActivity(), "File Downloaded:"+currentFileName, Toast.LENGTH_LONG).show()

Answer 3

您是否在AsyncTask类的doInBackground事件中调用downloadDirectory？

如果是这样，您可以像这样制作Toast消息：

    @Override
    protected void onPostExecute(Void result) {
       Toast.makeText(getActivity(),"DOWNLOADED the file: "+filePath,Toast.LENGTH_SHORT).show();
    }

创建filePath全局变量的位置。

这样的事情。希望它有所帮助..

Answer 4

你只需要这样做。

Handler handler = new Handler(Looper.getMainLooper());

handler.post(new Runnable() {

    @Override
    public void run() {
        Toast.makeText(context,"Your text", Toast.LENGTH_LONG).show();
    }
});

制作Toast以显示下载文件的名称

4 个答案: