如何在Android中重命名下载的文件

Question

1. I'm creating file using Async task the file name is "Book" as my below code
2. When I'm downloading data on that time, I'm creating a file named "Book" once the download finishes. Now how do I change the file name "Book" into some other name in onPostExecute method?

 public class MyDownloaderAsyncTask extends AsyncTask<String, Void, Boolean> { private DownloadManager.DownloadCompletedListner mListner; public BookProperties mBookDetails; public MyDownloaderAsyncTask(DownloadManager.DownloadCompletedListner listener, BookProperties bookdetails) { mListner = listener; mBookDetails = bookdetails; } @Override protected Boolean doInBackground(String... strings) { Log.i(TAG, "Success Download canceled 1111"); String tMainFolder = String.valueOf(BaseApplication.getInstance().getAppContext().getDir("MonnFamily", Context.MODE_PRIVATE)); tMainFolder += "/Book" + mBookDetails.getBookId(); //file which download name Log.i(TAG, "Assynctask Ma" + tMainFolder); Log.i(TAG, "book id and book name" + mBookDetails.getBookId() + mBookDetails.getBookName()); downloadBookDetails(tMainFolder, ContentfulConstants.BOOK_MAIN_IMAGE + ".png", mBookDetails.getBookMainImage()); downloadBookDetails(tMainFolder, ContentfulConstants.BOOK_MAIN_AUDIO + ".mp3", mBookDetails.getBookSound()); for (PageDetailProperties pageDetails : mBookDetails.getPageDetail()) { String tPageNumber = pageDetails.getPageNumber().toString(); downloadBookDetails(tMainFolder, ContentfulConstants.PAGE_IMAGE + tPageNumber + ".png", pageDetails.getPageImage()); downloadBookDetails(tMainFolder, ContentfulConstants.PAGE_AUDIO + tPageNumber + ".mp3", pageDetails.getPageAudio()); downloadBookDetails(tMainFolder, ContentfulConstants.PAGE_TEXT + tPageNumber + ".txt", pageDetails.getPageText()); } return true; } protected void onPostExecute(Boolean result) { Log.i(TAG, "Execute Download befor"); //This is run on the UI thread so you can do as you wish here if (result) { Log.i(TAG, "Success Download"); ((LibraryView) BaseApplication.getInstance().getCurrentActivity()).hideActivityView(); mListner.downloadCompleted(); // mBookDetails = pBook; // // mBookDetails = pBook; // String tMainFolder = String.valueOf(BaseApplication.getInstance().getAppContext().getDir("MonnFamily", Context.MODE_PRIVATE)); // Log.i(TAG, "Book downloadBookData" + tMainFolder); // tMainFolder += "/Book" + mBookDetails.getBookId(); // tMainFolder +="/BookDownload" + mBookDetails.getBookId(); // Log.i(TAG, "Post Assync in DownloadManager" + tMainFolder); // // File directory = new File(tMainFolder); // File directory1 = new File(tMainFolder); // if (directory.exists()) { // directory.renameTo(directory1); // Log.i(TAG, "Download Manager Directory" + directory1); // } } } private void downloadBookDetails(String pMainFolder, String pFileName, String pDownloadURL) { Log.i(TAG, "Coming to this downloadBookDetails "); try { URL url = new URL(pDownloadURL); Log.i(TAG, "pDownload URL"+ url); URLConnection ucon = url.openConnection(); ucon.setReadTimeout(5000); ucon.setConnectTimeout(10000); InputStream is = ucon.getInputStream(); BufferedInputStream inStream = new BufferedInputStream(is, 1024 * 5); File directory = new File(pMainFolder, pFileName); Log.i(TAG, "File Name dir" + directory); FileOutputStream outStream = new FileOutputStream(directory); byte[] buff = new byte[5 * 1024]; int len; while ((len = inStream.read(buff)) != -1) { outStream.write(buff, 0, len); } outStream.flush(); outStream.close(); inStream.close(); } catch (Exception e) { //Add Network Error. Log.i(TAG, "Download Error Exception " + e.getMessage()); e.printStackTrace(); } } 

Answer 1

new File（“ / Book” + mBookDetails.getBookId（））。renameTo（new File（“ / BookDownload” + mBookDetails.getBookId（））

Answer 2

use this working example to rename the File

File sdcard=new File(tMainFolder+"/Book/");
File old=new File(sdcard,mBookDetails.getBookId());
File to = new File(sdcard, "renamefile.jpg");
boolean success=old.renameTo(to);