Question

我正在开发一款Android应用，允许用户从列表视图中选择文件并下载。我有一个AsyncTask来获取文件，每个文件设置一个onClickListener，允许在用户点击它时下载该文件。我有互联网，但我无法通过AsynTask让下载管理员工作。任何帮助都会被贬低。

Answer 1

以下是一个简单的例子：

        btnDown.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {


            String dir = Environment.DIRECTORY_MUSIC;
            dir += "/klp";
            File fileDir = new File(dir);
            if (!fileDir.isDirectory()) {
                fileDir.mkdir();
            }


            Toast.makeText(Detail.this, "Download song " + name, Toast.LENGTH_SHORT).show();
            // Download File
            DownloadManager.Request request = 
                    new DownloadManager.Request(Uri.parse(url));
            request.setDescription(nameFile);
            request.setTitle(name);
            // in order for this if to run, you must use the android 3.2 to compile your app
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
                request.allowScanningByMediaScanner();
                request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
            }
            request.setDestinationInExternalPublicDir(dir, nameFile);


            // get download service and enqueue file
            DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
            manager.enqueue(request);   


        }
    });

使用AsyncTask下载管理器下载文件

1 个答案: