我正在开发一个Android应用程序,允许用户从列表视图中选择一个文件并下载它。我有一个获取文件的AsyncTask
,并为每个文件设置一个onClickListener
,允许用户单击该文件时下载该文件。我有整个互联网,但我不能得到一个下载管理器从AsynTask
工作。
下面是一个简单的例子:
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);
}
});