我想在下载 PDF 文件时从网站检索原始文件名，而不是重命名它，而是将其保存为目录 SD/Android/Data/(MyAPP)/Files 下的相同名称。到目前为止，我必须告诉 android 文件名在查找时应该是什么以及在下载时将其保存为什么。有没有一种简单的方法可以更改它以将其保存为原始名称？谢谢
private void startDownload() {
String isFileThere = Environment.getExternalStorageDirectory()
+ "/Android/Data/" + getApplicationContext().getPackageName()
+ "/files/xxxxxxxx.pdf";
File f = new File(isFileThere);
if (f.exists()) {
mProgressDialog.setProgress(0);
showPdf();
} else {
DownloadFile downloadFile = new DownloadFile();
downloadFile
.execute(url);
}
}
class DownloadFile extends AsyncTask<String, Integer, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
mProgressDialog.show();
}
@Override
protected void onProgressUpdate(Integer... progress) {
super.onProgressUpdate(progress);
mProgressDialog.setProgress(progress[0]);
}
@Override
protected String doInBackground(String... aurl) {
try {
URL url = new URL(aurl[0]);
URLConnection connection = url.openConnection();
connection.connect();
int fileLength = connection.getContentLength();
int tickSize = 2 * fileLength / 100;
int nextProgress = tickSize;
Log.d(
"ANDRO_ASYNC", "Lenght of file: " + fileLength);
InputStream input = new BufferedInputStream(url.openStream());
String path = Environment.getExternalStorageDirectory()
+ "/Android/Data/"
+ getApplicationContext().getPackageName() + "/files";
File file = new File(path);
file.mkdirs();
File outputFile = new File(file, "xxxxxxxx.pdf");
OutputStream output = new FileOutputStream(outputFile);
byte data[] = new byte[1024 * 1024];
long total = 0;
int count;
while ((count = input.read(data)) != -1) {
total += count;
if (total >= nextProgress) {
nextProgress = (int) ((total / tickSize + 1) * tickSize);
this.publishProgress((int) (total * 100 / fileLength));
}
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
mProgressDialog.setProgress(0);
mProgressDialog.dismiss();
} catch (Exception e) {
}
return null;
}
{
}
@Override
protected void onPostExecute(String unused) {
File file = new File(Environment.getExternalStorageDirectory()
+ "/Android/Data/"
+ getApplicationContext().getPackageName()
+ "/files/" + "xxxxxxxx.pdf");
Intent testIntent = new Intent(Intent.ACTION_VIEW);
testIntent.setType("application/pdf");
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
Uri uri = Uri.fromFile(file);
intent.setDataAndType(uri, "application/pdf");
try {
startActivity(intent);
} catch (ActivityNotFoundException e) {
Toast.makeText(atcChoice.this,
"No PDF viewer is available, please download one from Play store",
Toast.LENGTH_LONG).show();
}
}
}