如何管理Android应用中的临时下载？

Question

I have an async task which in doInBackgrund is setting up a connection to perform a GET, takes the response to an OutputStream and it ends up writing a file to sd.

Such file is actually an mp3 which will be reproduced once using a MediaPlayer and forgotten, not ever used again.

This is how I'm doing it all ...

@Override
protected File doInBackground(String... params) {

    try {
        String urlString = ttsURL + URLEncoder.encode(params[0], "UTF-8");
        URL url = new URL(urlString);
        System.out.println(url.toString());

        urlConnection = (HttpURLConnection) url.openConnection();
        urlConnection.setRequestMethod("GET");
        urlConnection.setRequestProperty("User-Agent","Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.89 Safari/537.36");
        Log.d("QUERY PROPERTIES",urlConnection.getRequestProperties().toString());
        urlConnection.connect();

        if (urlConnection.getResponseCode() != 200) {

        }
        System.out.println(urlConnection.getContentEncoding() == null);
        System.out.printf(urlConnection.getResponseMessage());

        System.out.println(urlConnection.getHeaderFields().toString());
        input = urlConnection.getInputStream();
        File sdDir = getExternalStorageDirectory();
        file = sdDir + "/" + params[0] + ".mp3";
        output = new FileOutputStream(file);
        int fileLength = urlConnection.getContentLength();
        byte data[] = new byte[1024];
        long total = 0;
        int count;
        while ((count = input.read(data)) != -1) {
            total += count;
            output.write(data, 0, count);
        }

    } catch (ProtocolException e) {
        e.printStackTrace();
        return null;
    } catch (IOException e) {
        Log.e("PlaceholderFragment", "Error ", e);
        return null;

    } finally{
        if (urlConnection != null) {
            urlConnection.disconnect();

        }
    }
    Log.i("Response", "Done");
    return new File(file);
}

@Override
protected void onPostExecute(File f) {
    MediaPlayer player = new MediaPlayer();
    try {
        player.setDataSource(f.toString());
    } catch (IOException e) {
        e.printStackTrace();
    }

    try {
        player.prepare();
    } catch (IOException e) {
        e.printStackTrace();
    }

    player.start();

}

So, as it can be seen at onPostExecute , that file is being used to play the audio. Although I'm not deleting the file in the code I providing, I wonder what's best alternative for this case ... I know I could attempt to delete the file when the player it's at onPlaybackCompleted state, but I'd like a way much simple and convenient approch for temporal files.

Answer 1

使用单独的文件夹，并在确定用户离开您的应用程序后，清除该目录。