android内置mp3文件下载,Android下载mp3文件并播放它

我试图从Dropbox下载一些音频文件供用户下次没有互联网时使用，所以代码实际上下载文件，但我有麻烦播放该音频我不知道如果我要解析下载的文件什么的，希望你能帮助Android下载mp3文件并播放它

下载文件，并发挥它的类，它发挥它在后执行，或至少它试图

class DownloadFileFromURL extends AsyncTask {

/**

* Before starting background thread Show Progress Bar Dialog

*/

@Override

protected void onPreExecute() {

super.onPreExecute();

showDialog(progress_bar_type);

}

/**

* Downloading file in background thread

*/

@Override

protected String doInBackground(String... f_url) {

int count;

try {

URL url = new URL(f_url[0]);

URLConnection conection = url.openConnection();

conection.connect();

// this will be useful so that you can show a tipical 0-100%

// progress bar

int lenghtOfFile = conection.getContentLength();

// download the file

InputStream input = new BufferedInputStream(url.openStream(),

8192);

// Output stream

OutputStream output = new FileOutputStream(Environment.getExternalStorageDirectory().getPath()+"/workout.mp3");

byte data[] = new byte[1024];

long total = 0;

while ((count = input.read(data)) != -1) {

total += count;

// publishing the progress....

// After this onProgressUpdate will be called

publishProgress("" + (int) ((total * 100)/lenghtOfFile));

// writing data to file

output.write(data, 0, count);

}

// flushing output

output.flush();

// closing streams

output.close();

input.close();

} catch (Exception e) {

Log.e("Error: ", e.getMessage());

}

return null;

}

/**

* Updating progress bar

*/

protected void onProgressUpdate(String... progress) {

// setting progress percentage

pDialog.setProgress(Integer.parseInt(progress[0]));

}

/**

* After completing background task Dismiss the progress dialog

**/

@Override

protected void onPostExecute(String file_url) {

// dismiss the dialog after the file was downloaded

dismissDialog(progress_bar_type);

Uri u = Uri.parse(Environment.getExternalStorageDirectory().getPath()+"/workout.mp3");

MediaPlayer mediaPlayer = new MediaPlayer();

try {

mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);

mediaPlayer.setDataSource(Environment.getExternalStorageDirectory().getPath()+"/workout.mp3");

mediaPlayer.prepare();

} catch (IOException e) {

e.printStackTrace();

}

mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {

@Override

public void onPrepared(MediaPlayer mp) {

mp.start();

}

});

}

}

IM实际上得到的日志

05-31 11:46:11.605 4638-4650/com.example.project.calisthenic E/MediaPlayer: error (1, -2147483648)这个错误

问题是试图播放下载的文件，即使尝试播放它与Android本地播放器它说“播放器不支持这种类型的音频文件”，所以我不知道如果我' m以错误的方式下载文件o尝试以错误的方式播放文件。

我会检查和文件大小为10KB和下载后是400B所以肯定有什么不对劲的下载

+0

你面临什么麻烦？ pl发布日志，如果你有任何错误。 –