1. 将音频文件下载到本地存储器：

private void downloadFile(String fileUrl) {
  try {
    URL url = new URL(fileUrl);
    HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
    urlConnection.setRequestMethod("GET");
    urlConnection.setDoOutput(true);
    urlConnection.connect();

    File audioFile = null;

    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.Q) {
      ContentResolver resolver = getContentResolver();

      ContentValues values = new ContentValues();
      values.put(MediaStore.MediaColumns.MIME_TYPE, "audio/mp3");
      values.put(MediaStore.MediaColumns.DISPLAY_NAME, "audio.mp3");
      values.put(MediaStore.Downloads.IS_PENDING, true);

      Uri audioUri = resolver.insert(MediaStore.Downloads.EXTERNAL_CONTENT_URI, values);

      if (audioUri != null) {
        OutputStream outputStream = resolver.openOutputStream(audioUri);
        if (outputStream != null) {
          InputStream inputStream = urlConnection.getInputStream();
          byte[] buffer = new byte[1024];
          int len;
          while ((len = inputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, len);
          }
          inputStream.close();
          outputStream.close();
          values.clear();
          values.put(MediaStore.Downloads.IS_PENDING, false);
          resolver.update(audioUri, values, null, null);
          audioFile = new File(audioUri.getPath());
        }
      }
    } else {
      File storageDir = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/audio");
      if (!storageDir.exists()) {
        storageDir.mkdirs();
      }
      File outputFile = new File(storageDir, "audio.mp3");
      FileOutputStream fos = new FileOutputStream(outputFile);

      BufferedInputStream bis = new BufferedInputStream(urlConnection.getInputStream());

      byte[] buffer = new byte[1024];
      int len;
      while ((len = bis.read(buffer)) != -1) {
        fos.write(buffer, 0, len);
      }

      fos.flush();
      fos.close();
      bis.close();

      audioFile = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/audio/audio.mp3");
    }

    if (audioFile != null) {
      playAudio(audioFile.getPath());
    }
  } catch