Question

我试图从URL下载mp3文件并将SD保存在音乐文件夹中。但无论我做什么，都不会将它保存在SD上，它只是下载它，然后在试图找到它时，它没有发现它。

这是我在异步任务类中的代码：

protected String doInBackground(String... params) {
try{
URL url = new URL(params[0]);
HttpURLConnection connection = (HttpURLConnection)       url.openConnection();
            connection.setRequestMethod("GET");
            connection.setDoOutput(true);
            connection.connect();

            File sd = Environment.getExternalStorageDirectory();
            File file = new File(sd, "TestSongs.mp3");


            FileOutputStream outputStream = new FileOutputStream(file);
            InputStream inputStream = connection.getInputStream();
            int totalsize = connection.getContentLength();
            int downloadSize = 0;

            byte[] buffer = new byte[1024];
            int bufferLength = 0;
            while((bufferLength = inputStream.read(buffer)) > 0) {
                outputStream.write(buffer, 0 , bufferLength);
                downloadSize += bufferLength;
                publishProgress("" + (int) ((downloadSize * 100) / totalsize));
            }
            outputStream.close();

        }catch(Exception e) {
            Log.d(TAG, e.getMessage());
        }
        return null;
    }

Answer 1

添加

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

在您的清单中的某个位置，<application></application>标记

之外

将mp3文件保存为sd

1 个答案: