Android Core API：下载/读取文件

Question

我使用Dropbox Core API连接我的Android应用程序。但是我无法从dropbox下载/读取文件。

我使用以下代码下载并阅读文件，但它不起作用。

  FileOutputStream outputStream = null;
 try {
     File file = new File("/path/to/new/user.txt");
     outputStream = new FileOutputStream(file);
     mDBApi.getFile("/user.txt", null, outputStream, null);
 } catch (Exception e) {
     System.out.println("Something went wrong: " + e);
 } finally {
     if (outputStream != null) {
         try {
             outputStream.close();
         } catch (IOException e) {}
     }
 }
//This line of code reads the content of the local file that we downloaded
 InputStream instream = new FileInputStream("/path/to/new/usertxt.php");
 InputStreamReader inputreader = new InputStreamReader(instream);
 BufferedReader buffreader = new BufferedReader(inputreader);
 mTestOutput.setText(buffreader.readLine());

我收到以下错误

Something went wrong: java.io.FileNotFoundException: /path/to/new/user.txt: open failed: ENOENT (No such file or directory)

有人可以给我看一个有效的示例代码吗？