title: List all the files from all the folder in a single list
body: <p>Hi I am looking for the solution to list all the files from root/Android device.</p>
  
  <p>Suppose there are 3 folder inside root directory,but I want to display all the files in all of these folder in a single list..</p>
  
  <p>Now If am using </p>
  
  <pre><code>       File f=new File("/sdcard");
  </code></pre>
  
  <p>Then it will list all the files from the sdcard folder only..and If I will use</p>
  
  <pre><code>       File f=new File("/download");
  </code></pre>
  
  <p>Then it will list all the files from download folder only ..and if I will use </p>
  
  <pre><code>       File f=new File("/");
  </code></pre>
  
  <p>Then it will list only root direcoty files...not the files inside /sdcard or /download..</p>
  
  <p>So what steps shall I follow to list all the files with a filter to list only .csv files from all the folder inside root.</p>
  
  <p>Thanks..</p>