List all the files from all the folder in a single list

Question

Hi I am looking for the solution to list all the files from root/Android device.

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..

Now If am using

       File f=new File("/sdcard"); 

Then it will list all the files from the sdcard folder only..and If I will use

       File f=new File("/download"); 

Then it will list all the files from download folder only ..and if I will use

       File f=new File("/"); 

Then it will list only root direcoty files...not the files inside /sdcard or /download..

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.

Thanks..

Answer 1

Try this:

 .....  List<File> files = getListFiles(new File("YOUR ROOT"));   ....  private List<File> getListFiles(File parentDir) {     ArrayList<File> inFiles = new ArrayList<File>();     File[] files = parentDir.listFiles();     for (File file : files) {         if (file.isDirectory()) {             inFiles.addAll(getListFiles(file));         } else {             if(file.getName().endsWith(".csv")){                 inFiles.add(file);             }         }     }     return inFiles; } 

or variant without recursion:

private List<File> getListFiles2(File parentDir) {     List<File> inFiles = new ArrayList<>();     Queue<File> files = new LinkedList<>();     files.addAll(Arrays.asList(parentDir.listFiles()));     while (!files.isEmpty()) {         File file = files.remove();         if (file.isDirectory()) {             files.addAll(Arrays.asList(file.listFiles()));         } else if (file.getName().endsWith(".csv")) {             inFiles.add(file);         }     }     return inFiles; }