how to get the file names stored in sd card in android

问题

i have a folder in sd card which contains several files. now i need to get the names of that files. can anybody have any idea how to get the file names stored in sd card?

any help will be appreciative. thanks a lot.

回答1:

Environment.getExternalStorageDirectory will give you a File corresponding to the SDCARD. Then you'll just have to use File methods.

That should be something like that :

File sdCardRoot = Environment.getExternalStorageDirectory();
File yourDir = new File(sdCardRoot, "yourpath");
for (File f : yourDir.listFiles()) {
    if (f.isFile())
        String name = f.getName();
        // make something with the name
}

A little note of advice : from KitKat and above, this requires the READ_EXTERNAL_STORAGE permission.

回答2:

/**
 * Return list of files from path. <FileName, FilePath>
 *
 * @param path - The path to directory with images
 * @return Files name and path all files in a directory, that have ext = "jpeg", "jpg","png", "bmp", "gif"  
 */
private List<String> getListOfFiles(String path) {

    File files = new File(path);

    FileFilter filter = new FileFilter() {

        private final List<String> exts = Arrays.asList("jpeg", "jpg",
                "png", "bmp", "gif");

        @Override
        public boolean accept(File pathname) {
            String ext;
            String path = pathname.getPath();
            ext = path.substring(path.lastIndexOf(".") + 1);
            return exts.contains(ext);
        }
    };

    final File [] filesFound = files.listFiles(filter);
    List<String> list = new ArrayList<String>();
    if (filesFound != null && filesFound.length > 0) {
        for (File file : filesFound) {
           list.add(file.getName());
        }
    }

    return list;
}

This will give you the list of images in a folder. You can modify the code to get all files.

回答3:

In Android 5.0 Lollipop, I found that we need add the permission to Manifest:

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

If not, we could not see any file in sdcard. I take an hour to find this!

回答4:

 ArrayList<String>nameList = new ArrayList<String>();
 File yourDir = new File(Environment.getExternalStorageDirectory(), "/myFolder");
 for (File f : yourDir.listFiles()) 
 {
    if (f.isFile())
    {
       nameList.add(f.getName);
    }

}

回答5:

If you want to retrieve all files and folder from a specific path of FOLDER then use this code it will help you

String path="/mnt/sdcard/dcim";  //lets its your path to a FOLDER

String root_sd = Environment.getExternalStorageDirectory().toString();
File file = new File(path) ;       
File list[] = file.listFiles();
  for(File f:list)
    {
       filename.add(f.getName());//add new files name in the list
     }

来源：https://stackoverflow.com/questions/4561217/how-to-get-the-file-names-stored-in-sd-card-in-android

标签

java

android

file

sd-card