Check if directory exist on android's sdcard

Question

How do I check if a directory exist on the sdcard in android?

Solution 1

Regular Java file IO:

File f = new File(Environment.getExternalStorageDirectory() + "/somedir");
if(f.isDirectory()) {
   ....

Might also want to check f.exists(), because if it exists, and isDirectory() returns false, you'll have a problem. There's also isReadable()...

Check here for more methods you might find useful.

Solution 2

File dir = new File(Environment.getExternalStorageDirectory() + "/mydirectory");
if(dir.exists() && dir.isDirectory()) {
    // do something here
}

Solution 3

The following code also works for java files:

// Create file upload directory if it doesn't exist    
if (!sdcarddir.exists())
   sdcarddir.mkdir();

Solution 4

General use this function for checking is a Dir exists:

public boolean dir_exists(String dir_path)
  {
    boolean ret = false;
    File dir = new File(dir_path);
    if(dir.exists() && dir.isDirectory())
      ret = true;
    return ret;
  }

Use the Function like:

String dir_path = Environment.getExternalStorageDirectory() + "//mydirectory//";

if (!dir_exists(dir_path)){
  File directory = new File(dir_path); 
  directory.mkdirs(); 
}

if (dir_exists(dir_path)){
  // 'Dir exists'
}else{
// Display Errormessage 'Dir could not creat!!'
}

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Comments

[Alxandr]

My error just turned out to be a lacking directory in my path, but thanks. I began to wonder if android's filesystem didn't support normal methods like this :-P

[Chrispix]

Just a note, getExternalStorageDirectory() May not actually point to the physical sd_card, it could point to internal storage. developer.android.com/reference/android/os/…

[Yash]

Chrispix, your comment is misleading. getExternalStorageDirectory() will point to the storage which shares data across all applications. This could be the SD Card, and for devices without SD Cards it points to the reserved storage area that is used as external storage. Internal storage is where private data (to the application - usually data/data) is stored.

[Luis A. Florit]

This doesn't work for me, since getExternalStorageDirectory() it returns the internal storage.

[ABS]

There is no "isReadable" method! Unfortunately only a "setReadable" method is available, not even "getReadable"!!! So how we can get this value?!

[Muhammad Babar]

Might also want to check f.exists(), because if it exists, and isDirectory() returns false, you'll have a problem? can you please elaborate? why would isDirectory() returns false when it actually exists?

[synic]

@muhammad: it might exist and just be a file, instead of a directory.

[Mann]

Is it necessary to check both if exists() and isDirectory() ? I mean what if we use any one of them ?