Introduction: Create, read, delete, append, encrypt files and more, on internal or external disk spaces with a really simple API
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Library to create, read, delete, append, encrypt files and more, on internal or external disk spaces with a really simple API.

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dependencies {
    compile 'com.snatik:storage:2.1.0'

Don't forget to update AndroidManifest.xml and add next line:

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


// init
Storage storage = new Storage(getApplicationContext());

// get external storage
String path = storage.getExternalStorageDirectory();

// new dir
String newDir = path + File.separator + "My Sample Directory";

Check all options, scroll down ;)

Sample app

The app has some simple UI screens and uses the storage library. This is just an example of what can be done with this lib.



Storage storage = new Storage(getApplicationContext());

Work on External Storage.

  • Check if external writable

      boolean isWritable = storage.isExternalWritable();
  • Root external storage path

      String path = storage.getExternalStorageDirectory();
  • If you want to use a particular public directory

      Storage storage = SimpleStorage.getExternalStorage(Environment.DIRECTORY_PICTURES);

Work on Internal Storage.

  • Directory for storing app internal files (documentation):

      String path = SimpleStorage.getInternalFilesDirectory();
  • Cache dir

      String path = SimpleStorage.getInternalCacheDirectory();
  • Root internal storage dir

      String path = SimpleStorage.getInternalRootDirectory();

Create directory

  • Create directory

  • Create directory and override the existing one.

      storage.createDirectory(path, true);

Create file

Create a new file with the content in it.

storage.createFile(path, "some content of the file");

The content of the file can be one of the next types:

  • String
  • byte[]
  • Bitmap
  • Storable

Read file

Read the content of any file to byte array.

byte[] bytes = storage.readFile(path);

Read the content of the file to String.

String content = storage.readTextFile(path);

Append content to file

storage.appendFile(path, "more new data");

You can append:

  • String
  • byte[]


storage.copy(fromPath, toPath);


storage.move(fromPath, toPath);

Delete directory


Delete file


Get files

  • Get files in ordered way by: name, date, size

      List<File> files = storage.getFiles(path, OrderType.DATE);
  • Get files and filter by regular expression:

      String regex = ...;
      List<File> files = storage.getFiles(path, regex);
  • Get all nested files (without the directories)

      List<File> files = storage.getNestedFiles(path);


  • Is directory exists

      boolean dirExists = storage.isDirectoryExists(path);
  • Is file exists

      boolean fileExists = storage.isFileExist(path);

Security configuration

You can write and read files while the content is encrypted. It means, that no one can read the data of your files from external or internal storage.

You will continue using the same api as before. The only thing you need to do is to configure the Simple Storage library before the you want to create/read encrypted data.

// set encryption
String IVX = "abcdefghijklmnop"; // 16 lenght - not secret
String SECRET_KEY = "secret1234567890"; // 16 lenght - secret
byte[] SALT = "0000111100001111".getBytes(); // random 16 bytes array

// build configuratio
EncryptConfiguration configuration = new EncryptConfiguration.Builder()
    .setEncryptContent(IVX, SECRET_KEY, SALT)

// configure the simple storage

Now, you can create a new file with content and the content will be automatically encrypted.
You can read the file and the content will be decrypted.


Create file with next content "this is the secret data":

storage.createFile(path, "this is the secret data");

If we open the file to see it's content then it we will something like this: „f°α�ΤG†_iΐp . It looks good :)

And now, read the file data with the same api:

String content = storage.readTextFile(path);

You will see that the content will be: "this is the secret data".


Just play and check the sample app ;)

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