public static File getDir() {
    File sdDir = getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
    return new File(sdDir, "MyPics");
}

public static boolean writeFile(byte[] data, String fileName, Context context) {
    File pictureFileDir = getDir();

    if (!pictureFileDir.exists() && !pictureFileDir.mkdirs()) {
        Toast.makeText(context, "CANT CREATE", Toast.LENGTH_SHORT).show();
    }

    String photoFile = fileName + ".jpg";
    String fullPath = pictureFileDir.getAbsolutePath() + File.separator + photoFile;
    File pictureFile = new File(fullPath);

    Toast.makeText(context, "FULL PATH: "+fullPath, Toast.LENGTH_SHORT).show(); // This returns "/storage/emulated/0/Pictures/MyPics/FILENAME.jpg"


    try {
        FileOutputStream fos = new FileOutputStream(pictureFile);
        fos.write(data);
        fos.close();
    } catch (Exception error) {
        Toast.makeText(context, "File "+fullPath+ "not saved", Toast.LENGTH_SHORT).show();
        return false;
    }

    return true;
}