public boolean isStoragePermissionGranted(){
        if (Build.VERSION.SDK_INT >= 23) {
            if (checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED){
                Log.v("LOG", "Permission granted");
                return true;
            } else {
                Log.v("LOG", "Permission revoked");
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
                return false;
            }
        }else{
            Log.v("LOG", "Permission is granted");
            return true;
        }
    }