PermissionManager() {
	// Empty constructor
}

// Requestcode for the permissions
public static final int REQUEST_CODE_GALLERY = 1992;
// initialize the subject
private PublishSubject<Boolean> mediaPermissionSubject = PublishSubject.create();

 /**
  * Function to check for permissions.
  * @param activity -Activity from which the permissions are requested
  * @return boolean observable - Observable which emits booleans
  */

public Observable<Boolean> checkForMediaPermissions(Activity activity) {
        if (checkPermissions(activity, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE})) {
            return Observable.just(true);
        }

        ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
                REQUEST_CODE_GALLERY);
        return mediaPermissionSubject;
    }

 /**
  * Function to pass onRequestPermissionResult callback results.
  *
  * @param int - requestcode
  * @param String[] - array of permissions
  * @param int[] - the array of grantresults
  */

public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[]
            grantResults) {
        switch (requestCode) {
            case REQUEST_CODE_GALLERY:
                mediaPermissionSubject.onNext(checkAllPermissionsGranted(grantResults));
                break;
        }
    }

/**
  * Helper Function to check permissions.
  *
  * @param activity - activity from which the permissions are requested
  * @param String[] - array of permissions
  */

private boolean checkPermissions(Activity activity, @NonNull String[] permissions) {
        for (String permission : permissions) {
            if (ActivityCompat.checkSelfPermission(activity, permission) != PackageManager.PERMISSION_GRANTED) {
                return false;
            }
        }
        return true;
    }

/**
 * Helper Function to remove subscriptions.
 */

public void removeSubscriptions(){
        mediaPermissionSubject.unsubscribeOn(AndroidSchedulers.mainThread());
    }