I just modify some coding for your FB login.

private void performPostImageOnWall(){
  
    final Session.NewPermissionsRequest newPermissi Session.NewPermissionsRequest(this, Arrays.asList("publish_actions"));
       Session openActiveSessi false, new Session.StatusCallback() {
          @Override
          public void call(Session session, SessionState state, Exception exception){
              Log.d("FACEBOOK", "call");
              
              System.out.println("isFetching "+isFetching+", session.isOpened()"+session.isOpened());
              
              if (session.isOpened() && !isFetching){
                  Log.d("FACEBOOK", "if (session.isOpened() && !isFetching)");
                  isFetching = true;
                  session.requestNewReadPermissions(newPermissionsRequest);
                  
                  Request postPicture = Request.newUploadPhotoRequest(session, bmp, new Request.Callback() {
       
       @Override
       public void onCompleted(Response response) {
        // TODO Auto-generated method stub
        System.out.println("response "+response.toString());
         JSONObject graphResp
        System.out.println("graphResponse "+graphResponse.toString()); 
       }
      });
                  postPicture.executeAsync();
              }else {
                  if (!session.isOpened())
                      Log.d("FACEBOOK", "!session.isOpened()");
                  else
                      Log.d("FACEBOOK", "isFetching");
              }
          }
      });
 }