java - Facebook 邀请 - 几个小时后很少收到邀请

Question

我已经在android中完成了“使用facebook邀请用户使用应用程序”的任务，如果我发送邀请，使用下面的代码，邀请消息在几个小时后很少发送，或者没有发送，有人知道吗？解决方案？

final ImageView facebook1 = (ImageView) findViewById(R.id.facebook1);
        facebook1.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v){


            Facebook mFacebook = new Facebook( APP_ID );

            Bundle params = new Bundle();

            params.putString("message", "Prova ");
            mFacebook.dialog(Singlemenuitem.this, "apprequests", params, new DialogListener() {
                            public void onComplete(Bundle values) {
                                                Toast toast = Toast.makeText(getApplicationContext(), "Done",
                                                        Toast.LENGTH_SHORT);
                                                toast.show();
                                            }

                                            public void onFacebookError(FacebookError error) {
                                                Toast.makeText(getApplicationContext(), "Facebook Error: " + error.getMessage(),
                                                        Toast.LENGTH_SHORT).show();
                                            }

                                            public void onCancel() {
                                                Toast toast = Toast.makeText(getApplicationContext(), "App request cancelled",
                                                        Toast.LENGTH_SHORT);
                                                toast.show();
                                            }

                                            public void onError(DialogError e) {
                                                // TODO Auto-generated method stub

                                            }
                                        });
              } });