GCM注册SERVICE_NOT_AVAILABLE

Question

这真让我讨厌.我有一个使用GCM的应用程序.我有人抱怨他们因错误而无法登录.让我告诉你我是如何进行登录的:

// Login Activity
//....
public void onClickLoginButton (View v) {

    // Do some stuff...

    new GCMRegister().execute(); //AsyncTask
}

private class GCMRegister extends AsyncTask<Void, Void, Integer> {

    @Override
    protected Integer doInBackground (Void... params) {
        ConnectivityManager connMgr = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();

        if (networkInfo != null && networkInfo.isConnected()) {
            try {
                //Get GCM Registration key
                registrationId = googleCloud.register(Settings.PROJECT_NUMBER);
            } catch (Exception e) {
                Log.e("GCMRegister", e.toString());
                return -1;
            }
            return 1;
        } else {
            return -3;
        }
    }

    @Override
    protected void onPostExecute(Integer result) {
        if (result == 1) {
            new LoginAsync().execute(); // Another AsyncTask to check in my database if user is valid and save its key
        } else {
            user.setEnabled(true);
            password.setEnabled(true);
            login.setEnabled(true);
            if (result == -1) {
                Toast.makeText(Login.this, "A problem occured login in", Toast.LENGTH_LONG).show();
            } else if (result == -3) {
                Toast.makeText(Login.this, "I need an internet connection", Toast.LENGTH_LONG).show();
            }
        }
    }

所以很多人抱怨他们因为"登陆时出现问题"错误而无法登录,这表明GCM登记失败.即使我自己使用我的设备Android 4.4.2,也不能一开始就做到这一点.我需要尝试登录2到3次,直到它工作(并且我的连接很好).我的LogCat上的错误是:

08-04 21:29:10.922: E/GCMRegister(18182): java.io.IOException: SERVICE_NOT_AVAILABLE

那我的代码有什么问题？这让我疯了.

Answer 1

我们遇到了同样的问题,用户无法第一次登录,但无论网络速度如何,都可以在第二次或第三次登录后登录.

我们通过Thread.sleep多次使用和重试来完成解决方法,直到收到GCM ID.

  int noOfAttemptsAllowed = 5;   // Number of Retries allowed
  int noOfAttempts = 0;          // Number of tries done
  bool stopFetching = false;     // Flag to denote if it has to be retried or not
  String regId = "";             


  while (!stopFetching) 
  {
       noOfAttempts ++;
       GCMRegistrar.register(getApplicationContext(), "XXXX_SOME_KEY_XXXX");
       try 
       {
          // Leave some time here for the register to be 
          // registered before going to the next line
          Thread.sleep(2000);   // Set this timing based on trial.
   } catch (InterruptedException e) {
    e.printStackTrace();
   }
       try
       {
            // Get the registration ID
            regId = GCMRegistrar.getRegistrationId(LoginActivity.this);
       } catch (Exception e) {}


       if (!regId.isEmpty() || noOfAttempts > noOfAttemptsAllowed)
       {
            // If registration ID obtained or No Of tries exceeded, stop fetching
            stopFetching = true;
        }
        if (!regId.isEmpty())
        {
            // If registration ID Obtained, save to shared preferences
            saveRegIDToSharedPreferences(); 
        }


   }

注:该Thread.sleep和noOfAttemptsAllowed基于您的设计和其它参数可以玩耍了.我们的睡眠时间为7000,因此首次登记的可能性更高.但是,如果失败,下一次尝试将消耗另外7000毫秒.这可能会导致用户认为您的应用很慢.因此,使用这两个值智能地玩游戏.

Answer 2

我遇到过同样的问题.我的问题是我是在我的活动的onCreate方法上做的.我发现上下文没有完全实现导致gcm无法成功注册.我提供了getApplicationContext()来获取GCM实例,这能够解决我的问题.

例:

使用活动的上下文引起了一个问题

GoogleCloudMessaging.getInstance(ActivityName.this)

使用应用程序上下文解决了我

GoogleCloudMessaging.getInstance(getApplicationContext())