創建GCM客戶端應用程序，asynctask失敗

在創建GCM客戶端應用程序時，asynctask正在給出編譯錯誤。 OnCreate我們正在調用registerBackgrouod，它將檢查gcm實例是否正在運行，如果沒有創建一個。創建GCM客戶端應用程序，asynctask失敗

但asyntask是給錯誤：「的AsyncTask不能被解析爲一個類型」

private void registerBackground() { 
    new AsyncTask() { 
     protected String doInBackground(Void... params) { 
      String msg = ""; 
      try { 
       if (gcm == null) { 
        gcm = GoogleCloudMessaging.getInstance(context); 
       } 
       regid = gcm.register(SENDER_ID); 
       msg = "Device registered, registration id=" + regid; 
       // You should send the registration ID to your server over HTTP, 
       // so it can use GCM/HTTP or CCS to send messages to your app. 
       // For this demo: we don't need to send it because the device 
       // will send upstream messages to a server that echo back the message 
       // using the 'from' address in the message. 

       // Save the regid - no need to register again. 
       setRegistrationId(context, regid); 
      } catch (IOException ex) { 
       msg = "Error :" + ex.getMessage(); 
      } 
      return msg; 
     } 


     protected void onPostExecute(String msg) { 
      mDisplay.append(msg + "\n"); 
     } 
    }.execute(null, null, null);

來源

2013-07-15 John

應該是'新的AsyncTask <太虛，太虛， String>（）' – AlexBcn

它沒有工作，使用線程和thread.start（）而不是asynctask工作。 – John

Android文檔已損壞。跟蹤器中有一個錯誤報告，但我不知道他們什麼時候會修復它。 – Xeos

-1

這是因爲，則params的你傳遞給異步任務。對於進一步的幫助：我最近上傳的功能齊全的GCM Java客戶端，以我的Github上的帳戶： GCM Android Client

它得到了服務器和客戶端實現。

來源

2014-04-06 20:33:22

正如AlexBcn所觀察到的，並且根據AsyncTask的文檔，您將傳遞給AsyncTask三種類型作爲參數。因爲要返回GCM推送通知的有效載荷爲一個字符串，你會調用AsyncTask<Void, Void, String>

所以GCM客戶端的正確的代碼片段是：

private void registerInBackground() { 
     new AsyncTask<Void, Void, String>() { 
     @Override 
     protected String doInBackground(Void... params) { 
      String msg = ""; 
      try { 
       if (gcm == null) { 
        gcm = GoogleCloudMessaging.getInstance(context); 
       } 
       regid = gcm.register(SENDER_ID); 
       msg = "Device registered, registration ID=" + regid; 

       // You should send the registration ID to your server over HTTP, so it 
       // can use GCM/HTTP or CCS to send messages to your app. 
       // For this demo: we don't need to send it because the device will send 
       // upstream messages to a server that echo back the message using the 
       // 'from' address in the message. 

       // Persist the regID - no need to register again. 
       storeRegistrationId(context, regid); 
      } catch (IOException ex) { 
       msg = "Error :" + ex.getMessage(); 
       // If there is an error, don't just keep trying to register. 
       // Require the user to click a button again, or perform 
       // exponential back-off. 
      } 
      return msg; 
     }.execute(null, null, null); 
    }

來源

2014-11-18 12:53:14 bluesman

創建GCM客戶端應用程序，asynctask失敗

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