使用Asynctask進行GCM註冊時出錯

Question

我使用開發人員網站上的相同代碼，但在編譯時出錯。 http://developer.android.com/google/gcm/gs.html

複製下列

private void registerBackground() { 
new AsyncTask() { 
    @Override 
    protected String doInBackground(Void... params) { 
     String msg = ""; 
     try { 
      regid = gcm.register(GCM_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 will echo back 
      // the message using the 'from' address in the message. 

      // Save the regid for future use - no need to register again. 
      SharedPreferences.Editor editor = prefs.edit(); 
      editor.putString(PROPERTY_REG_ID, regid); 
      editor.commit(); 
     } catch (IOException ex) { 
      msg = "Error :" + ex.getMessage(); 
     } 
     return msg; 
    } 
    // Once registration is done, display the registration status 
    // string in the Activity's UI. 
    @Override 
    protected void onPostExecute(String msg) { 
     mDisplay.append(msg + "\n"); 
    } 
}.execute(null, null, null); 
} 

我得到的錯誤編制說明「的AsyncTask是原始類型。參考泛型類型應該paramterised代碼。

Answer 1

您還沒有宣佈泛型類型參數。

變化

new AsyncTask() { 

到

new AsyncTask<Void,Void,String>() { 

和此外，

execute(null, null, null); 

可改爲

execute();