应用程序不会将GCM注册ID发送到服务器

Question

我使用示例代码来学习，但RegID不发送到服务器。该调用是正确的，因为服务器接受它，没有错误，并在数据库中添加一行，但regid字符串为空。我在代码上研究了几个小时，但无法弄清楚什么是错误的。

MainActivity

GCMRegistrar.checkDevice(this); 
    GCMRegistrar.checkManifest(this); 
    final String regId = GCMRegistrar.getRegistrationId(this); 
    if (!regId.equals("")) { 
     sendIdToServer(regId); 
    } else { 
     GCMRegistrar.register(this, Constants.SENDER_ID); 
    } 

    ... 

    private void sendIdToServer(String regId) { 
    String status = getString(R.string.gcm_registration, regId); 
    mStatus.setText(status); 
    (new SendRegistrationIdTask(regId)).execute(); 
    } 

    ... 

    private final class SendRegistrationIdTask extends 
     AsyncTask<String, Void, HttpResponse> { 
    private String mRegId; 

    public SendRegistrationIdTask(String regId) { 
     mRegId = regId; 
    } 

    @Override 
    protected HttpResponse doInBackground(String... regIds) { 
     String url = Constants.SERVER_URL; 
     HttpPost httppost = new HttpPost(url); 

     try { 
     List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1); 
     nameValuePairs.add(new BasicNameValuePair("regid", mRegId)); 
     httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); 
     HttpClient httpclient = new DefaultHttpClient(); 
     return httpclient.execute(httppost); 
     } catch (ClientProtocolException e) { 
     Log.e(Constants.TAG, e.getMessage(), e); 
     } catch (IOException e) { 
     Log.e(Constants.TAG, e.getMessage(), e); 
     } 

     return null; 
    } 

    @Override 
    protected void onPostExecute(HttpResponse response) { 
     if (response == null) { 
     Log.e(Constants.TAG, "HttpResponse is null"); 
     return; 
     } 

     StatusLine httpStatus = response.getStatusLine(); 
     if (httpStatus.getStatusCode() != 200) { 
     Log.e(Constants.TAG, "Status: " + httpStatus.getStatusCode()); 
     mStatus.setText(httpStatus.getReasonPhrase()); 
     return; 
     } 

     String status = getString(R.string.server_registration, mRegId); 
     mStatus.setText(status); 
    } 
    } 

Answer 1

如果你能确认（调试），其mRegId在这条线的值：

nameValuePairs.add(new BasicNameValuePair("regid", mRegId)); 

然后下一行改变：

httpost.setEntity(new UrlEncodedFormEntity(nameValuePairs, HTTP.UTF_8)); 

到设置显式编码。