android - 实现 GCM 客户端的 GoogleCloudMessaging API

Question

你好，我正在按照 android 的官方文档发送推送通知，因为旧方法已被弃用，但我在实现 GCM 客户端时遇到问题

http://developer.android.com/google/gcm/client.html

教程就写到这里了，往下翻看

private void registerInBackground()

当我在我的应用程序上写这个函数时它给我这个错误

Syntax error on token "void", @ expected

我用谷歌搜索了一下，现在我知道了这个错误，因为这个方法试图在一个方法内部创建一个方法，但我仍然很困惑，因为它是官方文档，我一定做错了什么，有人能指出来吗？这是本教程中的方法:

private void registerInBackground() {
    new AsyncTask() {
        @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.
                // The request to your server should be authenticated if your app
                // is using accounts.
                sendRegistrationIdToBackend();

                // 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;
        }

        @Override
        protected void onPostExecute(String msg) {
            mDisplay.append(msg + "\n");
        }
    }.execute(null, null, null);
    ...
    /**
     * Sends the registration ID to your server over HTTP, so it can use GCM/HTTP
     * or CCS to send messages to your app. Not needed for this demo since the
     * device sends upstream messages to a server that echoes back the message
     * using the 'from' address in the message.
     */
    private void sendRegistrationIdToBackend() {
      // Your implementation here.
    }
}

现在看到 sendRegistrationIdToBackend 位于方法本身内部，有什么帮助吗？

Answer 1

这是我找到的解决方案，令人失望的是，有 33 人查看了它，但无论如何都没有人愿意回答，这里是代码

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.
                    sendRegistrationIdToBackend();

                    // 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;
            }

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