很難理解Android C2DM

Question

我已經按照Vogella C2DM教程的教程，就像大多數人試圖理解C2DM一樣，這是一個很好的教程來獲取代碼，但它並沒有真正幫助我理解如何使用它。 我已經設置了我的Android類和我的服務器（移植到php），但現在我不知道如何繼續。 我的代碼如下所示：

c2dm.php（服務器端）

 function googleAuthenticate($username, $password, $source="Company-AppName-Version", $service="ac2dm") {
    session_start();
    if( isset($_SESSION['google_auth_id']) && $_SESSION['google_auth_id'] != null)
        return $_SESSION['google_auth_id'];

    // get an authorization token
    $ch = curl_init();
    if(!ch){
        return false;
    }

    curl_setopt($ch, CURLOPT_URL, "https://www.google.com/accounts/ClientLogin");
    $post_fields = "accountType=" . urlencode('HOSTED_OR_GOOGLE')
        . "&Email=" . urlencode($username)
        . "&Passwd=" . urlencode($password)
        . "&source=" . urlencode($source)
        . "&service=" . urlencode($service);
    curl_setopt($ch, CURLOPT_HEADER, true);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $post_fields);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_FRESH_CONNECT, true);
    curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

    // for debugging the request
    //curl_setopt($ch, CURLINFO_HEADER_OUT, true); // for debugging the request

    $response = curl_exec($ch);

    //var_dump(curl_getinfo($ch)); //for debugging the request
    //var_dump($response);

    curl_close($ch);

    if (strpos($response, '200 OK') === false) {
        return false;
    }

    // find the auth code
    preg_match("/(Auth=)([\w|-]+)/", $response, $matches);

    if (!$matches[2]) {
        return false;
    }

    $_SESSION['google_auth_id'] = $matches[2];  
}

function sendMessageToPhone($authCode, $deviceRegistrationId, $msgType, $messageText) {

    $headers = array('Authorization: GoogleLogin auth=' . $authCode);
    $data = array(
        'registration_id' => $deviceRegistrationId,
        'collapse_key' => $msgType,
        'data.message' => $messageText //TODO Add more params with just simple data instead           
    );

    $ch = curl_init();

    curl_setopt($ch, CURLOPT_URL, "https://android.apis.google.com/c2dm/send");
    if ($headers)
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $data);


    $response = curl_exec($ch);

    curl_close($ch);

    return $response;
}

C2DMRegistrationReceiver.java

@Override
public void onReceive(Context context, Intent intent) {
    String action = intent.getAction();
    Log.w("C2DM", "Registration Receiver called");
    if ("com.google.android.c2dm.intent.REGISTRATION".equals(action)) {
        Log.w("C2DM", "Received registration ID");
        final String registrationId = intent
                .getStringExtra("registration_id");
        String error = intent.getStringExtra("error");

        Log.d("C2DM", "dmControl: registrationId = " + registrationId
                + ", error = " + error);
        // TODO Send this to my application server
    }
}

public void sendRegistrationIdToServer(String deviceId, String registrationId) {

    Log.d("C2DM", "Sending registration ID to my application server");
    HttpClient client = new DefaultHttpClient();
    HttpPost post = new HttpPost("myserverpage");
    try {
        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
        // Get the deviceID
        nameValuePairs.add(new BasicNameValuePair("deviceid", deviceId));
        nameValuePairs.add(new BasicNameValuePair("registrationid", registrationId));

        post.setEntity(new UrlEncodedFormEntity(nameValuePairs));
        HttpResponse response = client.execute(post);
        BufferedReader rd = 
        new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
        String line = "";
        while ((line = rd.readLine()) != null) {
        Log.e("HttpResponse", line);
    }
    } catch (IOException e) {
        e.printStackTrace();
    }
}

C2DMMessageReceiver.java

@Override
public void onReceive(Context context, Intent intent) {
    String action = intent.getAction();
    Log.w("C2DM", "Message Receiver called");
    if ("com.google.android.c2dm.intent.RECEIVE".equals(action)) {
        Log.w("C2DM", "Received message");
        final String payload = intent.getStringExtra("payload");
        Log.d("C2DM", "dmControl: payload = " + payload);
        // Send this to my application server
    }
}

在我的MainActivity中，我有

public void register() {
    Intent intent = new Intent("com.google.android.c2dm.intent.REGISTER");
    intent.putExtra("app",PendingIntent.getBroadcast(this, 0, new Intent(), 0));
    intent.putExtra("sender", "app-name@gmail.com");
    startService(intent);
}

我在應用程序啟動期間調用register（），在LogCat中調用“Message Receiver called”，而不是“Register Receiver called”。 我當然將app-name@gmail.com更改為我自己的等等，但我現在不知道如何使用代碼。 誰可以幫助我？

提前致謝！

Answer 1

關於Vogella的教程非常簡單明了。 如果您一步一步地遵循它，您將不會有這么難的理解。

您的記錄器顯示消息接收器被調用，因為這是您使用C2DMMessageReceiver記錄的內容。 如果您有另一個用於注冊的接收器，請確保在清單中聲明它並在此處發布代碼。

我建議使用相同的接收器類。 例如，這是一個簡單的onReceive方法：

if (action != null){
        // This is for registration
        if (action.equals("com.google.android.c2dm.intent.REGISTRATION")){
            Log.d(LOG_TAG, "Received registration ID");

            final String registrationId = intent.getStringExtra("registration_id");
            String error = intent.getStringExtra("error");

            Log.d(LOG_TAG, "dmControl: registrationId = " + registrationId + ", error = " + error);

            // Create a notification with the received registration id

            // Also save it in the preference to be able to show it later

            // Get the device id in order to send it to the server
            String deviceId = Secure.getString(context.getContentResolver(), Secure.ANDROID_ID);
            // .. send it to the server
        }
        // This is for receiving messages
        else if (action.equals("com.google.android.c2dm.intent.RECEIVE")){
            String payload = intent.getStringExtra("payload");
            Log.d(LOG_TAG, "Message received: " + payload);
            // .. create a notification with the new message
        }

我添加了注釋，您可以在其中添加更多操作（例如創建通知，將注冊ID發送到第三方服務器等）。 在Lars Vogel的教程中也可以找到如何執行上述操作的示例。

Answer 2

在我的情況下，我使用單接收器：

if (action.equals("com.google.android.c2dm.intent.REGISTRATION")) {
String registrationId = intent.getStringExtra("registration_id");
//do somting
} else if (intent.getAction().equals("com.google.android.c2dm.intent.RECEIVE")) {
Bundle extras = intent.getExtras();
String message = extras.getString("message");
}// end if

}

在清單中

 <receiver
  android:name=".receiverName"
 android:permission="com.google.android.c2dm.permission.SEND" >
  <intent-filter>
<action android:name="com.google.android.c2dm.intent.RECEIVE" />

<category android:name="packageName" />
</intent-filter>
<intent-filter>
<action android:name="com.google.android.c2dm.intent.REGISTRATION" />

 <category android:name="packageName" />
</intent-filter>

Answer 3

我將解釋我所理解的內容。

1. 首先，在android c2dm網站注冊，你的Android應用程序包名稱在你擁有的gmail id下說com.example.app。

2. 開發一個Android應用程序應該能夠將設備注冊ID作為請求發送到服務器。 服務器應該將這些ID存儲在db中。

3. 一旦准備好從服務器向所有設備發送一些消息，您只需要為在c2dm中注冊的gmail id和已存儲在db中的設備ID提供新的auth_token。

Vogella教程提供了用於獲取設備和auth_token的regid的示例代碼。 我已經嘗試過並將其用於我的應用程序的修改。