很难理解Android C2DM

Question

我已经按照Vogella C2DM教程的教程，就像大多数人试图理解C2DM一样，这是一个很好的教程来获取代码，但它并没有真正帮助我理解如何使用它。 我已经设置了我的Android类和我的服务器（移植到php），但现在我不知道如何继续。 我的代码如下所示：

c2dm.php（服务器端）

 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);
}

我在应用程序启动期间调用register（），在LogCat中调用“Message Receiver called”，而不是“Register Receiver called”。 我当然将app-name@gmail.com更改为我自己的等等，但我现在不知道如何使用代码。 谁可以帮助我？

提前致谢！

Answer 1

关于Vogella的教程非常简单明了。 如果您一步一步地遵循它，您将不会有这么难的理解。

您的记录器显示消息接收器被调用，因为这是您使用C2DMMessageReceiver记录的内容。 如果您有另一个用于注册的接收器，请确保在清单中声明它并在此处发布代码。

我建议使用相同的接收器类。 例如，这是一个简单的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
        }

我添加了注释，您可以在其中添加更多操作（例如创建通知，将注册ID发送到第三方服务器等）。 在Lars Vogel的教程中也可以找到如何执行上述操作的示例。

Answer 2

在我的情况下，我使用单接收器：

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

}

在清单中

 <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

我将解释我所理解的内容。

1. 首先，在android c2dm网站注册，你的Android应用程序包名称在你拥有的gmail id下说com.example.app。

2. 开发一个Android应用程序应该能够将设备注册ID作为请求发送到服务器。 服务器应该将这些ID存储在db中。

3. 一旦准备好从服务器向所有设备发送一些消息，您只需要为在c2dm中注册的gmail id和已存储在db中的设备ID提供新的auth_token。

Vogella教程提供了用于获取设备和auth_token的regid的示例代码。 我已经尝试过并将其用于我的应用程序的修改。