问题 GCM如何使用GCM和第三方服务器取消注册设备

我有一个使用GCM推送通知的应用。它工作正常，我的设备注册并接收推送消息。

如果我从我的设备上卸载应用程序，我将不再收到您所期望的消息。在我卸载应用程序后，您在服务器上发送消息的TextBox仍然存在，我也期望。

我查看了有关取消注册的文档，您可以手动或自动完成。

The end user uninstalls the application.
The 3rd-party server sends a message to GCM server.
The GCM server sends the message to the device.
The GCM client receives the message and queries Package Manager about whether there are broadcast receivers configured to receive it, which returns false.
The GCM client informs the GCM server that the application was uninstalled.
The GCM server marks the registration ID for deletion.
The 3rd-party server sends a message to GCM.
The GCM returns a NotRegistered error message to the 3rd-party server.
The 3rd-party deletes the registration ID.

我不明白上面列表中的下一个语句。

The GCM returns a NotRegistered error message to the 3rd-party server.

这是怎么回事？

此外，如果从设备中卸载应用程序，它如何进行以下声明？是否有一个应用程序生命周期方法，当应用程序从设备中删除时执行？如果有，这是放置代码的地方，通知GCM服务器卸载并调用第三方服务器上的php脚本从数据库中删除regID吗？

The GCM client informs the GCM server that the application was uninstalled.

提前致谢，

马特

[edit1]

static void unregister(final Context context, final String regId) {
        Log.i(TAG, "unregistering device (regId = " + regId + ")");
        String serverUrl = SERVER_URL + "/unregister.php";
        Map<String, String> params = new HashMap<String, String>();
        params.put("regId", regId);
        try {
            post(serverUrl, params);
            GCMRegistrar.setRegisteredOnServer(context, false);
            String message = context.getString(R.string.server_unregistered);
            CommonUtilities.displayMessage(context, message);
        } catch (IOException e) {
            // At this point the device is unregistered from GCM, but still
            // registered in the server.
            // We could try to unregister again, but it is not necessary:
            // if the server tries to send a message to the device, it will get
            // a "NotRegistered" error message and should unregister the device.
            String message = context.getString(R.string.server_unregister_error,
                    e.getMessage());
            CommonUtilities.displayMessage(context, message);
        }
    }

[EDIT2] 以下取消注册代码用于在从手机中删除应用程序后取消注册第三方服务器上的设备。该代码是以下教程的补充。

教程

send_messages.php

<?php
if (isset($_GET["regId"]) && isset($_GET["message"])) {
    $regId = $_GET["regId"];
    $message = $_GET["message"];
    $strRegID = strval($regId);

    include_once './GCM.php';
    include_once './db_functions.php';
    $gcm = new GCM();

    $registatoin_ids = array($regId);
    $message = array("price" => $message);

    $result = $gcm->send_notification($registatoin_ids, $message);
    $db = new db_Functions();

    if (strcasecmp ( strval($result) , 'NotRegistered' )) {
    $db->deleteUser($strRegID);
    }
}
?>

db_functions.php

public function deleteUser($regid) {

    $strRegID = strval($regid);

    $serverName = "LOCALHOST\SQLEXPRESS"; 
        $uid = "gcm";     
        $pwd = "gcm";    
        $databaseName = "gcm";   

        $connectionInfo = array( "UID"=>$uid, "PWD"=>$pwd, "Database"=>$databaseName); 


             $db = sqlsrv_connect($serverName,$connectionInfo) or die("Unable to connect to server");

             $query = "DELETE FROM gcmUser2 WHERE gcuRegID = '$regid'";
             $result = sqlsrv_query($db, $query);


    }