在GoogleCloudMessaging API中，如何处理注册ID的续订或到期？

我正在给出一种方法，就像我在应用程序中实现的一样

@Overrideprotected void onRegistered(Context context, String registrationId) {     Log.i(TAG, "Device registered: regId = " + registrationId);     //displayMessage(context, getString(R.string.gcm_registered));     //ServerUtilities.register(context, registrationId);     //1. Store this id to application Prefs on each request of device registration     //2. Clear this id from app prefs on each request of device un-registration       //3. Now add an if check for new registartion id to server, you can write a method on server side to check if this reg-id matching for this device or not (and you need an unique identification of device to be stored on server)     //4. That method will clear that if id is matching it meanse this is existing reg-id, and if not matching this is updated reg-id.     //5. If this is updated reg-id, update on server and update into application prefs.}

你也可以这样

if reg_id exists_into prefrences then    if stored_id equals_to new_reg_id then        do nothing    else        say server to reg_id updated        update prefrences with new id    end ifelse    update this id to application prefs    say server that your device is registeredend if

但是，当用户清除应用程序数据并且您将丢失当前的注册表ID时，就会出现问题。

新API示例示例的更新
功劳归功于Eran及其Android上的Google
Cloud Messaging中的)他的答案处理注册ID更改

Google更改了其演示应用程序以使用新界面。他们通过在应用程序本地保留的值上设置过期日期来刷新注册ID。应用启动时，他们会加载其本地存储的注册ID。如果它已“过期”（在演示中这意味着它是7天前从GCM收到的），他们会

gcm.register(senderID)

这不适用于假设的情况，在这种情况下，Google会为长时间未启动的应用刷新注册ID。在这种情况下，应用程序将不会知道更改，第三方服务器也不会。

public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);    mDisplay = (TextView) findViewById(R.id.display);    context = getApplicationContext();    regid = getRegistrationId(context);    if (regid.length() == 0) {        registerBackground();    }    gcm = GoogleCloudMessaging.getInstance(this);}private String getRegistrationId(Context context) {    final SharedPreferences prefs = getGCMPreferences(context);    String registrationId = prefs.getString(PROPERTY_REG_ID, "");    if (registrationId.length() == 0) {        Log.v(TAG, "Registration not found.");        return "";    }    // check if app was updated; if so, it must clear registration id to    // avoid a race condition if GCM sends a message    int registeredVersion = prefs.getInt(PROPERTY_APP_VERSION, Integer.MIN_VALUE);    int currentVersion = getAppVersion(context);    if (registeredVersion != currentVersion || isRegistrationExpired()) {        Log.v(TAG, "App version changed or registration expired.");        return "";    }    return registrationId;}private boolean isRegistrationExpired() {    final SharedPreferences prefs = getGCMPreferences(context);    // checks if the information is not stale    long expirationTime = prefs.getLong(PROPERTY_ON_SERVER_EXPIRATION_TIME, -1);    return System.currentTimeMillis() > expirationTime;}