Android/Firebase - 在 GCM 事件中解析时间戳时出错

问题描述

我正在构建一个将接收推送通知的 Android 应用.我已经设置了 Firebase Cloud Messaging 并且几乎可以正常工作，这样我就可以将以下有效负载发送到有效令牌并接收通知和数据.

I'm building an Android app which will receive push notifications. I've got Firebase Cloud Messaging setup and pretty much working, such that I can send the following payload to a valid token and the notification and data are received.

使用网址https://fcm.googleapis.com/fcm/send

{
 "to":"<valid-token>",
 "notification":{"body":"BODY TEXT","title":"TITLE TEXT","sound":"default"},
 "data":{"message":"This is some data"}
}

我的应用程序正确接收并可以处理它.

My app receives it correctly and can deal with it.

唯一的小问题是我在调试中抛出了以下异常:

The only slight wrinkle is that I get the following exception thrown in the debug:

Error while parsing timestamp in GCM event
    java.lang.NumberFormatException: Invalid int: "null"
        at java.lang.Integer.invalidInt(Integer.java:138)
        ...

它不会使应用程序崩溃，只是看起来不整洁.

It doesn't crash the app, it just looks untidy.

我尝试将 timestamp 项添加到主要有效负载、通知、数据中，还尝试了诸如 time 之类的变体，但似乎无法获得摆脱异常(和谷歌一样，我找不到答案).

I've tried adding a timestamp item to the main payload, the notification, the data, and also tried variations such as time but can't seem to get rid of the exception (and google as I might, I can't find an answer).

如何传递时间戳以使其停止抱怨?

How do I pass the timestamp so it stops complaining?

已这是我的 onMessageReceived 方法，但我认为异常在到达此处之前已引发

Edited: Here is my onMessageReceived method, but I think the exception is thrown before it gets here

@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    Log.d(TAG, "From: " + remoteMessage.getFrom());

    // Check if message contains a data payload.
    if (remoteMessage.getData().size() > 0) {
        Log.d(TAG, "Message data payload: " + remoteMessage.getData());
        //TODO Handle the data
    }

    // Check if message contains a notification payload.
    if (remoteMessage.getNotification() != null) {
        Log.d(TAG, "Message Notification Body: " + remoteMessage.getNotification().getBody());
    }
}

提前致谢，克里斯

推荐答案

尽管 notification 显然是受支持的元素(根据 Firebase 网络文档)，但我可以摆脱例外是完全删除它，只使用 data 部分，然后在我的应用程序中创建一个通知(而不是让 firebase 做通知).

Even though notification is apparently a supported element (according to the Firebase web docs), the only way I could get rid of the exception was to remove it entirely, and use the data section only, and then in my app create a notification (rather than letting firebase do the notification).

我使用这个网站来研究如何发出通知:https://www.androidhive.info/2012/10/android-push-notifications-using-google-cloud-messaging-gcm-php-and-mysql/

I used this site to work out how to raise the notifications: https://www.androidhive.info/2012/10/android-push-notifications-using-google-cloud-messaging-gcm-php-and-mysql/

我的通知现在如下所示:

My notification now looks like the following:

    $fields = array("to" => "<valid-token>",
                    "data" => array("data"=>
                                        array(
                                            "message"=>"This is some data",
                                            "title"=>"This is the title",
                                            "is_background"=>false,
                                            "payload"=>array("my-data-item"=>"my-data-value"),
                                            "timestamp"=>date('Y-m-d G:i:s')
                                            )
                                    )
                    );
    ...
    <curl stuff here>
    ...
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($fields));

我的 onMessageReceived 看起来像这样:

My onMessageReceived looks like this:

@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    Log.d(TAG, "From: " + remoteMessage.getFrom());

    // Check if message contains a data payload.
    if (remoteMessage.getData().size() > 0) {
        Log.e(TAG, "Data Payload: " + remoteMessage.getData().toString());

        try {
            JSONObject json = new JSONObject(remoteMessage.getData().toString());
            handleDataMessage(json);
        } catch (Exception e) {
            Log.e(TAG, "Exception: " + e.getMessage());
        }
    }
}

调用 handleDataMessage 如下所示:

private void handleDataMessage(JSONObject json) {
    Log.e(TAG, "push json: " + json.toString());

    try {
        JSONObject data = json.getJSONObject("data");

        String title = data.getString("title");
        String message = data.getString("message");
        boolean isBackground = data.getBoolean("is_background");
        String timestamp = data.getString("timestamp");
        JSONObject payload = data.getJSONObject("payload");

        // play notification sound
        NotificationUtils notificationUtils = new NotificationUtils(getApplicationContext());
        notificationUtils.playNotificationSound();

        if (!NotificationUtils.isBackgroundRunning(getApplicationContext())) {
            // app is in foreground, broadcast the push message
            Intent pushNotification = new Intent(ntcAppManager.PUSH_NOTIFICATION);
            pushNotification.putExtra("message", message);
            LocalBroadcastManager.getInstance(this).sendBroadcast(pushNotification);

        } else {
            // app is in background, show the notification in notification tray
            Intent resultIntent = new Intent(getApplicationContext(), MainActivity.class);
            resultIntent.putExtra("message", message);

            showNotificationMessage(getApplicationContext(), title, message, timestamp, resultIntent);
        }
    } catch (JSONException e) {
        Log.e(TAG, "Json Exception: " + e.getMessage());
    } catch (Exception e) {
        Log.e(TAG, "Exception: " + e.getMessage());
    }
}

然后调用 showNotificationMessage

/**
 * Showing notification with text only
 */
private void showNotificationMessage(Context context, String title, String message, String timeStamp, Intent intent) {
    notificationUtils = new NotificationUtils(context);
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
    notificationUtils.showNotificationMessage(title, message, timeStamp, intent);
}

随后notificationUtils.showNotificationMessage

public void showNotificationMessage(String title, String message, String timeStamp, Intent intent) {
    showNotificationMessage(title, message, timeStamp, intent, null);
}

public void showNotificationMessage(final String title, final String message, final String timeStamp, Intent intent, String imageUrl) {
    // Check for empty push message
    if (TextUtils.isEmpty(message))
        return;


    // notification icon
    final int icon = R.mipmap.ic_launcher;

    intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
    final PendingIntent resultPendingIntent =
            PendingIntent.getActivity(
                    mContext,
                    0,
                    intent,
                    PendingIntent.FLAG_CANCEL_CURRENT
            );

    final NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(
            mContext);

    final Uri alarmSound = Uri.parse(ContentResolver.SCHEME_ANDROID_RESOURCE
            + "://" + mContext.getPackageName() + "/raw/notification");


    showSmallNotification(mBuilder, icon, title, message, timeStamp, resultPendingIntent, alarmSound);
    playNotificationSound();

}

private void showSmallNotification(NotificationCompat.Builder mBuilder, int icon, String title, String message, String timeStamp, PendingIntent resultPendingIntent, Uri alarmSound) {

    NotificationCompat.InboxStyle inboxStyle = new NotificationCompat.InboxStyle();

    inboxStyle.addLine(message);

    Notification notification;
    notification = mBuilder.setSmallIcon(icon).setTicker(title).setWhen(0)
            .setAutoCancel(true)
            .setContentTitle(title)
            .setContentIntent(resultPendingIntent)
            .setSound(alarmSound)
            .setStyle(inboxStyle)
            .setWhen(getTimeMilliSec(timeStamp))
            .setSmallIcon(R.mipmap.ic_launcher)
            .setLargeIcon(BitmapFactory.decodeResource(mContext.getResources(), icon))
            .setContentText(message)
            .build();

    NotificationManager notificationManager = (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE);
    notificationManager.notify(ntcAppManager.NOTIFICATION_ID, notification);
}

更多细节在上面的链接中，处理很多，但至少异常消失了，我可以控制通知.

More detail in the link above, and it's a lot of handling but at least the exception's gone and I'm in control of the notifications.

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