問(wèn)題描述

我正在構(gòu)建一個(gè)將接收推送通知的 Android 應(yīng)用.我已經(jīng)設(shè)置了 Firebase Cloud Messaging 并且?guī)缀蹩梢哉９ぷ鳎@樣我就可以將以下有效負(fù)載發(fā)送到有效令牌并接收通知和數(shù)據(jù).

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.

使用網(wǎng)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"}
}

我的應(yīng)用程序正確接收并可以處理它.

My app receives it correctly and can deal with it.

唯一的小問(wèn)題是我在調(diào)試中拋出了以下異常:

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)
        ...

它不會(huì)使應(yīng)用程序崩潰，只是看起來(lái)不整潔.

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

我嘗試將 timestamp 項(xiàng)添加到主要有效負(fù)載、通知、數(shù)據(jù)中，還嘗試了諸如 time 之類的變體，但似乎無(wú)法獲得擺脫異常(和谷歌一樣，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).

如何傳遞時(shí)間戳以使其停止抱怨?

How do I pass the timestamp so it stops complaining?

已這是我的 onMessageReceived 方法，但我認(rèn)為異常在到達(dá)此處之前已引發(fā)

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());
    }
}

提前致謝，克里斯

推薦答案

盡管 notification 顯然是受支持的元素(根據(jù) Firebase 網(wǎng)絡(luò)文檔)，但我可以擺脫例外是完全刪除它，只使用 data 部分，然后在我的應(yīng)用程序中創(chuàng)建一個(gè)通知(而不是讓 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).

我使用這個(gè)網(wǎng)站來(lái)研究如何發(fā)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/

我的通知現(xiàn)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 看起來(lái)像這樣:

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());
        }
    }
}

調(diào)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());
    }
}

然后調(diào)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);
}

隨后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);
}

更多細(xì)節(jié)在上面的鏈接中，處理很多，但至少異常消失了，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.

這篇關(guān)于Android/Firebase - 在 GCM 事件中解析時(shí)間戳?xí)r出錯(cuò) - 時(shí)間戳為空的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，也希望大家多多支持html5模板網(wǎng)！