Android顯示不週期性通知的Notification

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在Android開發中經常會用到Notification來展示通知，但是之前寫出來的代碼中一個APP只能有一個通知，有新的通知的時候自己會覆蓋之前的通知，一直不知道為什麼，好，話不多說，先貼我之前的代碼

    private void showNotification(String title, Context context) {        NotificationManager notificationManager = (NotificationManager) context                .getSystemService(android.content.Context.NOTIFICATION_SERVICE);        Notification notification = new Notification(R.drawable.ic_launcher,                "XXX", System.currentTimeMillis());        notification.flags = Notification.FLAG_AUTO_CANCEL;        notification.defaults |= Notification.DEFAULT_VIBRATE;        notification.defaults |= Notification.DEFAULT_SOUND;        notification.defaults |= Notification.DEFAULT_LIGHTS;        notification.vibrate = new long[]{0, 100, 200, 300};        Intent intent = null;        if (pushType == 1) {            intent = new Intent(context, Advertisement.class);        } else if (pushType == 2) {            intent = new Intent(context, HomePage.class);        } else if (pushType == 3) {            intent = new Intent(context, OrderList.class);        }        PendingIntent contentIntent = PendingIntent.getActivity(context, 0,                intent, 0);        notification.setLatestEventInfo(context, "XXX", title, contentIntent);        notificationManager.notify(111, notification);    }

　　這幾天，看了Android關於Notification的源碼，發現了notify函數的一段說明

 

/**     * Post a notification to be shown in the status bar. If a notification with     * the same id has already been posted by your application and has not yet been canceled, it     * will be replaced by the updated information.     *     * @param id An identifier for this notification unique within your     *        application.     * @param notification A {@link Notification} object describing what to show the user. Must not     *        be null.     */    public void notify(int id, Notification notification)    {        notify(null, id, notification);    }

　　

在這裡可以看到，Notification中的第一個參數id就是每一個通知的id，按照常理來推斷，只要id一樣，自然就會覆蓋，既然這樣，那就用時間戳記來代替上面的寫法好啦，新代碼如下：

 

  private void showNotification(String title, Context context) {        int requestCode = (int) System.currentTimeMillis();        NotificationManager notificationManager = (NotificationManager) context                .getSystemService(android.content.Context.NOTIFICATION_SERVICE);        Notification notification = new Notification(R.drawable.ic_launcher,                "90上門洗車", System.currentTimeMillis());        notification.flags = Notification.FLAG_AUTO_CANCEL;        notification.defaults |= Notification.DEFAULT_VIBRATE;        notification.defaults |= Notification.DEFAULT_SOUND;        notification.defaults |= Notification.DEFAULT_LIGHTS;        notification.vibrate = new long[]{0, 100, 200, 300};        Intent intent = null;        if (pushType == 1) {            intent = new Intent(context, Advertisement.class);        } else if (pushType == 2) {            intent = new Intent(context, HomePage.class);        } else if (pushType == 3) {            intent = new Intent(context, OrderList.class);        }        PendingIntent contentIntent = PendingIntent.getActivity(context, 0,                intent, 0);        notification.setLatestEventInfo(context, "90上門洗車", title, contentIntent);        notificationManager.notify(requestCode, notification);    }

　　

在這裡，我把notify（）裡面的id參數變成了時間戳記，編譯，運行，好像成功了呢，這樣，就可以顯示不同的通知啦~

 

 =  =  雖然成功了，但是在源碼裡面可以看到，還有一種重載

 

 

 /**     * Post a notification to be shown in the status bar. If a notification with     * the same tag and id has already been posted by your application and has not yet been     * canceled, it will be replaced by the updated information.     *     * @param tag A string identifier for this notification.  May be {@code null}.     * @param id An identifier for this notification.  The pair (tag, id) must be unique     *        within your application.     * @param notification A {@link Notification} object describing what to     *        show the user. Must not be null.     */    public void notify(String tag, int id, Notification notification)    {        int[] idOut = new int[1];        INotificationManager service = getService();        String pkg = mContext.getPackageName();        if (notification.sound != null) {            notification.sound = notification.sound.getCanonicalUri();            if (StrictMode.vmFileUriExposureEnabled()) {                notification.sound.checkFileUriExposed("Notification.sound");            }        }        if (localLOGV) Log.v(TAG, pkg + ": notify(" + id + ", " + notification + ")");        Notification stripped = notification.clone();        Builder.stripForDelivery(stripped);        try {            service.enqueueNotificationWithTag(pkg, mContext.getOpPackageName(), tag, id,                    stripped, idOut, UserHandle.myUserId());            if (id != idOut[0]) {                Log.w(TAG, "notify: id corrupted: sent " + id + ", got back " + idOut[0]);            }        } catch (RemoteException e) {        }    }

　　

這個，才是之前的notifiy（）方法調用的真實的函數，不過就是tag在之前的調用中被設定成了null，在這段代碼的注釋中說道tag和id都是可以拿來區分不同的通知的，我們可以把這兩個混起來使用，實作類別似於qq一樣的效果

 

Android顯示不週期性通知的Notification