[问题解决]同时显示多个Notification时PendingIntent的Intent被覆盖？

情况是这样的，使用NotificationManager触发多个Notification:

private Notification genreNotification(Context context, int icon, String tickerText, String title, String content, Intent intent){
        Notification notification = new Notification(icon, tickerText, System.currentTimeMillis());
        PendingIntent pendIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        notification.setLatestEventInfo(context, title, content, pendIntent);
        notification.flags |= Notification.FLAG_AUTO_CANCEL;
        return notification;
    }

...
mNotificationManager.notify(ID_1,
                    genreNotification(mContext, ICON_RES,
                            notifyText1, notifyTitle1, notifyText1, intent_1));
...
mNotificationManager.notify(ID_2,
                    genreNotification(mContext, ICON_RES,
                            notifyText2, notifyTitle2, notifyText2, intent_2));

...
mNotificationManager.notify(ID_3,
                    genreNotification(mContext, ICON_RES,
                            notifyText3, notifyTitle3, notifyText3, intent_3));

private Notification genreNotification(Context context, int icon, String tickerText, String title, String content, Intent intent){
        Notification notification = new Notification(icon, tickerText, System.currentTimeMillis());
        PendingIntent pendIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        notification.setLatestEventInfo(context, title, content, pendIntent);
        notification.flags |= Notification.FLAG_AUTO_CANCEL;
        return notification;
    }

...
mNotificationManager.notify(ID_1, 
                    genreNotification(mContext, ICON_RES, 
                            notifyText1, notifyTitle1, notifyText1, intent_1));
...
mNotificationManager.notify(ID_2, 
                    genreNotification(mContext, ICON_RES, 
                            notifyText2, notifyTitle2, notifyText2, intent_2));

...
mNotificationManager.notify(ID_3, 
                    genreNotification(mContext, ICON_RES, 
                            notifyText3, notifyTitle3, notifyText3, intent_3));

 可见ID和Intent都是不同的，生成的PendingIntent分别对应着不同的Intent。但是，你会发觉无论点哪个Notification，传递回来的都是最后被notify的Intent。这里即intent_3。

找了很久，试了改变PendingIntent的flag也无果，最后还是在这帖子里找到答案(CSDN帖子 )，我来总结下：

问题主要出在PendingIntent.getActivity();的第二个参数，API文档里虽然说是未被使用的参数(给出的例子也直接写0的)，实际上是通过该参数来区别不同的Intent的，如果id相同，就会覆盖掉之前的Intent了。所以总是获取到最后一个Intent。

只要每个不同的Intent对应传递一个独立的ID就可以了，以上函数修改如下（增加ID参数）：

private Notification genreNotification(Context context, int icon, String tickerText, String title, String content, Intent intent, int id){
        Notification notification = new Notification(icon, tickerText, System.currentTimeMillis());
        // 问题就在这里的id了
        PendingIntent pendIntent = PendingIntent.getActivity(context, id, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        notification.setLatestEventInfo(context, title, content, pendIntent);
        notification.flags |= Notification.FLAG_AUTO_CANCEL;
        return notification;
    }

...
mNotificationManager.notify(ID_1,
                    genreNotification(mContext, ICON_RES,
                            notifyText1, notifyTitle1, notifyText1, intent_1, ID_1));
...
mNotificationManager.notify(ID_2,
                    genreNotification(mContext, ICON_RES,
                            notifyText2, notifyTitle2, notifyText2, intent_2, ID_2));

...
mNotificationManager.notify(ID_3,
                    genreNotification(mContext, ICON_RES,
                            notifyText3, notifyTitle3, notifyText3, intent_3, ID_3));