Notification启动broadcast失败

手机启动后，后台broadcast满天飞。可能点击自己应用的Notification 启动的broadcast半天不响应。这时候加上FLAG_RECEIVER_FOREGROUND吧。注意此flag在API 16中引入.

示例:

Intent intent = new Intent(context, XXXReceiver.class);
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN) {
            intent.addFlags(Intent.FLAG_RECEIVER_FOREGROUND);
        }
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
...

注FLAG_RECEIVER_FOREGROUND的doc：

    /**
     * If set, when sending a broadcast the recipient is allowed to run at
     * foreground priority, with a shorter timeout interval.  During normal
     * broadcasts the receivers are not automatically hoisted out of the
     * background priority class.
     */
    public static final int FLAG_RECEIVER_FOREGROUND = 0x10000000;