该服务创建一个持久通知并通过 PendingIntent 开始对点击的主要活动。这里是code。

The service creates a persistent Notification and starts the main activity on click via PendingIntent. Here is the code.

Intent notificationIntent = new Intent(getApplicationContext(), ViewPagerActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(StreamingService.this, 0, notificationIntent, 0);

但是，如果的主要活动启动当我preSS通知，则将启动再次，然后再和......

However, if the main activity is started when I press notification, it will be started again, and again and...

在最后，我也有同样的活性起球了，一个在另一个上面。我可以用pressing后退按钮，这将杀死的主要活动一次，然后让我回到相同的活动，直到我结束最后一个看到这一点。

In the end, I have the same activity pilled up, one on the top of another. I can see this by pressing the back button, which will kill the Main activity once and then get me back to the same activity until I close the last one.

我怎么能prevent这种情况发生？可 PendingIntent 检测瞄准活动运行，因此它不会再次创建相同的活动，而是开始运行的一个？

How can I prevent this to happen? Can PendingIntent detect that aiming activity is running so it does not create the same activity again, but rather start the running one?

PS。我道歉，如果不能够说明这一点。如果是这样的话，让我知道，我会重组的问题。

PS. I apologize if not being able to explain this well. If this is the case, let me know and I will rephrase the problem.

推荐答案

根据要实现的具体行为，你可以通过这些标志之一，因为getActivity（）的最后一个参数：

Depending on the exact behaviour you want to implement, you could pass one of these flags as the last param of getActivity():