What I want to happen is when the user opens the attachment and ImportActivity finishes what its doing (it has android:noHistory set to true) and calls startActivity(intent), RootActivity is started, but keeping only one instance and the rest of the activities on top of it in the original task (in this case SecondActivity)are removed.

我想这样做的原因是，如果用户浏览了我的应用程序导入文件后，再触摸它加载的第一个任务，其背部栈的应用图标，然后我在运行中，用户可以在两个两个任务我的应用程序的不同部分一次。

The reason I want this is if the user navigates out of my application after importing the file and then touches the app icon it loads the first task with its back stack and I have two tasks running in which the user can be in two different parts of my application at once.

我已经试过

我打周围的发射模式，但没有一个是给我的，我需要的功能。

I have played around with the launch mode but none of them really give me the functionality that I need.

启动模式我都试过。

安卓launchMode =singleTask的 - 这刚开始有人推出了根系活力又各一次。即使用户pressed home键我的应用程序中，碰到的应用程序图标后面堆被摧毁。

android:launchMode="singleTask" - this just started the root activity again each time it was launched. Even if the user pressed the home button inside my application and touched the App icon the back stack was destroyed.

机器人：launchMode =singleInstance 的=不允许任何其他activites在任务执行

android:launchMode="singleInstance = doesn't allow any other activites to run in the task.

另外调用的意图时，启动 RootActivity 我使用了下列无济于事。

Also when calling the intent to start the RootActivity I have used the following to no avail.

Intent i = new Intent(ImportActivity.this,TrackingActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);

是否有可能做我想做的？

Is it possible to do what I want?

在此先感谢

推荐答案

您说

Gmail >> Message >> Open attachment in my application >> ImportActivity >> RootActivity

但可能是不对的。在这种情况下，Gmail会问题，在您的应用程序针对的是 ImportActivity 的意图。 ImportActivity 将执行。但是，我读https://developer.android.com/guide/components/tasks-and-back-stack.html建议 ImportActivity 将作为同一任务的Gmail的一部分，除非你在清单中，以特步执行，将放在后面堆栈gmail的任务之上， prevent的或Gmail专门调用它作为一个单独的任务。当 ImportActivity 结束，它不应该叫 startActivity（intentForRootActivity），但应该只是叫完成（），这样它会被销毁，从Gmail它位于其下方的背部栈的活动将出现。

but that may not be right. In this circumstance, gmail will issue an Intent targeted at the ImportActivity in your app. ImportActivity will execute. However, my reading of https://developer.android.com/guide/components/tasks-and-back-stack.html suggests that ImportActivity will execute as part of the same task as gmail and will be put on top of the back stack for the gmail task, unless you take special steps in the manifest to prevent that or gmail specifically invokes it as a separate task. When ImportActivity finishes, it shouldn't call startActivity(intentForRootActivity) but should just call finish() so that it will be destroyed and the activity from gmail which lies underneath it in the back stack will appear.

如果 ImportActivity 打过电话 startActivity（intentForRootActivity）然后 RootActivity 只想去到Gmail的任务的顶部，并出现在Gmail中回堆栈。触摸家居，然后使用Gmail的启动器图标将看到 RootActivity 再次出现，隐藏的Gmail下方。

If ImportActivity did call startActivity(intentForRootActivity) then RootActivity would just go onto the top of the gmail task and appear on the gmail back stack. Touching home and then the launcher icon for gmail would see RootActivity reappear, hiding gmail underneath.

我想你需要机器人：launchMode =标准在 ImportActivity 的舱单申报

I think you need android:launchMode="standard" in the manifest declaration of ImportActivity.

这将重新$ P $任务psents您的应用程序的旧的，独立实例不会被修改。如果有人触动了您的应用程序启动器图标，您的应用程序的老态会恢复，不会影响在Gmail的任务，不管发生什么事情。

The task which represents the older, stand-alone instance of your app will not be modified. If someone touches the launcher icon for your app, the old state of your app will be restored, unaffected by whatever happened in the gmail task.