Activity has a method called getTaskId(). How do I know if this task id matches the task id of the Application task stack?

android-activity android android-applicationinfo
user2676468 picture user2676468 · Jul 18, 2014 · Viewed 7.1k times · Source

I can get the app ID from my running activity via activity.getTaskId(). It will report back 185. If I go to another app, and start my activity from a share button, it will be placed IN THAT apps stack. If I do activity.getTaskId() it will report back 192 for example. I am assuming that an application process can only have one main task stack associated with it. How do I get that tasks ID? I want to be able to know "Hey I'm running outside of your apps task stack".

I contemplated doing this by polling the taskId the first time my activity is created and set that as a member variable to my Application Class, but if my app is killed, and then started first from another application, it will have the incorrect task id as the "AppTaskStackId". I haven't found any API for this.

Answer

JesusFreke picture JesusFreke · Jul 18, 2014

A different approach might be to have both an exported and non-exported activity. The exported activity would simply be forwarded on to the non-exported activity, but with an extra denoting that it was started externally. And then when starting the activity internally, you always call the non-exported activity without that "isExternal" extra.

And then, in the non-exported activity, you can check for the existence of that extra to determine if the activity was started internally or externally.

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