Android Activity Stack

How to see if the next time I press the back (hardware) button, will take me on the screen. My question is 开发者_如何学JAVAbasically: Is there a way to see the size of the Activity Stack (API level 7).

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boolean Activity.isTaskRoot(); Since: API Level 1

Return whether this activity is the root of a task. The root is the first activity in a task.

Just don't do it in onCreate() as the calling activity may not have finish()ed itself yet.