How to Prevent App B from Being Retained in Background When Switching Back to App A in Android? - Stack Overflow

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I have two Android apps, App A and App B, and I am using Intents to switch between them.

Scenario: App A opens App B using an Intent. App B completes its task, and now I need the user to switch back to App A. After completing the task in App B, I want to return to App A, but App B should not remain in the background.

Problem: When switching back from App B to App A, the user can press the back button and navigate back through the previous activities in App B, which I don't want. App B consists of 4 activities: The Main Activity (launched when App B is first opened). 3 other activities that are opened from App A. Every time App A switches to App B, I want App B to behave as if it’s a new session, with no previous activity stack preserved in the background.

Objective: I need to ensure that when switching from App B back to App A, App B is not retained in the background with its previous activities in the stack. Essentially, I want to clear the activity stack of App B when switching back to App A, so that pressing the back button won't show previous screens of App B

What I've Tried: I have used Intents to open App B from App A and vice versa, but I can't seem to clear the activity stack of App B correctly. Any help or guidance on how to achieve this would be greatly appreciated!

I have two Android apps, App A and App B, and I am using Intents to switch between them.

Scenario: App A opens App B using an Intent. App B completes its task, and now I need the user to switch back to App A. After completing the task in App B, I want to return to App A, but App B should not remain in the background.

Problem: When switching back from App B to App A, the user can press the back button and navigate back through the previous activities in App B, which I don't want. App B consists of 4 activities: The Main Activity (launched when App B is first opened). 3 other activities that are opened from App A. Every time App A switches to App B, I want App B to behave as if it’s a new session, with no previous activity stack preserved in the background.

Objective: I need to ensure that when switching from App B back to App A, App B is not retained in the background with its previous activities in the stack. Essentially, I want to clear the activity stack of App B when switching back to App A, so that pressing the back button won't show previous screens of App B

What I've Tried: I have used Intents to open App B from App A and vice versa, but I can't seem to clear the activity stack of App B correctly. Any help or guidance on how to achieve this would be greatly appreciated!

• android
• android-intent
• android-activity
• android-background
• android-task

Share Improve this question Follow asked 2 days ago Santosh NarujeSantosh Naruje 1

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1 Answer 1

Sorted by: Reset to default 0

When launching App B from App A, use the following flags in the Intent to clear the stack:

val intent = Intent(this, AppBMainActivity::class.java)
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK)
startActivity(intent)

• FLAG_ACTIVITY_NEW_TASK: This flag ensures that App B starts in a new task.
• FLAG_ACTIVITY_CLEAR_TASK: This flag clears any existing activities in App B's task, so the activity stack is empty when App B is launched.

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• When you use these flags, any activities that were previously in App B's stack are removed, and App B starts as if it’s a fresh session.
• This ensures that when the user switches from App B back to App A and presses the back button, App B's previous activities do not appear in the back stack.

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