:question: Where can i find that sample? :thinking...

# compose

[theapache64]

❓ Where can i find that sample? 🤔 I’ve looked at cs.android.com

* @sample androidx.activity.compose.samples.BackHandler

[Albert Chang]

https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:activity/activity-compose/samples/src/main/java/androidx/activity/compose/samples/BackHandlerSample.kt;l=32

[theapache64]

@Albert Chang Yeah, i’ve seen that one. but the sample is not using the BackHandler method.

[Ian Lake]

Yes it is: line 34

[theapache64]

Ohh okay. my bad 🤦‍♂️

[theapache64]

but i was looking for an advanced example. especially the usage of enabled flag. for eg, how do i turn off the BackHandler and pass the backpress event to system.

[theapache64]

another eg would, when the navController doesn’t have anything to pop and i need to close the activity. can i simply hoist a callback and call finish() on activity ?

[Rudolf Tammekivi]

Use it conditionally, like mentioned here: https://kotlinlang.slack.com/archives/CJLTWPH7S/p1628047134467500?thread_ts=1628046266.460700&cid=CJLTWPH7S

[Ian Lake]

If the NavController has no destination to pop, it will automatically set its own back handler to disabled, you don't have to do anything to get the default behavior to finish your activity when there's nothing to pop

[theapache64]

Okay. now i got it. the problem was I didn’t disable the BackHandler. so it was intercepting the back press call.
@Ian Lake what’s the recommended way to close the activity if there’s only one entry remaining? (current problem is, once all destinations are popped, the app shows a blank screen, then only it closes the activity)

[Ian Lake]

That's not how NavController works - it only enables it's back handler if there are more than one destination on the back stack. If there's only one left, it will be disabled and the activity will be finished. Note that there was a bug fix for this when using dialog destination that was fixed in alpha06

[Ian Lake]

File a bug if you're still seeing it in alpha06