IssueTracker

It would also be nice to be able to set different maxLines for the large and small titles. For example, setting maxLines = 2 for the large title and maxLines = 1 for the small title.

This functionality is something that would also be possible with TwoRowsTopAppBar being publicly exposed.

@Nick - Having the app bar adjust to its content height is quite tricky here, mainly when there are other constraints that involve the scroll behavior.

What we did at https://android-review.googlesource.com/3000717 should help you with setting a different height for any one of the top app bars. The maxLines will still be applied to the Text, however, the height set up is going to be done programmatically on the top app bar you chose.

@sgibly We don't really need the app bar to adjust to its content height. What we are asking for is a way to configure the title based on expanded/collapsed state. TwoRowsTopAppBar provides a way to handle this, but is a private composable.

Our goal:

• use a slightly larger font size than the current default when in the expanded state
• allow the title to wrap 2 lines when in the expanded state
• confine the tile to a single line when in the collapsed state

As a workaround we have forked https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:compose/material3/material3/src/commonMain/kotlin/androidx/compose/material3/AppBar.kt and added a convenience ExtraLargeTopAppBar composable that we use throughout our application: https://paste.googleplex.com/4926344363769856#l=100

Similar to this request, I would like to request just that the smallTitle field of TwoRowsTopAppBar is exposed in LargeTopAppBar, defaulting to the title composable. We currently are awkwardly manually handling the transition of large to small and back based on the collapsed fraction of the scroll state, but it seems like the title/smalltitle solution is already there and probably superior.

The problem that comes up with both rows of the TwoRowsTopAppBar being set to a large title is that on large font sizes/display sizes there is far too much white space for the invisible first app bar.

Added TwoRowsTopAppBar API here.

This should allow more flexibility when creating top app bars with two rows. We also previous made changes to support larger fonts in the app bars, so those changes should cover the rest of the request here (I hope :)).

Please let us know if you hit any issues.

The following release(s) address this bug.It is possible this bug has only been partially addressed:

• androidx.compose.material3:material3:1.4.0-alpha07
• androidx.compose.material3:material3-android:1.4.0-alpha07
• androidx.compose.material3:material3-jvmstubs:1.4.0-alpha07
• androidx.compose.material3:material3-linuxx64stubs:1.4.0-alpha07

Project: platform/frameworks/support
Branch: androidx-main
Author: Shalom Gibly <sgibly@google.com>
Link:      https://android-review.googlesource.com/3478344

Update the TwoRowsTopAppBar API

Update the TwoRowsTopAppBar API 
 
- Update the API to the feedback from the API council. 
- Remove the `expanded` lambda parameter and have a separate params for 
  the expanded and collapsed heights. 
 
Test: Updated 
Bug: 306697446 
Bug: 229134133 
Bug: 268068946 
Fixes: 394144086 
Relnote: "Updates to the TowRowsTopAppBar API. We removed the `expanded` 
lambda parameters and added separate parameters for the expanded and 
collapsed heights." 
 
Change-Id: Idd6777bc381871b9e77c040762c6bca7355cda8a

The reproduction in #comment3 compiles after f3628f7a1f18b25b04d25342da87985e3e573ee0 (#comment10).

We need to check the presence of this issue on our release branches so keeping this open until resolved on branches.

Thanks for confirming and again for taking the time to report the issue! The fix has now been included on release branches back to 3.1