Android crashing with enabled bevy_audio

[Gordon-F]

Bevy version

bevy#bc499591c2d090e17c95d2c59bc6e16ba60a023d

Operating system & version

Android 8

What you did

Enable bevy_audio on android.

2022-01-12 18:05:15.946 14333-14393/rust.android D/event crates\bevy_app\src\plugin_group.rs:117:  added plugin: bevy_audio::AudioPlugin
2022-01-12 18:05:15.946 14333-14392/rust.android I/RustStdoutStderr: thread '<unnamed>' panicked at 'called `Option::unwrap()` on a `None` value', C:\Users\user\.cargo\registry\src\git.luolix.top-1ecc6299db9ec823\ndk-glue-0.6.0\src\lib.rs:59:39

[manokara]

The panic comes from here:

https://github.com/rust-windowing/android-ndk-rs/blob/f4dc7265aaa3e51f355ff1cb298e18167685fc7f/ndk-glue/src/lib.rs#L58-L60

For some reason it can't get the activity for the app, it must be something on rodio or cpal causing it.

[manokara]

Ah, I think I see whats going on here. The activity handle is actually initialized in ndk_glue::init, which is usually called by using the ndk_glue::main macro. You need to add this above your main() function:

#[cfg_attr(target_os = "android", ndk_glue::main(backtrace = "full"))]

I wonder if there's a way to do that it bevy automatically?

[Gordon-F]

I wonder if there's a way to do that it bevy automatically?

It's a part of bevy_main -

bevy/crates/bevy_derive/src/bevy_main.rs

Line 19 in a6d3cd9

bevy::ndk_glue::init(

[manokara]

Oh, right. Are you using it though? From reading the code in ndk_glue it should set the activity handle to Some, even if it's invalid somehow, because the panic would be somewhere else.

[Gordon-F]

Oh, right. Are you using it though?

Yep, this is init problem with bevy_audio and potentially with bevy_assets (it get a native_activity in Plugin build step too). But this should be a part of startup system, that running after native activity is available.

So, if you have a powerful device, maybe you didn't see this errors at all.

[b333z]

Think this might be rust-mobile/ndk#211

[mockersf]

winit is bringing in ndk 0.5, and rodio is using both ndk 0.3 and 0.6... so it's probably not possible to get audio working with bevy_audio...