Remove android game activity from default

[oelison]

android handle only one activity, either game or native. To use native, the default could now be used, but all other android need to add the game activity.

Objective

android native activities should be able to use the default

Solution

remove android-game-activity from default

Testing

created a default app for android native activity with default

Important

Will be a breaking change for apps using android-game-activity.

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[leomeinel]

I'm not sure if I might be misunderstanding your description, but as far as I know, the android-native-activity feature is still required if using NativeActivtiy. If we just remove android-game-activity from the defaults, one would always have to add one of the activity features to be able to build for android at all.

Is that what this PR wants to achieve to make it simpler to use android-native-activity?

[oelison]

Yes. If one of them is set, the default is not usable anymore, because both can not be set.
My minimum Cargo.toml is

[package]
name = "my_bevy_start"
version = "0.1.0"
edition = "2024"
license = "MIT OR Apache-2.0"
repository = "https://github.com/oelison/my_bevy_start"
publish = false

# common (desktop / linux) features
[dependencies]
bevy_ecs = "0.18.0"
bevy_gizmos = "0.18.0"
bevy_mod_openxr = { version = "0.5.0", features = [
    "window_support",
    "fb_passthrough",
] }
bevy_mod_xr = "0.5.0"
bevy_xr_utils = "0.5.0"
openxr = "0.21.1"
schminput = { version = "0.5.0", features = ["xr"] }

[target.'cfg(not(target_os = "android"))'.dependencies]
audio = "0.2.1"
bevy = {version = "0.18.0" }

[target.'cfg(target_os = "android")'.dependencies]
# Android-only features (won't be compiled on Linux)
bevy = { version = "0.18", default-features = false, features = [
    "android-native-activity",
    "android_shared_stdcxx",
    "default_app",
    "std",
    "default_font",
    "multi_threaded",
    "sysinfo_plugin",
    "2d_bevy_render",
    "scene",
    "audio",
    "picking",
    "3d_bevy_render",
    "ui_api",
    "ui_bevy_render",
] }

[build-dependencies]
reqwest = { version = "0.12", features = ["blocking"] }
zip = "2.1"

[lib]
name="my_bevy_start"
crate-type = ["rlib", "cdylib"]

#[[bin]]
#path="src/lib.rs"
#name="my_bevy_start"

There is a lot differences between android XR app and a Linux/Windows app. There fore it should be better to remove the android-game-activity and manually add one of the android-native-activity or the android-game-activity.