Not all Android versions do now log

[peterdk]

I upgraded from 0.12.0 to 0.13.0, and while logging still works at API 33, I get with indentical apk, no output in API 26 for example.
I don't know why? Could it be not selecting proper output log buffer? I basically do this:

 android_logger::init_once(Config::default().with_max_level(LevelFilter::Trace));

[peterdk]

Thanks for the library by the way!

[tyranron]

@peterdk maybe... did you try to specify log buffer explicitly?

[peterdk]

When I specify

.with_log_buffer(LogId::System)

It immediately starts working again on Android 9. When I dont' specify it, all logs are silent.

I would expect that the LogId is set to System by default?

[tyranron]

@peterdk

I would expect that the LogId is set to System by default?

No, of course not. By default, system defaults are used. I guess that it differs depending on Android version.

Prior 0.13, we've used __android_log_write(), and now we use __android_log_buf_write(). Its documentation says:

Apps should use __android_log_write() instead.

So, I can conclude that __android_log_write() is hardcoded to use LOG_ID_MAIN buffer.

I guess you should be totally OK with .with_log_buffer(LogId::Main).

[peterdk]

Ah ok I understand. Just noting that lots of users probably now get their logs not visible by default. Maybe update documentation for this?

[tyranron]

@peterdk could you bisect starting from which Android API version system defaults don't work? Is this API 26 and down and API 27 is OK?

[tyranron]

Ideally, it would be nice to default to LOG_ID_DEFAULT on APIs supporting it and LOG_ID_MAIN otherwise. However, I cannot figure out how to detect API level programmatically.

@peterdk could you advise something here? Or maybe you can even craft a PR doing that?

[peterdk]

What is your reasoning behind not just setting it to default main? I haven't come across any other logcat log in my day to day Android development? And in case some platform Android Rust code uses this library, they can set it to the preferred stream? As you wrote, normal apps only use Main. I didn't even know there were others.

[tyranron]

rfc @rsglobal

[tyranron]

@peterdk

As you wrote, normal apps only use Main.

If that was the case, the Android developers could have not introduce LOG_ID_DEFAULT at all. But it's there for some reason. Complying with their assumptions rather than introducing our own logic seems reasonable and future-proof.

[tyranron]

@peterdk fixed in #67, released in 0.13.1.