Open library to be added to any apex am: d9f8b25d93 am: 9f55ff38c7 am: eca178ca82 am: d2d893e401

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/android_logger/+/2219482

Change-Id: Ie7823c187a660fca82da681ec03690fe7c053fe9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
tree: 43087064b32c43c203c1d38741202eca17d23276
  1. .github/
  2. patches/
  3. src/
  4. tests/
  5. .cargo_vcs_info.json
  6. .gitignore
  7. Android.bp
  8. Cargo.toml
  9. Cargo.toml.orig
  10. cargo2android.json
  11. LICENSE-APACHE
  12. LICENSE-MIT
  13. METADATA
  14. MODULE_LICENSE_APACHE2
  15. OWNERS
  16. README.md
  17. TEST_MAPPING
README.md

Send Rust logs to Logcat

Version CI status

This library is a drop-in replacement for env_logger. Instead, it outputs messages to android's logcat.

This only works on Android and requires linking to log which is only available under android. With Cargo, it is possible to conditionally require this library:

[target.'cfg(target_os = "android")'.dependencies]
android_logger = "0.11"

Example of initialization on activity creation, with log configuration:

#[macro_use] extern crate log;
extern crate android_logger;

use log::Level;
use android_logger::{Config,FilterBuilder};

fn native_activity_create() {
    android_logger::init_once(
        Config::default()
            .with_min_level(Level::Trace) // limit log level
            .with_tag("mytag") // logs will show under mytag tag
            .with_filter( // configure messages for specific crate
                FilterBuilder::new()
                    .parse("debug,hello::crate=error")
                    .build())
    );

    trace!("this is a verbose {}", "message");
    error!("this is printed by default");
}

To allow all logs, use the default configuration with min level Trace:

#[macro_use] extern crate log;
extern crate android_logger;

use log::Level;
use android_logger::Config;

fn native_activity_create() {
    android_logger::init_once(
        Config::default().with_min_level(Level::Trace));
}

There is a caveat that this library can only be initialized once (hence the init_once function name). However, Android native activity can be re-created every time the screen is rotated, resulting in multiple initialization calls. Therefore this library will only log a warning for subsequent init_once calls.

This library ensures that logged messages do not overflow Android log message limits by efficiently splitting messages into chunks.

License

Licensed under either of

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.