Bug: 159321223

Clone this repo:
  1. 8d51134 Merge "Upgrade rust/crates/android_logger to 0.9.2" by Thiébaud Weksteen · 6 weeks ago master
  2. 72e177f Upgrade rust/crates/android_logger to 0.9.2 by Haibo Huang · 6 weeks ago
  3. a89a4a5 Mark ab/6881855 as merged by Xin Li · 8 weeks ago
  4. 8e8f670 Skip ab/6749736 in stage. by Xin Li · 3 months ago
  5. bc83748 Regenerate Android.bp for new version am: 9e8b8be23c am: 993e3e9144 am: c616681e31 am: f7f030a72e by Chih-Hung Hsieh · 4 months ago

Send Rust logs to Logcat

Version Build 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 = "0.9"

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() {
            .with_min_level(Level::Trace) // limit log level
            .with_tag("mytag") // logs will show under mytag tag
            .with_filter( // configure messages for specific crate

    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() {

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.


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