Bug: 159321223

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  1. 2216d73 Merge "Update TEST_MAPPING" am: 30481850bd am: e5e036f422 by Treehugger Robot · 9 weeks ago master
  2. e5e036f Merge "Update TEST_MAPPING" am: 30481850bd by Treehugger Robot · 9 weeks ago
  3. 3048185 Merge "Update TEST_MAPPING" by Treehugger Robot · 9 weeks ago
  4. 6053e18 Update TEST_MAPPING by Matthew Maurer · 9 weeks ago
  5. 68faafe Update TEST_MAPPING am: 13084cd9ce am: 26dd930241 by Matthew Maurer · 3 months ago

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() {
            .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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