1## Send Rust logs to Logcat 2 3[](https://crates.io/crates/android_logger) 4[](https://github.com/Nercury/android_logger-rs/actions/workflows/ci.yml/) 5 6 7This library is a drop-in replacement for `env_logger`. Instead, it outputs messages to 8android's logcat. 9 10This only works on Android and requires linking to `log` which 11is only available under android. With Cargo, it is possible to conditionally require 12this library: 13 14```toml 15[target.'cfg(target_os = "android")'.dependencies] 16android_logger = "0.10" 17``` 18 19Example of initialization on activity creation, with log configuration: 20 21```rust 22#[macro_use] extern crate log; 23extern crate android_logger; 24 25use log::Level; 26use android_logger::{Config,FilterBuilder}; 27 28fn native_activity_create() { 29 android_logger::init_once( 30 Config::default() 31 .with_min_level(Level::Trace) // limit log level 32 .with_tag("mytag") // logs will show under mytag tag 33 .with_filter( // configure messages for specific crate 34 FilterBuilder::new() 35 .parse("debug,hello::crate=error") 36 .build()) 37 ); 38 39 trace!("this is a verbose {}", "message"); 40 error!("this is printed by default"); 41} 42``` 43 44To allow all logs, use the default configuration with min level Trace: 45 46```rust 47#[macro_use] extern crate log; 48extern crate android_logger; 49 50use log::Level; 51use android_logger::Config; 52 53fn native_activity_create() { 54 android_logger::init_once( 55 Config::default().with_min_level(Level::Trace)); 56} 57``` 58 59There is a caveat that this library can only be initialized once 60(hence the `init_once` function name). However, Android native activity can be 61re-created every time the screen is rotated, resulting in multiple initialization calls. 62Therefore this library will only log a warning for subsequent `init_once` calls. 63 64This library ensures that logged messages do not overflow Android log message limits 65by efficiently splitting messages into chunks. 66 67## License 68 69Licensed under either of 70 71 * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0) 72 * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT) 73 74at your option. 75 76### Contribution 77 78Unless you explicitly state otherwise, any contribution intentionally 79submitted for inclusion in the work by you, as defined in the Apache-2.0 80license, shall be dual licensed as above, without any additional terms or 81conditions. 82
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