Logging

You should use the log crate to automatically log to logcat (on-device) or stdout (on-host):

hello_rust_logs/Android.bp:

javascript

{{#include logging/Android.bp}}

hello_rust_logs/src/main.rs:

rust,ignore

# // Copyright 2022 Google LLC
# // SPDX-License-Identifier: Apache-2.0
#
{{#include logging/src/main.rs:main}}

Build, push, and run the binary on your device:

shell

{{#include build_all.sh:hello_rust_logs}}

The logs show up in adb logcat:

shell

adb logcat -s rust

text

09-08 08:38:32.454  2420  2420 D rust: hello_rust_logs: Starting program.
09-08 08:38:32.454  2420  2420 I rust: hello_rust_logs: Things are going fine.
09-08 08:38:32.454  2420  2420 E rust: hello_rust_logs: Something went wrong!

The logger implementation in liblogger is only needed in the final binary, if you're logging from a library you only need the log facade crate.

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