Rust Libraries

You use rust_library to create a new Rust library for Android.

Here we declare a dependency on two libraries:

• libgreeting, which we define below,
• libtextwrap, which is a crate already vendored in external/rust/android-crates-io/crates/.

hello_rust/Android.bp:

{{#include library/Android.bp}}

hello_rust/src/main.rs:

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

hello_rust/src/lib.rs:

# // Copyright 2022 Google LLC
# // SPDX-License-Identifier: Apache-2.0
#
{{#include library/src/lib.rs:greeting}}

You build, push, and run the binary like before:

{{#include ../build_all.sh:hello_rust_with_dep}}

Hello Bob, it is very
nice to meet you!

• Go through the build steps and demonstrate them running in your emulator.

• A Rust crate named greetings must be built by a rule called libgreetings. Note how the Rust code uses the crate name, as is normal in Rust.

• Again, the build rules enforce that we add documentation comments to all public items.