conrod-android-skeleton's Introduction

Conrod Android skeleton

This repository provides a simple example of using the Conrod Rust GUI library (part of the Piston project) on Android.

It displays all the Conrod UI widgets using OpenGL. This repository contains no Java!

Requirements

rustup
the Android SDK at $ANDROID_HOME
a JDK (only tested with 8)
Gradle
the following Android SDK packages:
- ndk-bundle (and set $NDK_HOME to point to it)
- platform-tools
- platforms;android-18
- build-tools;26.0.1

Quick start

rustup target add arm-linux-androideabi
cargo install cargo-apk
git clone https://github.com/jbg/conrod-android-skeleton && cd conrod-android-skeleton
cargo apk build
adb install -r target/android-artifacts/app/build/outputs/apk/app-debug.apk
# launch the app on your device!

Project outline

The Conrod & Glium setup code, event loop, render thread, etc are in main.rs. The code to lay out the GUI is in app.rs. Assets are loaded from the APK in assets.rs.

Issues

This project currently depends on my own fork of Conrod (containing just one patch), due to an issue with rendering on OpenGL ES.

Everything is much smaller than it should be, possibly due to a DPI bug (see the end of the conversation in this issue).

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conrod-android-skeleton's Issues

build errors in 2023

I tried to build this repo on a modern-ish system

$ cargo apk build
Using package `conrod-android-skeleton` in `/home/thoth/vendor/conrod-android-skeleton/Cargo.toml`
    Updating crates.io index
    Updating git repository `https://github.com/jbg/conrod`
    Updating git repository `https://github.com/jbg/glium`
error: failed to get `glium` as a dependency of package `conrod v0.54.0 (https://github.com/jbg/conrod#284c0c3a)`
    ... which satisfies git dependency `conrod` of package `conrod-android-skeleton v0.1.0 (/home/thoth/vendor/conrod-android-skeleton)`

Caused by:
  no matching package for override `https://github.com/rust-lang/crates.io-index#[email protected]` found
  location searched: https://github.com/jbg/glium
  version required: =0.17.0
Error: Command `cargo build --target aarch64-linux-android` had a non-zero exit code.

so i commented out the [replace] clause in the hopes that it would fix things...

I think the APIs have drifted in the past 6 years:

error[E0432]: unresolved import `rusttype::FontCollection`
 --> src/assets.rs:3:22
  |
3 | use rusttype::{Font, FontCollection};
  |                      ^^^^^^^^^^^^^^ no `FontCollection` in the root
  |
  = help: consider importing this type alias instead:
          conrod::text::FontCollection

error[E0308]: mismatched types
   --> src/main.rs:21:21
    |
21  |     ui.fonts.insert(assets::load_font("LiberationSans-Regular.ttf"));
    |              ------ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `rusttype::Font<'static>`, found `Font<'_>`
    |              |
    |              arguments to this method are incorrect
    |

and a great many others.

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