Build Flutter App for Embedded Linux

Flutter SDK

git clone https://github.com/sony/flutter-elinux.git
sudo mv flutter-elinux /opt/
export PATH=$PATH:/opt/flutter-elinux/bin:/opt/flutter-elinux/flutter/bin

Create Flutter Example Hello World

. /opt/poky/4.0.15/environment-setup-cortexa53-crypto-poky-linux
flutter-elinux create helloworld
cd helloworld
flutter-elinux build elinux --debug --target-arch=arm64 \
     --target-compiler-triple=aarch64-poky-linux \
     --target-sysroot=/opt/poky/4.0.15/sysroots/cortexa53-crypto-poky-linux

file build/elinux/arm64/debug/bundle/helloworld 
build/elinux/arm64/debug/bundle/helloworld: ELF 64-bit LSB pie executable, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, for GNU/Linux 3.14.0, with debug_info, not stripped

Enable Flutter Custom Devices

$HOME/.flutter_custom_devices.json

{
  "custom-devices": [
    {
      "id": "roc-rk3328-cc",
      "label": "ROC-RK3328-CC",
      "sdkNameAndVersion": "yocto with flutter",
      "enabled": true,
      "platform": "arm64",
      "backend": "wayland",
      "ping": [
        "ping",
        "-c",
        "1",
        "-w",
        "1",
        "192.168.1.82"
      ],
      "pingSuccessRegex": "ttl=",
      "postBuild": null,
      "install": [
        "scp",
        "-r",
        "-o",
        "BatchMode=yes",
        "${localPath}",
        "root@192.168.1.82:/tmp/${appName}"
      ],
      "uninstall": [
        "ssh",
        "-o",
        "BatchMode=yes",
        "root@192.168.1.82",
        "rm -rf \"/tmp/${appName}\""
      ],
      "runDebug": [
        "ssh",
        "-o",
        "BatchMode=yes",
        "root@192.168.1.82",
        "export XDG_RUNTIME_DIR=/run/user/1001; /tmp/${appName}/${appName} -b ."
      ],
      "stopApp": [
        "ssh", "root@192.168.1.82",
        "ps aux | grep \"/tmp/${appName}\" | grep -v grep | awk '{print $2}' | xargs kill"
      ],
      "forwardPort": [
        "ssh",
        "-o",
        "BatchMode=yes",
        "-o",
        "ExitOnForwardFailure=yes",
        "-L",
        "127.0.0.1:${hostPort}:127.0.0.1:${devicePort}",
        "root@192.168.1.82",
        "echo 'Port forwarding success'; read"
      ],
      "forwardPortSuccessRegex": "Port forwarding success",
      "screenshot": null
    }
  ]
}

flutter-elinux devices
5 connected devices:

Linux (desktop)           • linux            • linux-x64      • Ubuntu 22.04.3 LTS 6.5.0-21-generic
eLinux (desktop)          • elinux-wayland   • flutter-tester • Ubuntu 22.04.3 LTS 6.5.0-21-generic
eLinux (desktop)          • elinux-x11       • flutter-tester • Ubuntu 22.04.3 LTS 6.5.0-21-generic
eLinux (mobile)           • roc-rk3328-cc    • flutter-tester • yocto with flutter

Remote Debugging

flutter-elinux run -d roc-rk3328-cc
Launching lib/main.dart on eLinux in debug mode...
Uninstall helloworld from roc-rk3328-cc.
Uninstallation Success
Install helloworld (build/elinux/arm64/debug/bundle) to roc-rk3328-cc
Installation Success
Launch helloworld.name on roc-rk3328-cc
Syncing files to device eLinux...                                  114ms

Flutter run key commands.
r Hot reload. 🔥🔥🔥
R Hot restart.
h List all available interactive commands.
d Detach (terminate "flutter run" but leave application running).
c Clear the screen
q Quit (terminate the application on the device).

A Dart VM Service on eLinux is available at: http://127.0.0.1:37679/mwcEpXRwu80=/
The Flutter DevTools debugger and profiler on eLinux is available at: http://127.0.0.1:9100?uri=http://127.0.0.1:37679/mwcEpXRwu80=/

Type h for all available commands, type v to open flutter devtools.

Flutter run key commands.
r Hot reload. 🔥🔥🔥
R Hot restart.
v Open Flutter DevTools.
w Dump widget hierarchy to the console.                                               (debugDumpApp)
t Dump rendering tree to the console.                                          (debugDumpRenderTree)
L Dump layer tree to the console.                                               (debugDumpLayerTree)
f Dump focus tree to the console.                                               (debugDumpFocusTree)
S Dump accessibility tree in traversal order.                                   (debugDumpSemantics)
U Dump accessibility tree in inverse hit test order.                            (debugDumpSemantics)
i Toggle widget inspector.                                  (WidgetsApp.showWidgetInspectorOverride)
p Toggle the display of construction lines.                                  (debugPaintSizeEnabled)
I Toggle oversized image inversion.                                     (debugInvertOversizedImages)
o Simulate different operating systems.                                      (defaultTargetPlatform)
b Toggle platform brightness (dark and light mode).                        (debugBrightnessOverride)
P Toggle performance overlay.                                    (WidgetsApp.showPerformanceOverlay)
a Toggle timeline events for all widget build methods.                    (debugProfileWidgetBuilds)
M Write SkSL shaders to a unique file in the project directory.
g Run source code generators.
j Dump frame raster stats for the current frame. (Unsupported for web)
h Repeat this help message.
d Detach (terminate "flutter run" but leave application running).
c Clear the screen
q Quit (terminate the application on the device).

A Dart VM Service on eLinux is available at: http://127.0.0.1:43639/dIT2DPYXz8I=/
The Flutter DevTools debugger and profiler on eLinux is available at: http://127.0.0.1:9100?uri=http://127.0.0.1:37679/mwcEpXRwu80=/

Launching Flutter DevTools for eLinux at http://127.0.0.1:9100?uri=http%3A%2F%2F127.0.0.1%3A37679%2F%mwcEpXRwu803D%2F