New Flutter Android Project on Linux

Overview

1. flutter create --platforms=android -a kotlin project_name
2. in theta-client/flutter, copy android, lib, pubspec.yaml into project_name/theta_client_flutter
3. in theta-client/kotlin-multiplatform/build/outputs, copy *.aar into project_name/packages/theta_client_flutter/android/aar
4. in pubspec.yaml, under dependencies, add theta_client_flutter
5. in android/app/build.gradle, set minSdkVersion to 26
6. in android/build.gradle, add mavenLocal() under repositories

create new project

flutter create --platforms=android -a kotlin theta_mini
Creating project theta_mini...
cd theta_mini/
mkdir packages
mkdir packages/theta_client_flutter

copy theta-client package

add theta-client to android

Copy the .aar files theta-client/kotlin-multiplatform/build/outputs that were built in the theta-client package build step into packages/theta_client_flutter/android/aar.

This is what the aar files look like in VS Code.

configure Flutter

In pubspec.yaml, add the theta-client package as a dependency.

dependencies:
  flutter:
    sdk: flutter
  theta_client_flutter:
    path: ./packages/theta_client_flutter

configure android/app/build.gradle

With theta-client version from April 27, 2023.

In android/app/build.gradle, make the following changes.

if (flutterRoot == null) {
    throw new FileNotFoundException("Flutter not found. Add flutter.sdk in local.properties.")
}
...
...
defaultConfig {
    applicationId "com.oppkey.theta_mini"
    minSdkVersion 26
}    

add mavenLocal to android/build.gradle

allprojects {
    repositories {
        mavenLocal()
        google()
        mavenCentral()
    }
}

Test Flutter App

import 'package:flutter/material.dart';
import 'package:theta_client_flutter/theta_client_flutter.dart';

void main() {
  runApp(
    MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('theta-client minimal'),
        ),
        body: const MiniApp(),
      ),
    ),
  );
}

class MiniApp extends StatefulWidget {
  const MiniApp({Key? key}) : super(key: key);

  @override
  State<MiniApp> createState() => _MiniAppState();
}

class _MiniAppState extends State<MiniApp> {
  final _thetaClient = ThetaClientFlutter();
  String _mobilePlatform = 'device unknown';
  String _cameraInfo = 'unable to get camera info';

  @override
  void initState() {
    super.initState();
    _initializeTheta();
  }

  void _initializeTheta() async {
    try {
      var mobilePlatform = await _thetaClient.getPlatformVersion();
      await _thetaClient.initialize();
      var thetaInfo = await _thetaClient.getThetaInfo();
      setState(() {
        _mobilePlatform = mobilePlatform ?? 'device unknown';
        _cameraInfo = '${thetaInfo.model}, FW ${thetaInfo.firmwareVersion},'
            'SN: ${thetaInfo.serialNumber}';
      });
    } catch (error) {
      debugPrint(error.toString());
    }
  }

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.all(20.0),
      child: Column(
        mainAxisAlignment: MainAxisAlignment.start,
        children: [
          Text(
            'Mobile Platform: $_mobilePlatform',
            style: const TextStyle(fontSize: 36),
          ),
          const SizedBox(
            height: 40.0,
          ),
          Text(
            _cameraInfo,
            style: const TextStyle(fontSize: 36),
          )
        ],
      ),
    );
  }
}

Example Code for Minimal Project

• theta_client_minimal

Troubleshooting

If the build fails, make sure you have the aar files accessible in packages/theta_client_flutter/android/aar

Launching lib/main.dart on sdk gphone64 x86 64 in debug mode...
main.dart:1

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:checkDebugAarMetadata'.
> Could not resolve all files for configuration ':app:debugRuntimeClasspath'.
   > Failed to transform theta-client-debug.aar to match attributes {artifactType=android-aar-metadata}.