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现有Android工程接入flutter module

新建Flutter module

$ flutter create -t module my_flutter

集成到现有工程

以module引用的方式集成

// MyApp/settings.gradleinclude ':app'                                     // assumed existing contentsetBinding(new Binding([gradle: this]))                                 // newevaluate(new File(                                                      // new  settingsDir.parentFile,                                               // new  'my_flutter/.android/include_flutter.groovy'                          // new))

dependencies {  implementation project(':flutter')}

以aar文件的方式集成

在Flutter module的.android目录中打包aar

$ cd .android/$ ./gradlew flutter:assembleDebug

$ flutter clean$ flutter run

引用这个aar

repositories {    flatDir {        dirs 'libs'    }}

implementation name: 'flutter-debug', ext: 'aar'

A/flutter: [FATAL:flutter/fml/icu_util.cc(95)] Check failed: context->IsValid(). Must be able to initialize the ICU context. Tried: /data/user/0/com.example.androidwithflutter3/app_flutter/icudtl.datA/libc: Fatal signal 6 (SIGABRT), code -6 in tid 21199 (oidwithflutter3)

以远程仓库aar的方式集成

宿主端调用

public class FlutterViewActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        View flutterView = Flutter.createView(                FlutterViewActivity.this,                getLifecycle(),                "route"        );        setContentView(flutterView);    }}

public class FlutterFragmentActivity extends FragmentActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_fm);        getSupportFragmentManager()                .beginTransaction()                .add(R.id.fragment_container, Flutter.createFragment("route"))                .commit();    }}

void main() => runApp(_widgetForRoute(window.defaultRouteName));Widget _widgetForRoute(String route) {  switch (route) {    case 'demo_app':      return MyApp();    case 'version':      return VersionPage();    default:      return ErrorPage('Unknown route: $route');  }}

Flutter Plugin

新建Flutter Plugin

Plugin的平台侧分析

@Overridepublic void onMethodCall(MethodCall call, Result result) {    if (call.method.equals(GET_PLATFORM_VERSION)) {        result.success("Android " + android.os.Build.VERSION.RELEASE);    } else if (call.method.equals(GET_SDK_INT)) {        result.success("Android SDK: " + android.os.Build.VERSION.SDK_INT);    } else {        result.notImplemented();    }}

public static void registerWith(Registrar registrar) {    final MethodChannel channel = new MethodChannel(registrar.messenger(), PLUGIN_NAME);    channel.setMethodCallHandler(new FlutterPlugin());}

protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    GeneratedPluginRegistrant.registerWith(this);}

public final class GeneratedPluginRegistrant {  public static void registerWith(PluginRegistry registry) {    if (alreadyRegisteredWith(registry)) {      return;    }    FlutterPlugin.registerWith(registry.registrarFor("com.jeremyliao.flutterplugin.FlutterPlugin"));  }  private static boolean alreadyRegisteredWith(PluginRegistry registry) {    final String key = GeneratedPluginRegistrant.class.getCanonicalName();    if (registry.hasPlugin(key)) {      return true;    }    registry.registrarFor(key);    return false;  }}

Plugin的flutter侧分析

class FlutterPlugin {  static const MethodChannel _channel = const MethodChannel('flutter_plugin');  static Future<String> get platformVersion async {    final String version = await _channel.invokeMethod('getPlatformVersion');    return version;  }  static Future<String> get sdkInt async {    final String version = await _channel.invokeMethod('getSdkInt');    return version;  }}

发布

flutter packages pub publish --dry-run

flutter packages pub publish

在flutter工程中引用插件

引用发布的库

dependencies:  url_launcher: ^0.4.2

引用未发布的库

基于Path的引用

dependencies:  flutter_plugin:    path: ../

基于Git的引用方式

dependencies:  flutter_plugin:    git:      url: git://github.com/flutter/packages.git      path: packages/package1

在flutter层调用

Future<void> initPlatformState() async {    ...    try {        platformVersion = await FlutterPlugin.platformVersion;    } on PlatformException {        platformVersion = 'Failed to get platform version.';    }    ...}