一、
1、用androidstudio,在file->new->new module->flutter module
建议放在安卓项目的同级文件夹里，androidstudio会自动配置flutter模块，要注意的是在安卓项目的settings.gradle里include的必须是“app”！如下图
图片.png
2、用终端创建 Flutter modul（集成到原生项目）不推荐
flutter create --template module my_flutter
二、在安卓app的build gradle的android {}中添加代码
图片.png
compileOptions {
sourceCompatibility 1.8
targetCompatibility 1.8
}
//可酌情添加
defaultConfig {
ndk {
// Filter for architectures supported by Flutter.
abiFilters 'armeabi-v7a', 'arm64-v8a', 'x86_64'
}
}
//dependencies {}引入头文件
implementation project(':flutter')
三、添加组件
在AndroidManifest.xml的<application中
android:name="io.flutter.embedding.android.FlutterActivity"
android:theme="@style/Theme.AppCompat.NoActionBar"
android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
android:hardwareAccelerated="true"
android:windowSoftInputMode="adjustResize"
/>
四、最重要的交互来了，在需要跳转的界面中做交互（文档上在MainActivity.java中交互，那样数据还需要传，麻烦）
引入头文件
import io.flutter.embedding.android.FlutterActivity;
//预加载flutterEngine，跳转时候不白屏
//flutter与原生回调
public void jumpflutterPlugn ()
{
flutterEngine = new FlutterEngine(this);
flutterEngine.getDartExecutor().executeDartEntrypoint(
DartExecutor.DartEntrypoint.createDefault()
);
FlutterEngineCache
.getInstance()
.put("my_engine_id", flutterEngine);
//MethodChannel关联flutterEngine，好做回调
channel = new MethodChannel(flutterEngine.getDartExecutor().getBinaryMessenger(),CHANNEL);
channel.setMethodCallHandler( (call, result) -> {
if (call.method.equals("iOSFlutter2"))
{
//安卓通过回调的方式，往flutter
传递参数，注意⚠️参数类型只能是字符串
//解决问题[ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: MissingPluginException(No implementation found for method iOSFlutterQiantui on channel wg/native_get
String jsonString = GsonUtil.GsonString(suoyoudict);
result.success(jsonString);
}else if (call.method.equals("iOSFlutterCunChuDanJu")) {
//flutter回调传参
Map<String,Object> danjudict = new HashMap();
danjudict=call.arguments();
handleSKD(danjudict);
}
});
}
在此遇到诸多问题以及解决方式或者链接我挑选了一部分写在末尾，给后来者做参考
1、AndroidX的问题：集成flutter_module报错，找不到符号，AndroidX兼容问题如何解决？
gradle.properties中
android.useAndroidX=true
android.enableJetifier=true
https://coding.imooc.com/learn/questiondetail/131836.html
2、flutter降低版本禁用AndroidX方式
https://www.sohu.com/a/336423659_671494
3、解决annotations-13.0.jar包重复问题
//在安卓app的build gradle的android {}中添加代码
configurations {
cleanedAnnotations
compile.exclude group: 'org.jetbrains' , module:'annotations'
}
4、空安全问题。最好是做好空安全的处理，去除掉没有适配空安全的第三方插件，再在自己的flutter代码里适配空安全，很简单，按照提示来就行。当然如果嫌麻烦的话，可以试试下面命令
flutter run --no-sound-null-safety
