File > Sync Project with Gradle Files

flutter create -t module --org com.example flutter_module

flutter build aar

    android {
      buildTypes {
        // ...
        profile {
          initWith debug
        }
      }
    }

    dependencies {
      // ...
      debugImplementation 'com.example.flutter_module:flutter_debug:1.0'
      profileImplementation 'com.example.flutter_module:flutter_profile:1.0'
      releaseImplementation 'com.example.flutter_module:flutter_release:1.0'
    }

      repositories {
        // ...
        maven {
            url '../flutter_module/build/host/outputs/repo'
        }
        maven {
            url "https://storage.googleapis.com/download.flutter.io"
        }
      }

 <activity
   android:name="io.flutter.embedding.android.FlutterActivity"
   android:theme="@style/LaunchTheme"
   android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
   android:hardwareAccelerated="true"
   android:windowSoftInputMode="adjustResize"
   />

   import io.flutter.embedding.android.FlutterActivity

 myButton.setOnClickListener {
   startActivity(
     FlutterActivity.createDefaultIntent(this)
   )
 }

 myButton.setOnClickListener {
   startActivity(
     FlutterActivity
       .withNewEngine()
       .initialRoute("/my_route")
       .build(this)
   )
 }