Flutter是否支持Dynamic Delivery？基于Flutter如何实现该功能？

Absolutely! Flutter apps do support Dynamic Delivery via Android App Bundles (AAB) — this is a fully supported workflow for Android-targeted Flutter apps. Let’s walk through how to make it work, step by step:

Short answer: Yes. Flutter’s default build pipeline supports generating Android App Bundles, which is the prerequisite for Google Play’s Dynamic Delivery system. This means you can leverage features like on-demand module delivery, feature-based APK splitting, and language/device-specific asset delivery just like native Android apps.

1. Start with the Android App Bundle #

First, make sure you’re building an AAB instead of a universal APK. Flutter makes this easy:

• Run the command:

  flutter build appbundle
  

This generates an AAB in build/app/outputs/bundle/release/ — this file is what you’ll upload to Google Play to enable Dynamic Delivery.

2. Add a Dynamic Feature Module #

Dynamic Delivery relies on splitting your app into modules. Since this is an Android-specific feature, you’ll need to configure this in the Android portion of your Flutter project:

• Open your Flutter project in Android Studio, right-click the android/app module > New > Module
• Select Dynamic Feature Module from the list, then follow the wizard:
  • Name your module (e.g., dynamic_payments or advanced_features)
  • Choose the module type (e.g., "Feature module with empty activity" if you’re adding native UI, or "Empty dynamic feature module" for assets/libraries)
  • Link it to your main app module
• In your dynamic module’s build.gradle file, add dependencies for the Play Core library (required for module loading) and Flutter:

  dependencies {
      implementation project(':app')
      implementation 'com.google.android.play:core:1.10.3' // Use the latest version
      implementation flutterDependencies
  }
  

3. Connect Flutter to Dynamic Module Loading #

Since Flutter runs on a separate thread, you’ll use a MethodChannel to call Android native code that handles module installation:

Android Native Side (Kotlin) #

In your MainActivity.kt, set up the channel to handle module load requests:

import com.google.android.play.core.splitinstall.SplitInstallManagerFactory
import com.google.android.play.core.splitinstall.SplitInstallRequest
import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.plugin.common.MethodChannel

class MainActivity : FlutterActivity() {
    private val CHANNEL = "your.app.package/dynamic_module"

    override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
        super.configureFlutterEngine(flutterEngine)
        MethodChannel(flutterEngine.dartExecutor.binaryMessenger, CHANNEL).setMethodCallHandler { call, result ->
            when (call.method) {
                "loadModule" -> {
                    val moduleName = call.argument<String>("moduleName") ?: run {
                        result.error("INVALID_ARG", "Module name cannot be null", null)
                        return@setMethodCallHandler
                    }

                    val splitInstallManager = SplitInstallManagerFactory.create(this)
                    val request = SplitInstallRequest.newBuilder()
                        .addModule(moduleName)
                        .build()

                    splitInstallManager.startInstall(request)
                        .addOnSuccessListener { result.success("Module $moduleName loaded successfully") }
                        .addOnFailureListener { result.error("LOAD_FAILED", it.message, null) }
                }
                else -> result.notImplemented()
            }
        }
    }
}

Flutter Side (Dart) #

Create a helper class to invoke the native method:

import 'package:flutter/services.dart';

class DynamicModuleLoader {
  static const _channel = MethodChannel('your.app.package/dynamic_module');

  static Future<String?> loadModule(String moduleName) async {
    try {
      return await _channel.invokeMethod('loadModule', {'moduleName': moduleName});
    } on PlatformException catch (e) {
      return 'Error loading module: ${e.message}';
    }
  }
}

You can call this from your Flutter UI (e.g., a button press) to trigger on-demand module loading.

4. Test the Workflow #

• Local Testing: Use Android Studio’s App Bundle Explorer to inspect your AAB and generate device-specific APKs. You can also use bundletool to install split APKs directly:

  bundletool build-apks --bundle=build/app/outputs/bundle/release/app-release.aab --output=app.apks
  bundletool install-apks --apks=app.apks
  

• Play Store Testing: For full on-demand delivery testing, upload your AAB to Google Play’s internal testing channel and install it via the Play Store app — this replicates the real-world user experience.

Key Considerations #

• Dynamic Flutter Code: If you want to dynamically load Dart code (not just native modules), you’ll need additional tools like Flutter’s Module Federation or third-party code-splitting libraries. Android’s Dynamic Delivery handles native modules/assets, while Flutter’s own tools manage Dart code splitting.
• Play Core Updates: Always use the latest version of the Play Core library to avoid compatibility issues with newer Android versions.
• Module Constraints: Dynamic modules can’t contain components required by your main app (e.g., launch activities). Stick to optional features, assets, or libraries.

内容的提问来源于stack exchange，提问作者Prasanth PK